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Formation of Stable Tin Perovskites Co-crystallized with Three Halides for Carbon-Based Mesoscopic Lead-Free Perovskite Solar Cells.
Tsai, Cheng-Min; Mohanta, Nayantara; Wang, Chi-Yung; Lin, Yu-Pei; Yang, Yaw-Wen; Wang, Chien-Lung; Hung, Chen-Hsiung; Diau, Eric Wei-Guang.
Affiliation
  • Tsai CM; Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, 30010, Taiwan.
  • Mohanta N; Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, 30010, Taiwan.
  • Wang CY; Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, 30010, Taiwan.
  • Lin YP; Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, 30010, Taiwan.
  • Yang YW; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.
  • Wang CL; Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, 30010, Taiwan.
  • Hung CH; Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan.
  • Diau EW; Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, 30010, Taiwan.
Angew Chem Int Ed Engl ; 56(44): 13819-13823, 2017 10 23.
Article in En | MEDLINE | ID: mdl-28872747
ABSTRACT
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.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Angew Chem Int Ed Engl Year: 2017 Document type: Article Affiliation country: Taiwan
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Angew Chem Int Ed Engl Year: 2017 Document type: Article Affiliation country: Taiwan