https://scholars.lib.ntu.edu.tw/handle/123456789/636845
標題: | Formation of Stable Tin Perovskites Co-crystallized with Three Halides for Carbon-Based Mesoscopic Lead-Free Perovskite Solar Cells | 作者: | Tsai, Cheng-Min Mohanta, Nayantara Wang, Chi-Yung Lin, Yu-Pei Yang, Yaw-Wen CHIEN LUNG WANG Hung, Chen-Hsiung Diau, Eric Wei-Guang |
關鍵字: | carbon electrodes; halides; perovskites; solar cells; tin | 公開日期: | 23-十月-2017 | 卷: | 56 | 期: | 44 | 起(迄)頁: | 13819 | 來源出版物: | Angewandte Chemie (International ed. in English) | 摘要: | We synthesized and characterized methylammonium (MA) mixed tri-halide tin perovskites (MASnIBr2-x Clx ) for carbon-based mesoscopic solar cells free of lead and hole-transporting layers. Varied SnCl2 /SnBr2 ratios yielded tin perovskites with three halides (I, Br, and Cl) co-crystallized inside the tin-perovskite. When the SnCl2 proportion was ≥50 % (x≥1), phase separation occurred to give MASnI3-y Bry and MASnCl3-z Brz in the stoichiometric proportions of their precursors, confirmed by XRD. A device with MASnIBr1.8 Cl0.2 (SnCl2 =10 %) showed the best photovoltaic performance: JSC =14.0 mA cm-2 , VOC =380 mV, FF=0.573, and PCE=3.1 %, and long-term stability. Electrochemical impedance spectra (EIS) show superior charge recombination and dielectric relaxation properties for the MASnIBr1.8 Cl0.2 cell. Transient PL decays showed the intrinsic problem of tin-based perovskites with average lifetimes less than 100 ps. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/636845 | ISSN: | 14337851 | DOI: | 10.1002/anie.201707037 |
顯示於: | 化學系 |
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