Enhanced Moisture Stability of Cesium-Containing Compositional Perovskites by a Feasible Interfacial Engineering

Nan Li; Zonglong Zhu; Qingshun Dong; Jiangwei Li; Zhanlue Yang; Chu-Chen Chueh; Alex K.-Y. Jen; Liduo Wang

doi:10.1002/admi.201700598

Enhanced Moisture Stability of Cesium-Containing Compositional Perovskites by a Feasible Interfacial Engineering

Nan Li, Zonglong Zhu, Qingshun Dong, Jiangwei Li, Zhanlue Yang, Chu-Chen Chueh, Alex K.-Y. Jen^*, Liduo Wang^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

86 Citations (Scopus)

Abstract

The compositional perovskites have attracted broad attention due to the improved photovoltaic performance and enhanced stability compared with the single cation perovskite, such as methylammonium lead iodide and formamidinium lead iodide. In this study, the moisture stability of the widely used cesium and bromide-containing mixed perovskites is carefully studied by characterizing the morphology, crystallization, and device performance before and after the exposure to moisture. Though the mixed perovskites possess strong resistance to moisture in the ambient air, a rapid degradation is observed when the perovskites are exposed to a high relative humidity (RH) up to 70%. The degradation is evidenced by the obvious appearance of CsPbI₃ phase along with needle-like morphology after several hours' storage in 70% RH. Moreover, to suppress the erosion of perovskites by the high-level moisture, an interfacial engineering is introduced with phenylethylammonium iodide (PEAI). The PEAI passivation not only shows a retarded degradation but also delivers an enhanced photovoltaic performance from 13% to >17% with much improved stability under high-level moisture. The results imply the efficacy of interfacial engineering in fabricating high-efficiency and stable perovskite solar cells.

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Original language	English
Article number	1700598
Journal	Advanced Materials Interfaces
Volume	4
Issue number	20
Online published	20 Jul 2017
DOIs	https://doi.org/10.1002/admi.201700598
Publication status	Published - 23 Oct 2017

Funding

The research was funded by the National Natural Science Foundation of China under Grant Nos. 51273104 and 91433205. This work was supported by the Office of Naval Research (N00014-14-1-0246), the Asian Office of Aerospace R&D (FA2386-15-1-4106), and the Department of Energy SunShot (DE-EE0006710). A.K.-Y.J. thanks the Boeing-Johnson Foundation for financial support.

Research Keywords

cesium
mixed cation perovskites
moisture stability
surface passivation

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abstract = "The compositional perovskites have attracted broad attention due to the improved photovoltaic performance and enhanced stability compared with the single cation perovskite, such as methylammonium lead iodide and formamidinium lead iodide. In this study, the moisture stability of the widely used cesium and bromide-containing mixed perovskites is carefully studied by characterizing the morphology, crystallization, and device performance before and after the exposure to moisture. Though the mixed perovskites possess strong resistance to moisture in the ambient air, a rapid degradation is observed when the perovskites are exposed to a high relative humidity (RH) up to 70%. The degradation is evidenced by the obvious appearance of CsPbI3 phase along with needle-like morphology after several hours' storage in 70% RH. Moreover, to suppress the erosion of perovskites by the high-level moisture, an interfacial engineering is introduced with phenylethylammonium iodide (PEAI). The PEAI passivation not only shows a retarded degradation but also delivers an enhanced photovoltaic performance from 13% to >17% with much improved stability under high-level moisture. The results imply the efficacy of interfacial engineering in fabricating high-efficiency and stable perovskite solar cells.{\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Li, Nan

AU - Zhu, Zonglong

AU - Dong, Qingshun

AU - Li, Jiangwei

AU - Yang, Zhanlue

AU - Chueh, Chu-Chen

AU - Jen, Alex K.-Y.

AU - Wang, Liduo

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N2 - The compositional perovskites have attracted broad attention due to the improved photovoltaic performance and enhanced stability compared with the single cation perovskite, such as methylammonium lead iodide and formamidinium lead iodide. In this study, the moisture stability of the widely used cesium and bromide-containing mixed perovskites is carefully studied by characterizing the morphology, crystallization, and device performance before and after the exposure to moisture. Though the mixed perovskites possess strong resistance to moisture in the ambient air, a rapid degradation is observed when the perovskites are exposed to a high relative humidity (RH) up to 70%. The degradation is evidenced by the obvious appearance of CsPbI3 phase along with needle-like morphology after several hours' storage in 70% RH. Moreover, to suppress the erosion of perovskites by the high-level moisture, an interfacial engineering is introduced with phenylethylammonium iodide (PEAI). The PEAI passivation not only shows a retarded degradation but also delivers an enhanced photovoltaic performance from 13% to >17% with much improved stability under high-level moisture. The results imply the efficacy of interfacial engineering in fabricating high-efficiency and stable perovskite solar cells.© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

AB - The compositional perovskites have attracted broad attention due to the improved photovoltaic performance and enhanced stability compared with the single cation perovskite, such as methylammonium lead iodide and formamidinium lead iodide. In this study, the moisture stability of the widely used cesium and bromide-containing mixed perovskites is carefully studied by characterizing the morphology, crystallization, and device performance before and after the exposure to moisture. Though the mixed perovskites possess strong resistance to moisture in the ambient air, a rapid degradation is observed when the perovskites are exposed to a high relative humidity (RH) up to 70%. The degradation is evidenced by the obvious appearance of CsPbI3 phase along with needle-like morphology after several hours' storage in 70% RH. Moreover, to suppress the erosion of perovskites by the high-level moisture, an interfacial engineering is introduced with phenylethylammonium iodide (PEAI). The PEAI passivation not only shows a retarded degradation but also delivers an enhanced photovoltaic performance from 13% to >17% with much improved stability under high-level moisture. The results imply the efficacy of interfacial engineering in fabricating high-efficiency and stable perovskite solar cells.© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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KW - moisture stability

KW - surface passivation

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Enhanced Moisture Stability of Cesium-Containing Compositional Perovskites by a Feasible Interfacial Engineering

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