Photovoltaic & Optoelectronic Device Group

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Fabrication of Efficient and Stable CsPbI3 Perovskite Solar Cells through Cation Exchange Process

Advanced Energy Materials Wiley 9:36 (2019)

Authors:

Cho Fai Jonathan Lau, Zhiping Wang, Nobuya Sakai, Jianghui Zheng, Chwen Haw Liao, Martin Green, Shujuan Huang, Henry J Snaith, Anita Ho‐Baillie
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Interfacial charge-transfer doping of metal halide perovskites for high performance photovoltaics

Energy and Environmental Science Royal Society of Chemistry (2019)

Authors:

Nakita Noel, Habisreutinger, A Pellaroque, F Pulvirenti, Bernard Wenger, F Zhang, Yen-Hung Lin, OG Reid, J Leisen, Y Zhang, S Barlow, Marder, A Kahn, HJ Snaith, CB Arnold, BP Rand

Abstract:

We demonstrate a method for controlled p-doping of the halide perovskite surface using molecular dopants, resulting in reduced non-radiative recombination losses and improved device performance.

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Light induced degradation in mixed-halide perovskites

Journal of Materials Chemistry C Royal Society of Chemistry (RSC) 7:30 (2019) 9326-9334

Authors:

Shuai Ruan, Maciej-Adam Surmiak, Yinlan Ruan, David P McMeekin, Heike Ebendorff-Heidepriem, Yi-Bing Cheng, Jianfeng Lu, Christopher R McNeill
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LiTFSI‐Free Spiro‐OMeTAD‐Based Perovskite Solar Cells with Power Conversion Efficiencies Exceeding 19%

Advanced Energy Materials Wiley 9:32 (2019)

Authors:

Boer Tan, Sonia R Raga, Anthony SR Chesman, Sebastian O Fürer, Fei Zheng, David P McMeekin, Liangcong Jiang, Wenxin Mao, Xiongfeng Lin, Xiaoming Wen, Jianfeng Lu, Yi‐Bing Cheng, Udo Bach
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Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals.

Small (Weinheim an der Bergstrasse, Germany) 15:34 (2019) e1901828

Authors:

Shixun Wang, Xinyu Shen, Yu Zhang, Xingwei Zhuang, Dingke Xue, Xiangtong Zhang, Jinlei Wu, Jinyang Zhu, Zhifeng Shi, Stephen V Kershaw, William W Yu, Andrey L Rogach

Abstract:

All-inorganic cesium lead halide perovskite nanocrystals (NCs) have demonstrated excellent optical properties and an encouraging potential for optoelectronic applications; however, mixed-halide perovskites, especially CsPb(Cl/Br)3 NCs, still show lower photoluminescence quantum yields (PL QY) than the corresponding single-halide materials. Herein, anhydrous oxalic acid is used to post-treat CsPb(Cl/Br)3 NCs in order to initially remove surface defects and halide vacancies, and thus, to improve their PL QY from 11% to 89% for the emission of 451 nm. Furthermore, due to the continuous chelating reaction with the oxalate ion, chloride anions from the mixed-halide CsPb(Cl/Br)3 perovskite NCs could be extracted, and green emitting CsPbBr3 NCs with PL QY of 85% at 511 nm emission are obtained. Besides being useful to improve the emission of CsPb(Cl/Br)3 NCs, the oxalic acid treatment strategy introduced here provides a further tool to adjust the distribution of halide anions in mixed-halide perovskites without using any halide additives.
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