ORCID Profile
0000-0001-5123-7364
Current Organisations
UNSW Sydney
,
University of Sydney
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Materials engineering | Nanomaterials | Functional materials | Photonics optoelectronics and optical communications |
Publisher: American Chemical Society (ACS)
Date: 24-01-2017
Publisher: Wiley
Date: 31-01-2020
Publisher: Springer Science and Business Media LLC
Date: 20-01-2021
DOI: 10.1038/S41467-020-20749-1
Abstract: All-inorganic CsPbI 3 perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. These quantum dot devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. We demonstrate higher mechanical endurance of quantum dot films compared to bulk thin film and highlight the importance of further research on high-performance and flexible optoelectronic devices using nanoscale grains as an advantage. Specifically, we develop a hybrid interfacial architecture consisting of CsPbI 3 quantum dot/PCBM heterojunction, enabling an energy cascade for efficient charge transfer and mechanical adhesion. The ch ion CsPbI 3 quantum dot solar cell has an efficiency of 15.1% (stabilized power output of 14.61%), which is among the highest report to date. Building on this strategy, we further demonstrate a highest efficiency of 12.3% in flexible quantum dot photovoltaics.
Publisher: Wiley
Date: 08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2EE04007G
Abstract: An ultra-thin indium tin oxide interlayer design was developed for interfacing perovskite solar cells with Si solar cells thereby minimising shunting effects for large area monolithic tandem devices.
Publisher: Trans Tech Publications, Ltd.
Date: 11-2015
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.833.39
Abstract: A novel blue-emitting phosphor NaBaBO 3 doped with Tm 3+ was prepared using a conventional high temperature solid-state reaction method. Its crystal structure and luminescence properties were studied. Photoluminescence measurements indicate that the phosphor features a satisfactory blue performance due to the 1 D 2 → 3 F 4 transition of Tm 3+ with the highest photoluminescence intensity located at 460 nm excited by 359 nm near-ultraviolet (NUV) light. In addition, the concentration of Tm 3+ was adjusted in order to obtain the optimum emission intensity. When the Tm 3+ concentration in NaBaBO 3 is 6.0 mol% the maximum intensity can be obtained. The concentration quenching occurs when Tm 3+ concentration is beyond 6.0 mol% and the concentration quenching mechanism can be explained by the dipole–dipole interaction. The measured chromaticity coordinate for the NaBaBO 3 :Tm 3+ phosphor under 359 nm excitation is determined to be (0.1470, 0.1090). The present work suggests that the NaBaBO 3 :Tm 3+ ,K + phosphor is a promising blue-emitting material for NUV white light-emitting diodes.
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: 02-2019
Abstract: Poor stability always restricts the application of all-inorganic perovskite quantum dots (PQDs). Herein, 2D hexagonal boron nitride ( h-BN) nanosheets were firstly utilized to stabilize CsPbBr
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CE00728D
Abstract: Improvements in charge carrier transport and equivalent photoluminescence were obtained for CuInS 2 nanoparticles with Ag-surface termination in photovoltaic devices.
Publisher: Wiley
Date: 16-08-2019
Publisher: Wiley
Date: 02-2019
Abstract: This paper provides deep understanding of the formation mechanism of perovskite film fabricated by sequential solution-based methods. It compares two sequential spin-coating methods for Cs
Publisher: American Chemical Society (ACS)
Date: 16-11-2023
Publisher: World Scientific Pub Co Pte Lt
Date: 08-2015
DOI: 10.1142/S1793604715500423
Abstract: Yellow emitting Sm 3+ -doped NaBa 1-x BO 3 (0.01 ≤ x ≤ 0.13) phosphors were synthesized by conventional solid state reaction method. The phase structure and luminescence properties of the as-prepared phosphors were investigated. These phosphors can be effectively excited by 403 nm near-ultraviolet light and feature a satisfactory yellow performance. The emission peaks are observed at 560 nm, 603 nm and 650 nm, originating from the transitions of 4 G 5∕2 → 6 H 5∕2 , 4 G 5∕2 → 6 H 7∕2 and 4 G 5∕2 → 6 H 9∕2 respectively. Investigation of Sm 3+ concentration-dependent emission spectra indicates that the NaBa 0.95 BO 3 :0.05 Sm 3+ phosphor shows the strongest yellow emission intensity and exhibits the CIE value of x = 0.4760 and y = 0.5090. Through the theoretical calculation, a high color purity of 96.0% was determined for the NaBaBO 3 : Sm 3+ phosphor, and the color purity of NaBaBO 3 : Sm 3+ is much higher than that of the commercial yellow phosphor YAG : Ce 3+ . This work is highly relevant to the development of a new type of potential down-conversion (DC) yellow phosphor for near ultraviolet white or yellow light-emitting diodes (LEDs).
Publisher: World Scientific Pub Co Pte Lt
Date: 04-2015
DOI: 10.1142/S1793604715500228
Abstract: A novel white-light-emitting Sr 3 B 2 O 6 : Dy 3+ phosphor was prepared by solid-state reactions and its luminescence properties were investigated. The excitation spectrum of obtained phosphor monitored at 479 nm covers a very broad spectral region from 320 nm to 460 nm with peaks at 323, 349, 363, 386, 427 and 456 nm. Under excitation at 349 nm, the phosphor exhibits a blue emission centered at 479 nm and a yellow emission centered at 574 nm. The optimal doping concentration of Dy 3+ is obtained to be 7 mol%, and the concentration quenching is observed when the concentration of Dy 3+ exceeds 7 mol%. This concentration quenching is due to the enhanced energy exchange among Dy 3+ ions. The CIE chromaticity coordinate (0.289, 0.302) of Sr 3-0.07 B 2 O 6 :0.07 Dy 3+ located in the white-light region can be achieved. Theoretical calculations of electronic properties for Sr 3 B 2 O 6 : Dy 3+ phosphor in the framework of the density functional theory (DFT) were carried out. Our results suggest that the Sr 3 B 2 O 6 : Dy 3+ phosphor is a promising single-component white-light-emitting material.
Publisher: Elsevier BV
Date: 04-2015
Publisher: American Chemical Society (ACS)
Date: 15-02-2021
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 08-2021
Publisher: IOP Publishing
Date: 02-2016
Publisher: Elsevier BV
Date: 2016
Publisher: American Chemical Society (ACS)
Date: 22-08-2016
Publisher: The Electrochemical Society
Date: 2015
DOI: 10.1149/2.0121505JSS
Publisher: American Chemical Society (ACS)
Date: 31-08-2017
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 2019
DOI: 10.2139/SSRN.3430705
Publisher: American Chemical Society (ACS)
Date: 09-08-2017
Publisher: American Chemical Society (ACS)
Date: 24-01-2018
Publisher: Elsevier BV
Date: 09-2015
Publisher: Wiley
Date: 23-01-2020
Publisher: Elsevier BV
Date: 09-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2019
Publisher: Springer Science and Business Media LLC
Date: 13-07-2020
Publisher: Trans Tech Publications, Ltd.
Date: 11-2015
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.833.122
Abstract: A YAG continue-wave laser has been used to refine the surface of silicon wafers in this study. During laser scanning, the irradiated region of the surface of the wafer experienced melting and subsequent recrystallization, which results in a redistribution of metal impurities in the molten pool along the depth direction. Cross-sectional micrographs of irradiated wafers have a clear boundary, which confirms the process of recrystallization, and the depth of molten region depends on the scanning parameters and the size of wafer. Secondary ion mass spectrometry measurements have been carried out to characterize the concentration of metal impurities. After redistribution of metal impurities, a final relative purity region was formed close to the surface. SIMS measurements demonstrate that the metal impurity concentration of the purity region has significantly reduced. The mechanism of the redistribution process of metal impurities in the molten pool has been qualitatively analyzed. All of the experimental results support that the CW laser scanning technology can effectively refine the specific surfaces of silicon wafers, and this technology has a great potential in the field of solar cells.
Publisher: Research Square Platform LLC
Date: 30-07-2020
DOI: 10.21203/RS.3.RS-47321/V1
Abstract: All-inorganic CsPbI3 perovskite quantum dots (QDs) have received intense research interest for photovoltaic applications because of the recently demonstrated higher power conversion efficiency compared to solar cells using other QD materials. These QD devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. In this work, through developing a hybrid interfacial architecture consisting of CsPbI3 QD/PCBM heterojunctions, we report the formation of an energy cascade for efficient charge transfer at both QD heterointerfaces and QD/electron transport layer interfaces. The ch ion CsPbI3 QD solar cell has a best power conversion efficiency of 15.1%, which is among the highest report to date. Building on this strategy, we demonstrate the very first perovskite QD flexible solar cell with a record efficiency of 12.3%. A detailed morphological characterization reveals that the perovskite QD film can better retain structure integrity than perovskite bulk thin-film under external mechanical stress. This work is the first to demonstrate higher mechanical endurance of QD film compared to bulk thin-film, and highlights the importance of further research on high‐performance and flexible optoelectronic devices using solution-processed QDs.
Publisher: Wiley
Date: 27-10-2021
DOI: 10.1002/PIP.3354
Publisher: AIP Publishing
Date: 15-10-2021
DOI: 10.1063/5.0061483
Abstract: Organic–inorganic metal halide perovskite solar cells represent the fastest advancing solar cell technology in terms of energy conversion efficiency improvement, as seen in the last decade. This has become a promising technology for next-generation, low-cost, high-efficiency photovoltaics including multi-junction tandem cell concepts. Double-junction tandem cells have much higher efficiency limits of 45%, beyond the Shockley–Queisser limits for a single-junction solar cell. In this review, recent progress with the perovskite tandem solar cells is highlighted, in particular, with 2-terminal perovskite–Si, perovskite–CIGS [where CIGS = Cu(In,Ga)(S,Se)2], perovskite–organic photovoltaic, perovskite–perovskite, and 3-junction-perovskite tandems. The opportunity and challenges of two-terminal monolithic perovskite tandems are discussed including a roadmap of strategies for further improving their efficiencies.
Publisher: Elsevier BV
Date: 12-2018
Publisher: American Chemical Society (ACS)
Date: 31-08-2018
Publisher: Elsevier BV
Date: 09-2019
Publisher: Technical Association of Photopolymers, Japan
Date: 24-06-2019
Publisher: American Chemical Society (ACS)
Date: 12-09-2019
DOI: 10.1021/ACS.JPCLETT.9B02423
Abstract: Colloidal quantum dot solids are attractive candidates for tandem solar cells because of their widely tunable bandgaps. However, the development of the quantum dot tandem solar cell has lagged far behind that of its single-junction counterpart. One of the fundamental problems with colloidal quantum dot solar cells is the relatively small diffusion length, which limits the quantum dot absorbing layer thickness and hence the power conversion efficiency. In this research, guided by optical modeling and utilizing a graded band alignment strategy, a two-terminal monolithic solution-processed quantum dot tandem solar cell has been successfully fabricated and a power conversion efficiency of 6.8% has been achieved. The band grading approach utilized the complementary tuning of work functions and band alignment through judicious choices of the nanoparticle surface chemistry and quantum dot confined size. This work demonstrates a general approach to improving the efficiency for tandem thin-film solar cells.
Publisher: Elsevier BV
Date: 06-2014
Publisher: Wiley
Date: 27-12-2018
Abstract: Hybrid halide perovskite is one of the promising light absorber and is intensively investigated for many optoelectronic applications. Here, the first prototype of a self-powered inorganic halides perovskite for chemical gas sensing at room temperature under visible-light irradiation is presented. These devices consist of porous network of CsPbBr
Publisher: Elsevier BV
Date: 04-2018
Publisher: World Scientific Pub Co Pte Lt
Date: 26-10-2015
DOI: 10.1142/S1793604715500770
Abstract: NaBa 0.97-x BO 3 0.03 Dy 3+ , x Eu 3+ (0 ≤ x ≤ 0.09) single-phase white phosphors with tunable correlated color temperature (CCT) were synthesized using a conventional solid state reaction method. The phase structure and luminescence properties of the as-prepared s les were investigated. The Dy 3+ , Eu 3+ doped and Dy 3+ / Eu 3+ co-doped NaBaBO 3 phosphors excited by 361 nm show two blue and yellow emissions corresponding to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions of Dy 3+ ions and two red emissions due to the 5 D 0 → 4 F J (J = 1, 2) transitions of Eu 3+ ions. Under 361-nm light excitation, the NaBa 0.97-x BO 3 0.03 Dy 3+ , x Eu 3+ (0 ≤ x ≤ 0.09) phosphors feature a white light emitting property. Through the Commission Internationale de L'Eclairage (CIE) chromaticity analysis and CCT calculation, the CIE chromaticity coordinates of the emission light are all located in the white region and can be tuned from bluish white light to reddish white light when the Eu 3+ concentration increases, and the CCT values of the obtained s les can vary from 5514.31 K to 8269.42 K. Furthermore, the energy transfer phenomenon from Dy 3+ ions to Eu 3+ ions in Dy 3+ / Eu 3+ co-doped s les was also investigated. The results indicated that, through tuning the Eu 3+ concentration of the NaBaBO 3 : Dy 3+ / Eu 3+ phosphors, the NaBaBO 3 -based phosphor can act as a potential single-phase white emitting phosphor for the application in the near-ultraviolet (NUV) white light emitting diodes.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TC02482J
Abstract: It is demonstrated that Sr 5 (PO 4 ) 3 Cl:Eu 2+ blue-emitting phosphor features good thermal ability, high color purity and is a suitable blue-emitting candidate for the application in near-UV w-LEDs.
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 08-2020
Publisher: American Chemical Society (ACS)
Date: 02-05-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA11154A
Abstract: Partial replacement of Pb in CsPbI 3 perovskite solar cells with Ca enhances power conversion efficiency to 13.5% under reverse scan (stabilised at 13.3%), without sacrificing stability.
Publisher: American Chemical Society (ACS)
Date: 19-04-2201
Abstract: CsPbBr
Publisher: American Chemical Society (ACS)
Date: 11-08-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CP03059J
Abstract: Halide perovskite materials are excellent light harvesters that have generated enormous interest for photovoltaic technology and an increasing number of other optoelectronic applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8EE00689J
Abstract: A simple and scalable interface-layer free monolithic perovskite/silicon tandem has been demonstrated achieving over 20% efficiency on a large area.
Publisher: Informa UK Limited
Date: 09-2016
DOI: 10.3130/JAABE.15.543
Publisher: Trans Tech Publications, Ltd.
Date: 07-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.1003.7
Abstract: A kind of red emitting phosphor, Sr 2 B 2 O 5 :Eu 3+ , Na + for white light-emitting diodes (W-LED) was synthesized by high-temperature solid-state reaction method. The characterization and luminescence properties of the phosphor were investigated. It is found that this phosphor can be effectively excited by 394 nm near-ultraviolet (n-UV) light, and exhibit bright red emission centered at 613 nm corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. It is shown that the 11 mol% of Eu 3+ doping concentration in Sr 2 B 2 O 5 :Eu 3+ , Na + phosphor is optimum, and the concentration quenching occurs when the Eu 3+ concentration is beyond 11 mol%. The concentration quenching mechanism can be interpreted by the dipole–dipole interaction of Eu 3+ ions. The present work suggests that this novel phosphor is a kind of potential red emitting phosphor.
Publisher: American Chemical Society (ACS)
Date: 08-10-2019
Publisher: American Chemical Society (ACS)
Date: 11-09-2017
Publisher: Elsevier BV
Date: 07-2018
Publisher: Wiley
Date: 05-02-2020
Publisher: AIP Publishing
Date: 2017
DOI: 10.1063/1.4974877
Abstract: Theories of spontaneous emission rates and carrier recombination mechanisms for multiple-quantum-well InGaN-based blue light-emitting diodes (LEDs) have been carefully studied. A relationship among the optical power, the current density, and the temperature (heat-sink temperature or p-n junction temperature) is identified, and an optical-electrical-thermal model (OETM) is proposed. Thereafter, spectral measurements have been carried out to confirm the validity of this OETM. Results show that measured optical powers under various current densities and heat-sink temperatures agree satisfactorily with those determined by the OETM. Furthermore, the traditional forward-voltage method (FVM) has also been carried out for comparison. Junction temperatures determined by this OETM is in accordance with those measured by the FVM. Therefore, this model can serve as an alternative tool for fast estimating junction temperatures after relevant fitting coefficients having been determined.
Start Date: 05-2023
End Date: 05-2024
Amount: $500,000.00
Funder: Australian Research Council
View Funded Activity