Interfacial Sulfur Functionalization Anchoring SnO2 and CH3 NH3 PbI3 for Enhanced Stability and Trap Passivation in Perovskite Solar Cells

ChemSusChem
Zhen WangShuzi Hayase

Abstract

Trap states at the interface or in bulk perovskite materials critically influence perovskite solar cells performance and long-term stability. Here, a strategy for efficiently passivating charge traps and mitigating interfacial recombination by SnO2 surface sulfur functionalization is reported, which utilizes xanthate decomposition on the SnO2 surface at low temperature. The results show that functionalized sulfur atoms can coordinate with under-coordinated Pb2+ ions near the interface. After device fabrication under more than 60 % humidity in ambient air, the efficiency of methylammonium lead iodide (MAPbI3 ) perovskite solar cells based on sulfur-functionalized SnO2 increased from 16.56 % to 18.41 % with suppressed hysteresis, which resulted from the accelerated interfacial charge transport kinetics and decreased traps in bulk perovskite by interfacial sulfur functionalization. Additionally, thermally stimulated current studies show the decreased trap density in the shallow trap area after interfacial sulfur functionalization. The interfacial sulfur functionalized solar cells without sealing also exhibited considerable retardation of solar cell degradation with only 10 % degradation after 70 days air storage. This work demonst...Continue Reading

References

Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Nov 21, 2014·Nature Communications·Letian DouYang Yang
Aug 19, 2015·Journal of the American Chemical Society·Jing CaoNanfeng Zheng
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Aug 19, 2016·ChemSusChem·Hui-Seon KimNam-Gyu Park
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Jul 25, 2017·ChemSusChem·An-Na Cho, Nam-Gyu Park

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Citations

Nov 21, 2019·Chemical Communications : Chem Comm·Jie DouMingdeng Wei
Nov 22, 2019·Nanotechnology·Dong-Nyuk JeongNam-Gyu Park
Jan 25, 2020·Beilstein Journal of Nanotechnology·Xianfeng DaiFanan Wei
Jul 26, 2019·Nanoscale·Jing ZhuangJizheng Wang
May 20, 2021·ACS Applied Materials & Interfaces·Li ChenJian-Xin Tang
Oct 10, 2019·The Journal of Physical Chemistry Letters·Jung Hwan LeeJong Hyeok Park
Sep 19, 2019·ACS Applied Materials & Interfaces·Ershuai JiangJichun Ye

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