Title: | Formation of Stable Tin Perovskites Co-crystallized with Three Halides for Carbon-Based Mesoscopic Lead-Free Perovskite Solar Cells |
Authors: | 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 |
Keywords: | carbon electrodes;halides;perovskites;solar cells;tin |
Issue Date: | 23-Oct-2017 |
Abstract: | 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 |
Journal: | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION |
Volume: | 56 |
Begin Page: | 13819 |
End Page: | 13823 |
Appears in Collections: | Articles |