ORCID Profile
0000-0002-1298-4743
Current Organisation
Australian National University
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Publisher: IEEE
Date: 06-2018
Publisher: IEEE
Date: 06-2018
Publisher: Wiley
Date: 04-04-2017
Publisher: Wiley
Date: 14-09-2018
Publisher: Wiley
Date: 20-10-2021
DOI: 10.1002/PIP.3498
Abstract: Hybrid organic–inorganic perovskite solar cells (PSCs) are one of the most promising candidates for next generation photovoltaics. Further improvement in their performance, particularly efficiency, durability and reproducibility, requires a deep understanding of recombination losses during fabrication and within a device itself. In this work, we report a contactless, imaging‐based procedure to spatially resolve electronic properties of PSCs including implied open‐circuit voltage ( iV oc ) and its temperature coefficient, ideality factor ( n id ) and activation energy of recombination ( E A ) by employing illumination intensity and temperature‐dependent photoluminescence. The illumination intensity dependence of iV oc allows the extraction of n id whereas its temperature dependence allows the extraction of the temperature coefficient and E A . This imaging approach is then applied to investigate changes of these electronic parameters on fully and partially fabricated devices.
Publisher: Wiley
Date: 31-01-2020
Publisher: Wiley
Date: 08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1MA00976A
Abstract: Mixed-dimensional 2D/3D perovskite-based NO 2 gas sensors were developed with swift response, great sensitivity and good selectivity. The 2D/3D devices have significantly better moisture stability than the 3D devices.
Publisher: Wiley
Date: 08-08-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA05699A
Abstract: Bromide-containing long alkylammonium chain organic cations effectly passivate defects on 1.72 eV perovskite film surfaces and greatly enhance both the performance and stability of perovskite solar cells.
Publisher: American Chemical Society (ACS)
Date: 17-09-2018
Publisher: Wiley
Date: 17-11-2020
Abstract: Dimensional engineering of perovskite solar cells has attracted significant research attention recently because of the potential to improve both device performance and stability. Here, a novel 2D passivation scheme for 3D perovskite solar cells is demonstrated using a mixed cation composition of 2D perovskite based on two different isomers of butylammonium iodide. The dual‐cation 2D perovskite outperforms its single cation 2D counterparts in surface passivation quality, resulting in devices with an impressive open‐circuit voltage of 1.21 V for a perovskite composition with an optical bandgap of ≈1.6 eV, and a ch ion efficiency of 23.27%. Using a combination of surface elemental analysis and valence electron spectra decomposition, it is shown that an in situ interaction between the 2D perovskite precursor and the 3D active layer results in surface intermixing of 3D and 2D perovskite phases, providing an effective combination of defect passivation and enhanced charge transfer, despite the semi‐insulating nature of the 2D perovskite phase. The demonstration of the synergistic interaction of multiple organic spacer cations in a 2D passivation layer offers new opportunities for further enhancement of device performance with mixed dimensional perovskite solar cells.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 07-12-2018
Abstract: A minimalist approach to integration yields tandem solar cells with high efficiency.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-01-2021
Abstract: In perovskite solar cells, the insulating nature of passivation layers needed to boost open-circuit voltage also increases the series resistance of the cell and limits the fill factor. Most improvements in power conversion efficiency have come from higher open-circuit voltage, with most fill factor improvements reported for very small-area cells. Peng et al. used a nanostructured titanium oxide electron transport layer to boost the fill factor of larger-area cells (1 square centimeter) to 0.84 by creating local regions with high conductivity. Science , this issue p. 390
Publisher: IGI Global
Date: 2017
DOI: 10.4018/978-1-5225-1918-8.CH010
Abstract: This chapter examines the literature relating to information and communications technology (ICT) and management skills and capabilities relating to anywhere working. The workforce is becoming more global, and workers can work from anywhere and still be connected with colleagues and collaborators. Although ICT is an enabler of anywhere working, sustainable anywhere working requires specific management skills and capabilities. Globalization of work requires organizations to manage workers ranging from full-time employees through to freelancers working in different locations including a central office, co-working center, from home and other flexible options. The chapter concludes by proposing a research agenda and conceptual framework to identify the management skills and capabilities required to successfully manage anywhere working (other terms include telework and telecommuting). The proposed conceptual framework will inform researchers and managers on best practice for adopting sustainable anywhere working to achieve strategic business objectives.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2016
Publisher: Springer Science and Business Media LLC
Date: 26-01-2022
DOI: 10.1038/S41586-021-04216-5
Abstract: Owing to rapid development in their efficiency
Publisher: Wiley
Date: 06-05-2019
Abstract: One of the most fundamental parameters of any photovoltaic material is its quasi-Fermi level splitting (∆µ) under illumination. This quantity represents the maximum open-circuit voltage (V
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE02288C
Abstract: An innovative design for a monolithic perovskite/silicon tandem solar cell, featuring a mesoscopic perovskite top subcell and a high-temperature tolerant homojunction c-Si bottom subcell.
Publisher: American Chemical Society (ACS)
Date: 09-02-2017
Abstract: With rapid progress in recent years, organohalide perovskite solar cells (PSC) are promising candidates for a new generation of highly efficient thin-film photovoltaic technologies, for which up-scaling is an essential step toward commercialization. In this work, we propose a modified two-step method to deposit the CH
Publisher: Elsevier BV
Date: 09-2021
Publisher: American Chemical Society (ACS)
Date: 07-05-2018
Publisher: American Chemical Society (ACS)
Date: 25-06-2018
Abstract: Photoelectrolysis of water using solar energy into storable and environment-friendly chemical fuel in the form of hydrogen provides a potential solution to address the environmental concerns and fulfill future energy requirements in a sustainable manner. Achieving efficient and spontaneous hydrogen evolution in water using solar light as the only energy input is a highly desirable but a difficult target. In this work, we report perovskite solar cell integrated CdS-based photoanode for unbiased photoelectrochemical hydrogen evolution. An integrated tandem device consisting of mesoporous CdS/TiO
Publisher: American Chemical Society (ACS)
Date: 11-03-2020
Publisher: American Chemical Society (ACS)
Date: 08-10-2019
Publisher: Wiley
Date: 11-12-2020
Abstract: Instability in perovskite solar cells is the main challenge for the commercialization of this solar technology. Here, a contactless, nondestructive approach is reported to study degradation across perovskite and perovskite/silicon tandem solar cells. The technique employs spectrally and spatially resolved absorptivity at sub‐bandgap wavelengths of perovskite materials, extracted from their luminescence spectra. Parasitic absorption in other layers, carrier diffusion, and photon smearing phenomena are all demonstrated to have negligible effects on the extracted absorptivity. The absorptivity is demonstrated to reflect real degradation in the perovskite film and is much more robust and sensitive than its luminescence spectral peak position, representing its optical bandgap, and intensity. The technique is applied to study various common factors which induce and accelerate degradation in perovskite solar cells including air and heat exposure and light soaking. Finally, the technique is employed to extract the in idual absorptivity component from the perovskite layer in a monolithic perovskite/silicon tandem structure. The results demonstrate the value of this approach for monitoring degradation mechanisms in perovskite and perovskite/silicon tandem cells at early stages of degradation and various fabrication stages.
Publisher: Wiley
Date: 31-03-2021
Abstract: Perovskite solar cells are a potential game changer for the photovoltaics industry, courtesy of their facile fabrication and high efficiency. Despite this, commercialization is being held back by poor stability. To become economically feasible for commercial production, perovskite solar cells must meet or exceed industry standards for operational lifetime and reliability. In this regard, mixed dimensional 2D‐3D perovskite solar cells, incorporating long carbon‐chain organic spacer cations, have shown promising results, with enhancement in both device efficiency and stability. Dimensional engineering of perovskite films requires a delicate balance of 2D and 3D perovskite composition to take advantage of the specific properties of each material phase. This review summarizes and assesses the current understanding, and apparent contradictions in the state‐of‐the‐art mixed dimensional perovskite solar cell literature regarding the origin of stability and performance enhancement. By combining and comparing results from experimental and theoretical studies it is focused on how the perovskite composition, film formation methods, additive and solvent engineering influence efficiency and stability, and identify future research directions to further improve both key performance metrics.
Publisher: Wiley
Date: 24-07-2021
Abstract: While direct solar‐driven water splitting has been investigated as an important technology for low‐cost hydrogen production, the systems demonstrated so far either required expensive materials or presented low solar‐to‐hydrogen (STH) conversion efficiencies, both of which increase the levelized cost of hydrogen (LCOH). Here, a low‐cost material system is demonstrated, consisting of perovskite/Si tandem semiconductors and Ni‐based earth‐abundant catalysts for direct solar hydrogen generation. NiMo‐based hydrogen evolution reaction catalyst is reported, which has innovative “flower‐stem” morphology with enhanced reaction sites and presents very low reaction overpotential of 6 mV at 10 mA cm −2 . A perovskite solar cell with an unprecedented high open circuit voltage ( V oc ) of 1.271 V is developed, which is enabled by an optimized perovskite composition and an improved surface passivation. When the NiMo hydrogen evolution catalyst is wire‐connected with an optimally designed NiFe‐based oxygen evolution catalyst and a high‐performance perovskite‐Si tandem cell, the resulting integrated water splitting cell achieves a record 20% STH efficiency. Detailed analysis of the integrated system reveals that STH efficiencies of 25% can be achieved with realistic improvements in the perovskite cell and an LCOH below ≈ $3 kg −1 is feasible.
Publisher: American Chemical Society (ACS)
Date: 08-2017
Abstract: Perovskite material with a bandgap of 1.7-1.8 eV is highly desirable for the top cell in a tandem configuration with a lower bandgap bottom cell, such as a silicon cell. This can be achieved by alloying iodide and bromide anions, but light-induced phase-segregation phenomena are often observed in perovskite films of this kind, with implications for solar cell efficiency. Here, we investigate light-induced phase segregation inside quadruple-cation perovskite material in a complete cell structure and find that the magnitude of this phenomenon is dependent on the operating condition of the solar cell. Under short-circuit and even maximum power point conditions, phase segregation is found to be negligible compared to the magnitude of segregation under open-circuit conditions. In accordance with the finding, perovskite cells based on quadruple-cation perovskite with 1.73 eV bandgap retain 94% of the original efficiency after 12 h operation at the maximum power point, while the cell only retains 82% of the original efficiency after 12 h operation at the open-circuit condition. This result highlights the need to have standard methods including light/dark and bias condition for testing the stability of perovskite solar cells. Additionally, phase segregation is observed when the cell was forward biased at 1.2 V in the dark, which indicates that photoexcitation is not required to induce phase segregation.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2016
Publisher: Wiley
Date: 10-01-2023
Abstract: Methylammonium (MA)‐free perovskite solar cells have the potential for better thermal stability than their MA‐containing counterparts. However, the efficiency of MA‐free perovskite solar cells lags behind due to inferior bulk quality. In this work, 4‐methylphenethylammonium chloride (4M‐PEACl) is added into a MA‐free perovskite precursor, which results in greatly enhanced bulk quality. The perovskite crystal grains are significantly enlarged, and defects are suppressed by a factor of four upon the incorporation of an optimal concentration of 4M‐PEACl. Quasi‐2D perovskites are formed and passivate defects at the grain boundaries of the perovskite crystals. Furthermore, the perovskite surface chemistry is modified, resulting in surface energies more favorable for hole extraction. This facile approach leads to a steady state efficiency of 23.7% (24.2% in reverse scan, 23.0% in forward scan) for MA‐free perovskite solar cells. The devices also show excellent light stability, retaining more than 93% of the initial efficiency after 1000 h of constant illumination in a nitrogen environment. In addition, a four‐terminal mechanically stacked perovskite‐silicon tandem solar cell with ch ion efficiency of 30.3% is obtained using this MA‐free composition. The encapsulated tandem devices show excellent operational stability, retaining more than 98% of the initial performance after 42 day/night cycles in an ambient atmosphere.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9MH01744E
Abstract: Intensive bulk photovoltaic effects are produced in narrow-bandgap centrosymmetric materials by a new strategy based on polar nano-regions.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1SE01260F
Abstract: Si photocathode with industrially relevant charge selective passivation and physically deposited earth-abundant catalyst is developed with an efficiency above 10%. Solar-to-hydrogen efficiency of 17% is achieved by combining perovskite PV in tandem.
Publisher: Wiley
Date: 09-06-2022
Abstract: The tandem cell structure is the most promising solution for the next generation photovoltaic technology to overcome the single‐junction Shockley–Queisser limit. The fabrication of a perovskite/c‐Si monolithic tandem device has not yet been demonstrated on a c‐Si bottom cell produced from an industrial production line. Here, a c‐Si cell with a tunneling oxide passivating contact (TOPCon) structure produced on a production line as the bottom cell of a tandem device, and a top cell featuring solution‐processed perovskite films to form the tandem device are used. The c‐Si cell features a rough damage etched, but untextured front surface from the wafering processes. To combat the challenge of rough surfaces, several strategies to avoid shunt paths across carrier transport layers, absorber layers, and their interfaces are implemented. Moreover, the origin of reflection loss on this planar structure is investigated and the reflection loss is managed to below 4 mA cm −2 . In addition, the source of the voltage loss from the TOPCon bottom cell is identified and the device structure is redesigned to be suitable for tandem applications while still using mass production feasible fabrication methods. Overall, 27.6% efficiency is achieved for a monolithic perovskite/c‐Si tandem device, with significant potential for future improvements.
Publisher: Wiley
Date: 15-06-2020
Publisher: Wiley
Date: 18-12-2020
Publisher: Wiley
Date: 06-06-2021
Abstract: Early prediction of spatially resolved performance of perovskite solar cells (PSCs) is essential for process monitoring, control and fault diagnosis, and upscaling of this emerging technology. Herein, a fast, nonde structive, contactless imaging‐based approach is developed to visualize the spatial distribution of possible light current density−voltage (pseudo‐ J−V ) curves on finished and partly finished cells. This allows for the extraction of other critical spatially resolved properties including implied open‐circuit voltage and pseudo‐fill factor. The technique is applied to systematically investigate various degradation behaviors on PSCs including thermal stability, light soaking, and ambient air exposure. Finally, it is used to predict pseudo‐ J−V curves of various perovskite films with different compositions. These results demonstrate the significant value of this fast imaging technique for the research and development of PSCs ranging from material selection, process optimization, to degradation study.
Publisher: Elsevier BV
Date: 12-2018
Publisher: Wiley
Date: 11-08-2021
Abstract: Dimensional engineering of perovskite films is a promising pathway to improve the efficiency and stability of perovskite solar cells (PSCs). In this context, surface or bulk passivation of defects in 3D perovskite film by careful introduction of 2D perovskite plays a key role. Here the authors demonstrate a 2D perovskite passivation scheme based on octylammonium chloride, and show that it provides both bulk and surface passivation of 1.6 eV bandgap 3D perovskite film for highly efficient (≈23.62%) PSCs with open‐circuit voltages up to 1.24 V. Surface and depth‐resolved microscopy and spectroscopy analysis reveal that the Cl − anion diffuses into the perovskite bulk, passivating defects, while the octylammonium ligands provide effective, localized surface passivation. The authors find that the Cl − diffusion into the perovskite lattice is independent of the 2D perovskite crystallization process and occurs rapidly during deposition of the 2D precursor solution. The annealing‐induced evaporation of Cl from bulk perovskite is also inhibited in 2D–3D perovskite film as compared to pristine 3D perovskite, ensuring effective bulk passivation in the relevant film.
Publisher: American Chemical Society (ACS)
Date: 05-06-2017
DOI: 10.1021/ACS.JPCLETT.7B00571
Abstract: J-V hysteresis in perovskite solar cells is known to be strongly dependent on many factors ranging from the cell structure to the preparation methods. Here we uncover one likely reason for such sensitivity by linking the stoichiometry in pure CH
Publisher: Elsevier BV
Date: 12-2016
Publisher: IEEE
Date: 06-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01096F
Abstract: Reducing interface recombination boosts the V oc for perovskite solar cells.
Publisher: Wiley
Date: 09-06-2022
Abstract: The key role of Cs cation and X halide anions (X = I, Br, Cl) on the microstructure, crystal structure, structural defects, optoelectronic properties, and photovoltaic parameters of FAPbI 3 ‐based perovskite solar cells is investigated. The CsCl–FAPbI 3 perovskite film shows the highest photoluminescence (PL) intensity, longest PL lifetime, and highest power conversion efficiency compared with the CsI–FAPbI 3 and CsBr–FAPbI 3 perovskite films. The morphology and crystallography of c nanotwins and stacking faults of perovskite films are studied using transmission electron microscopy and selected‐area electron diffraction. The microstructure, crystallography, and atomic structure model of intersecting twin boundaries are presented. Finally, the degradation pathways and the mechanism behind the formation of FAPbI 3 ‐based perovskites under ambient conditions are systematically studied. The grain boundaries of the perovskite films are nonuniformly damaged, resulting in many black nanoparticles after 4 weeks. Electron diffraction analyses of the black nanoparticles confirm the hexagonal PbI 2 phase formation in all CsX–FAPbI 3 perovskite s les after 4 weeks of aging.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CP03779H
Abstract: Confocal photoluminescence microscopy is applied to investigate the time and spatial characteristics of light-induced trap de-activation in CH 3 NH 3 PbI 3 perovskite films.
Publisher: Wiley
Date: 04-11-2016
Publisher: Frontiers Media SA
Date: 17-03-2020
Publisher: Wiley
Date: 18-09-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA02699B
Abstract: A defect-engineering strategy is reported to enhance the photovoltaic performance of BiNbO 4 . Synergetic effects: enhanced light absorption, ferroelectric-like depolarization and interfacial polarization on BiNbO 4 homojunction lead to an increase in the photovoltaic effects.
Publisher: Wiley
Date: 13-08-2023
Abstract: Perovskite solar cell technology offers a promising power option for space applications due to its potential properties of high power‐to‐weight ratios and space‐radiation tolerance. Herein, a new simulation‐based method is introduced to predict the degradation of perovskite solar cells under proton radiation. The approach uses ion scattering simulations to generate depth‐dependent defect profiles as a function of proton energy and fluence, which are then incorporated into optoelectronic simulations to predict the degradation. The method to study the impact of perovskite compositions on radiation tolerance is applied and an inorganic perovskite CsPbI 2 Br and an organic–inorganic perovskite FAMAPbI 3 is compared. The simulations predict that CsPbI 2 Br and FAMAPbI 3 cells retain 62% and 65% of their initial efficiencies after a 100 keV fluence of 1e14 cm −2 , respectively. For comparison, unshielded III–V solar cells display similar degradation for proton fluences 3–4 orders of magnitude lower. It is also shown that the radiation direction must be considered when interpreting and predicting radiation tolerance, as the spatial overlap between photogenerated carriers and radiation‐induced defects has a significant impact on cell performance. Finally, a method to predict mission end‐of‐life performance of perovskite cells is demonstrated, taking into account the full proton radiation energy spectrum and fluence and the incident direction.
Publisher: Informa UK Limited
Date: 24-01-2018
Publisher: Wiley
Date: 25-08-2017
Publisher: Wiley
Date: 10-12-2020
Abstract: The article commences with a review focusing on three critical aspects of the perovskite/Si tandem technology: the evolution of efficiencies to date, comparisons of Si subcell choices, and the interconnection design strategies. Building on this review, a clear route is provided for minimizing optical losses aided by optical simulations of a recently reported high‐efficiency perovskite/Si tandem system, optimizations which result in tandem current densities of ≈20 mAcm −2 with front‐side texture. The primary focus is on electrical modeling on the Si‐subcell, in order to understand the efficiency potential of this cell under filtered light in a tandem configuration. The possibility of increasing the Si subcell efficiency by 1% absolute is offered through joint improvements to the bulk lifetime, which exceeds 4 ms, and improves surface passivation quality to saturation current densities below 10 fA cm −2 . Polycrystalline‐Si/SiO x passivating contacts are proposed as a promising alternative to partial‐area rear contacts, with the potential for further simplifying cell fabrication and improving device performance. A combination of optical modeling of the complete tandem structure alongside electrical modeling of the Si‐subcell, both with state‐of‐the‐art modeling tools, provides the first complete picture of the practical efficiency potential of perovskite/Si tandems.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1EE01508G
Abstract: We present a dual passivation approach for p–i–n perovskite solar cells using phenethylammonium chloride that simultaneously passivates defects at the grain boundaries and the perovskite/C 60 interface, thus substantially enhancing both V OC and FF.
Publisher: Wiley
Date: 14-12-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA07005J
Abstract: Incorporating 2.5% Cs in FA 0.8 MA 0.2 Sn 0.5 Pb 0.5 I 3 improves the photo-stability of the low-bandgap perovskite solar cells. The ch ion device with power conversion efficiency of 18.9% maintain 92% of its initial efficiency after 120 min MPP tracking.
Publisher: Wiley
Date: 26-05-2022
Abstract: One of the important factors in the performance of perovskite solar cells (PSCs) is effective defect passivation. Dimensional engineering technique is a promising method to efficiently passivate non‐radiative recombination pathways in the bulk and surface of PSCs. Herein, a passivation approach for the perovskite/hole transport layer interface is presented, using a mixture of guanidinium and n‐octylammonium cations introduced via GuaBr and n‐OABr. The dual‐cation passivation layer can provide an open‐circuit voltage of 1.21 V with a power conversion efficiency of 23.13%, which is superior to their single cation counterparts. The mixed‐cation passivation layer forms a 1D/2D perovskite film on top of 3D perovskite, leading to a more hydrophobic and smoother surface than the uncoated film. A smooth surface can diminish non‐radiative recombination and enhance charge extraction at the interface making a better contact with the transport layer, resulting in improved short‐circuit current. In addition, space charge‐limited current measurements show a three times reduction in the trap‐filled limit voltage in the mixed‐cation passivated s le compared with unpassivated cells, indicating fewer trapped states. The shelf‐life stability test in ambient atmosphere with 60% relative humidity as well as light‐soaking stability reveal the highest stability for the dual‐cation surface passivation.
Publisher: American Chemical Society (ACS)
Date: 11-02-2015
DOI: 10.1021/ACS.JPCLETT.5B00044
Abstract: Spectrally resolved photoluminescence is used to measure the band-to-band absorption coefficient α(BB)(ℏω) of organic-inorganic hybrid perovskite methylammonium lead iodide (CH₃NH₃PbI₃) films from 675 to 1400 nm. Unlike other methods used to extract the absorption coefficient, photoluminescence is only affected by band-to-band absorption and is capable of detecting absorption events at very low energy levels. Absorption coefficients as low as 10⁻¹⁴ cm⁻¹ are detected at room temperature for long wavelengths, which is 14 orders of magnitude lower than reported values at shorter wavelengths. The temperature dependence of α(BB)(ℏω) is calculated from the photoluminescence spectra of CH₃NH₃PbI₃ in the temperature range 80-360 K. Based on the temperature-dependent α(BB)(ℏω), the product of the radiative recombination coefficient and square of the intrinsic carrier density, B(T) × n(i)², is also obtained.
Publisher: IOP Publishing
Date: 22-11-2016
DOI: 10.1088/0957-4484/27/50/505403
Abstract: We report methyl ammonium lead iodide (MAPbI
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7EE02627G
Abstract: A perovskite/CIGS tandem configuration is an attractive and viable approach to achieve an ultra-high efficiency and cost-effective all-thin-film solar cell.
Publisher: IEEE
Date: 06-2017
Location: Congo, Democratic Republic of the
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