ORCID Profile
0000-0002-5849-4352
Current Organisation
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
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Publisher: Wiley
Date: 03-06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CP00008E
Abstract: In the presence of the cobalt dopant, the Helmholtz layer capacitance, C H , at the spiro-OMeTAD erovskite interface can be significantly reduced to a similar level of chemical capacitance at the TiO 2 erovskite interface, which leads to a new equivalent circuit proposed in this study for the interpretation of the IS data.
Publisher: American Chemical Society (ACS)
Date: 13-06-2018
Publisher: Wiley
Date: 26-07-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8EE02852D
Abstract: All inorganic perovskite solar cells lead to extended device lifespan in an accelerated ageing test.
Publisher: Wiley
Date: 24-06-2019
Publisher: American Chemical Society (ACS)
Date: 22-09-2023
Publisher: Wiley
Date: 03-08-2021
Abstract: Metal halide perovskites (MHP) can be made more stable through the addition of small amounts of cesium. Despite the improvement, these multication absorbers still display strong environmental sensitivity to any combination of factors, including water, oxygen, bias, temperature, and light. Here, the relationship is elucidated between light absorption, charge carrier radiative recombination, and relative humidity (rH) for the Cs 0.05 FA 0.79 MA 0.16 Pb(I 0.83 Br 0.17 ) 3 composition, revealing partially reversible reductions in the extinction coefficient and fully reversible 25× enhancements in absolute light emission registered across the same humidity cycles up to 70% rH. With in situ excitation wavelength‐dependent measurements, irreversible changes are identified in the perovskite after a single cycle of humidity‐dependent photoluminescence (PL) performed with 450 nm excitation. The in situ measurement platform can be extended to test the effect of other stressors on thin films’ optical behavior.
Publisher: Wiley
Date: 26-02-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EE00884E
Abstract: We employ direct piezoelectric force microscopy to examine the ferroelectric response of halide perovskites and prove that halide perovskites are ferroelectricity free.
Publisher: American Chemical Society (ACS)
Date: 26-03-2018
Publisher: American Chemical Society (ACS)
Date: 03-03-2022
DOI: 10.1021/ACS.JPCLETT.2C00131
Abstract: Metal halide perovskite (MHP) photovoltaics may become a viable alternative to standard Si-based technologies, but the current lack of long-term stability precludes their commercial adoption. Exposure to standard operational stressors (light, temperature, bias, oxygen, and water) often instigate optical and electronic dynamics, calling for a systematic investigation into MHP photophysical processes and the development of quantitative models for their prediction. We resolve the moisture-driven light emission dynamics for both methylammonium lead tribromide and triiodide thin films as a function of relative humidity (rH). With the humidity and photoluminescence time series, we train recurrent neural networks and establish their ability to quantitatively predict the path of future light emission with 18% error over 4 h. Together, our
Publisher: American Chemical Society (ACS)
Date: 05-05-2020
Publisher: American Chemical Society (ACS)
Date: 17-06-2020
Publisher: Wiley
Date: 14-12-2018
Publisher: Wiley
Date: 08-08-2021
Abstract: Interfaces play a crucial role in determining perovskite solar cells, (PSCs) performance and stability. It is therefore of great importance to constantly work toward improving their design. This study shows the advantages of using a hole‐transport material (HTM) that can anchor to the perovskite surface through halogen bonding (XB). A halo‐functional HTM (PFI) is compared to a reference HTM (PF), identical in optoelectronic properties and chemical structure but lacking the ability to form XB. The interaction between PFI and perovskite is supported by simulations and experiments. XB allows the HTM to create an ordered and homogenous layer on the perovskite surface, thus improving the perovskite/HTM interface and its energy level alignment. Thanks to the compact and ordered interface, PFI displays increased resistance to solvent exposure compared to its not‐interacting counterpart. Moreover, PFI devices show suppressed nonradiative recombination and reduced hysteresis, with a V oc enhancement of ≥20 mV and a remarkable stability, retaining more than 90% efficiency after 550 h of continuous maximum‐power‐point tracking. This work highlights the potential that XB can bring to the context of PSCs, paving the way for a new halo‐functional design strategy for charge‐transport layers, which tackles the challenges of charge transport and interface improvement simultaneously.
Publisher: Elsevier BV
Date: 12-2022
Location: Germany
No related grants have been discovered for QIONG WANG.