Universal Approach toward Hysteresis-Free Perovskite Solar Cell via Defect Engineering

Journal of the American Chemical Society
Dae-Yong SonNam-Gyu Park

Abstract

Organic-inorganic halide perovskite is believed to be a potential candidate for high efficiency solar cells because power conversion efficiency (PCE) was certified to be more than 22%. Nevertheless, mismatch of PCE due to current density (J)-voltage (V) hysteresis in perovskite solar cells is an obstacle to overcome. There has been much lively debate on the origin of J-V hysteresis; however, effective methodology to solve the hysteric problem has not been developed. Here we report a universal approach for hysteresis-free perovskite solar cells via defect engineering. A severe hysteresis observed from the normal mesoscopic structure employing TiO2 and spiro-MeOTAD is almost removed or does not exist upon doping the pure perovskites, CH3NH3PbI3 and HC(NH2)2PbI3, and the mixed cation/anion perovskites, FA0.85MA0.15PbI2.55Br0.45 and FA0.85MA0.1Cs0.05PbI2.7Br0.3, with potassium iodide. Substantial reductions in low-frequency capacitance and bulk trap density are measured from the KI-doped perovskite, which is indicative of trap-hysteresis correlation. A series of experiments with alkali metal iodides of LiI, NaI, KI, RbI and CsI reveals that potassium ion is the right element for hysteresis-free perovskite. Theoretical studies sugge...Continue Reading

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Citations

Jun 6, 2018·Physical Chemistry Chemical Physics : PCCP·Xin LiHong Lin
Aug 15, 2018·Small·Somayeh Gholipour, Michael Saliba
Apr 2, 2019·Advanced Materials·Ian A HowardUlrich W Paetzold
Mar 28, 2019·Chemical Communications : Chem Comm·Shengfan WuAlex K-Y Jen
May 8, 2019·Advanced Materials·Erkan AydinStefaan De Wolf
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May 7, 2020·Physical Chemistry Chemical Physics : PCCP·Priya Srivastava, Monojit Bag
Sep 20, 2018·Advanced Materials·Jiangzhao Chen, Nam-Gyu Park
Sep 11, 2020·Chemical Society Reviews·Nengxu LiHuanping Zhou
Aug 14, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Mei LyuNam-Gyu Park
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Mar 25, 2021·ACS Applied Materials & Interfaces·Zhuojia LinYiwang Chen
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Apr 24, 2021·Physical Chemistry Chemical Physics : PCCP·Yongchang GuoJianping Wang

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