標題: Development of Novel Mixed Halide/Superhalide Tin-Based Perovskites for Mesoscopic Carbon-Based Solar Cells
作者: Rameez, Mohammad
Shahbazi, Saeed
Raghunath, Putikam
Lin, Ming Chang
Hung, Chen Hsiung
Diau, Eric Wei-Guang
交大名義發表
應用化學系
應用化學系分子科學碩博班
National Chiao Tung University
Department of Applied Chemistry
Institute of Molecular science
公開日期: 2-Apr-2020
摘要: Tin perovskites suffer from poor stability and a self-doping effect. To solve this problem, we synthesized novel tin perovskites based on superhalide with varied ratios of tetrafluoroborate to iodide and implemented them into solar cells based on a mesoscopic carbon-electrode architecture because film formation was an issue in applying this material for a planar heterojunction device structure. We undertook quantum-chemical calculations based on plane-wave density functional theory (DFT) methods and explored the structural and electronic properties of tin perovskites FASnI(3-x)(BF4)(x) in the series x = 0, 1, 2, and 3. We found that only the x = 2 case, FASnI(BF4)(2), was successfully produced, beyond the standard FASnI(3). The electrochemical impedance and X-ray photoelectron spectra indicate that the addition of tin tetrafluoroborate instead of SnI2 suppressed trap-assisted recombination by decreasing the Sn4+ content. The power conversion efficiency of the FASnI(BF4)(2) device with FAI and Sn(BF4)(2) in an equimolar ratio improved 72% relative to that of a standard FASnI(3) solar cell, with satisfactory photostability under ambient air conditions.
URI: http://dx.doi.org/10.1021/acs.jpclett.0c00479
http://hdl.handle.net/11536/154386
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.0c00479
期刊: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume: 11
Issue: 7
起始頁: 2443
結束頁: 2448
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