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. 2020 Mar;32(9):e1905502.
doi: 10.1002/adma.201905502. Epub 2020 Jan 27.

Stable and High-Efficiency Methylammonium-Free Perovskite Solar Cells

Xiao-Xin Gao  1   2   3 , Wen Luo  2   4 , Yi Zhang  2 , Ruiyuan Hu  2 , Bao Zhang  1 , Andreas Züttel  4 , Yaqing Feng  1   3 , Mohammad Khaja Nazeeruddin  2
Affiliations

Stable and High-Efficiency Methylammonium-Free Perovskite Solar Cells

Xiao-Xin Gao et al. Adv Mater. 2020 Mar.

Abstract

Organic-inorganic metal halide perovskite solar cells (PSCs) have achieved certified power conversion efficiency (PCE) of 25.2% with complex compositional and bandgap engineering. However, the thermal instability of methylammonium (MA) cation can cause the degradation of the perovskite film, remaining a risk for the long-term stability of the devices. Herein, a unique method is demonstrated to fabricate highly phase-stable perovskite film without MA by introducing cesium chloride (CsCl) in the double cation (Cs, formamidinium) perovskite precursor. Moreover, due to the suboptimal bandgap of bromide (Br- ), the amount of Br- is regulated, leading to high power conversion efficiency. As a result, MA-free perovskite solar cells achieve remarkable long-term stability and a PCE of 20.50%, which is one of the best results for MA-free PSCs. Moreover, the unencapsulated device retains about 80% of the original efficiencies after a 1000 h aging study. These results provide a feasible approach to enhance solar cell stability and performance simultaneously, paving the way for commercializing PSCs.

Keywords: cesium chloride; lead bromide; methylammonium free; perovskite solar cells; thermal stability.

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