Journal
ISCIENCE
Volume 22, Issue -, Pages 534-+Publisher
CELL PRESS
DOI: 10.1016/j.isci.2019.11.007
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Funding
- National Natural Science Foundation of China [51620105006, 61721005]
- Zhejiang Province Science and Technology Key Plan [2018C01047]
- International Science and Technology Cooperation Program of China (ISTCP) [2016YFE0102900]
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Heat is crucial to the long-term stability of perovskite solar cells (PVSCs). Herein, thermal stability of PVSCs based on metal oxide (MO) and polymer (P) was investigated. Firstly, chemical decomposition behavior of perovskite films was characterized and analyzed, revealing that chemically active MO would accelerate the decomposition ofmethylamine lead iodide (MAPbI(3)). Secondly, thermal-induced stress, resulting fromthemismatched thermal expansion coefficients of different layers of PVSCs, and its effect on the mechanical stability of perovskite films were studied. Combining experiment and simulation, we conclude that soft'' (low modulus) and thick (>20 nm) interfacial layers offer better relaxation of thermal-induced stress. As a result, PVSCs employing thick polymer interfacial layer offer a remarkably improved thermal stability. This work offers not only the degradation insight of perovskite films on different substrates but also the path toward highly thermal stable PVSCs by rational design of interfacial layers.
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