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
Wang, Chien-Lung
Hung, Chen-Hsiung
Diau, Eric Wei-Guang
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: carbon electrodes;halides;perovskites;solar cells;tin
公開日期: 23-十月-2017
摘要: We synthesized and characterized methylammonium (MA) mixed tri-halide tin perovskites (MASnIBr(2-x)Cl(x)) for carbon-based mesoscopic solar cells free of lead and holetransporting 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 MAS-nI(3-y)Br(y) and MASnCl(3-z)Br(z) in the stoichiometric proportions of their precursors, confirmed by XRD. A device with MASnIBr(1.8)Cl(0.2) (SnCl2= 10%) showed the best photovoltaic performance: J(SC)= 14.0 mAcm(-2), V-OC= 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 MASnIBr(1.8)Cl(0.2) cell. Transient PL decays showed the intrinsic problem of tinbased perovskites with average lifetimes less than 100 ps.
URI: http://dx.doi.org/10.1002/anie.201707037
http://hdl.handle.net/11536/143951
ISSN: 1433-7851
DOI: 10.1002/anie.201707037
期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume: 56
起始頁: 13819
結束頁: 13823
顯示於類別:期刊論文