Relationship between ion migration and interfacial degradation of CH3NH3PbI3 perovskite solar cells under thermal conditions

Seongtak Kim, Soohyun Bae, Sang Won Lee, Kyungjin Cho, Kyung Dong Lee, Hyunho Kim, Sungeun Park, Guhan Kwon, Seh Won Ahn, Heon Min Lee, Yoon Mook Kang, Haeseok Lee, Donghwan Kim

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Abstract

Organic-inorganic hybrid perovskite solar cells (PSCs) have been extensively studied because of their outstanding performance: a power conversion efficiency exceeding 22% has been achieved. The most commonly used PSCs consist of CH3NH3PbI3 (MAPbI3) with a hole-selective contact, such as 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spiro-bifluorene (spiro-OMeTAD), for collecting holes. From the perspective of long-term operation of solar cells, the cell performance and constituent layers (MAPbI3, spiro-OMeTAD, etc.) may be influenced by external conditions like temperature, light, etc. Herein, we report the effects of temperature on spiro-OMeTAD and the interface between MAPbI3 and spiro-OMeTAD in a solar cell. It was confirmed that, at high temperatures (85°C), I- and CH3NH3+ (MA+) diffused into the spiro-OMeTAD layer in the form of CH3NH3I (MAI). The diffused I- ions prevented oxidation of spiro-OMeTAD, thereby degrading the electrical properties of spiro-OMeTAD. Since ion diffusion can occur during outdoor operation, the structural design of PSCs must be considered to achieve long-term stability.

Original languageEnglish
Article number1200
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

ASJC Scopus subject areas

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    Kim, S., Bae, S., Lee, S. W., Cho, K., Lee, K. D., Kim, H., Park, S., Kwon, G., Ahn, S. W., Lee, H. M., Kang, Y. M., Lee, H., & Kim, D. (2017). Relationship between ion migration and interfacial degradation of CH3NH3PbI3 perovskite solar cells under thermal conditions. Scientific Reports, 7(1), [1200]. https://doi.org/10.1038/s41598-017-00866-6