Citation: Ge Yang, Mu Xulin, Lu Yue, Sui Manling. Photoinduced Degradation of Lead Halide Perovskite Thin Films in Air[J]. Acta Physico-Chimica Sinica, ;2020, 36(8): 190503. doi: 10.3866/PKU.WHXB201905039 shu

Photoinduced Degradation of Lead Halide Perovskite Thin Films in Air

Ge Yang ^1,2 ,
Mu Xulin ^1,2 ,
Lu Yue ^1,2,, ,
Sui Manling ^1,2,,

1.
Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, P. R. China
2.
Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, P. R. China

Corresponding author: Lu Yue, luyuerr@163.com Sui Manling, mlsui@bjut.edu.cn
Received Date: 8 May 2019
Revised Date: 5 June 2019
Accepted Date: 6 June 2019
Available Online: 14 June 2019
Fund Project: The project was supported by the National Key Research and Development Program of China (2016YFB0700700), the National Natural Science Fund for Innovative Research Groups, China (51621003), the National Natural Science Foundation of China (11704015), the Scientific Research Key Program of Beijing Municipal Commission of Education, China (KZ201310005002), and Beijing Municipal Found for Scientific Innovation, China (PXM2019_014204_500031)Beijing Municipal Found for Scientific Innovation, China PXM2019_014204_500031the National Natural Science Fund for Innovative Research Groups, China 51621003the National Key Research and Development Program of China 2016YFB0700700the National Natural Science Foundation of China 11704015the Scientific Research Key Program of Beijing Municipal Commission of Education, China KZ201310005002

As an excellent photoelectric material, metal halide perovskites have been rapidly developed in the photovoltaic field. The power conversion efficiency of solar cells based on perovskite materials now exceeds 24%, which is close to the conversion efficiency of silicon-based solar cells. However, organic-inorganic hybrid perovskite materials are sensitive to light, oxygen, and moisture, particularly when combined in the ambient environment, limiting their commercial application in perovskite devices due to their poor environmental stability. Therefore, a comprehensive understanding of the degradation mechanism is the key for development of an effective method to inhibit the degradation of perovskite materials. Herein, the photo-induced degradation process of CH₃NH₃PbI₃ films in air was studied by conventional optical and structural characterization methods, including ultraviolet-visible (UV-Vis) absorption spectroscopy, X-ray diffraction (XRD) and advanced transmission electron microscopy (TEM) equipped with a probe spherical aberration corrector. The CH₃NH₃PbI₃ films were first decomposed into hexagonal PbI₂ and amorphous phase, and subsequently oxidized to the amorphous phase under the combined effects of light and oxygen. The molecular formula of the amorphous phase was further confirmed as PbI_2−2xO_x (0.4 < x < 0.6) via X-ray energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS). Further analysis showed that the film degradation is mainly related to superoxide (O₂^•−) formed by combination of oxygen molecules and photoelectrons in the perovskite film. The organic part of the CH₃NH₃PbI₃ is oxidized by O₂^•− and CH₃NH₃PbI₃ is decomposed to form volatile products, such as CH₃NH₂ and I₂, then degraded into PbI₂, and oxidized to form the amorphous PbI_2−2xO_x. Therefore, during the initial degradation of film under light soaking in air, the degradation sites are mainly located at the interface between CH₃NH₃PbI₃ and air. Many pores were observed on the film surface due to the large loss of volatile decomposition products during the initial degradation. The films then converted to a honeycomb hollow morphology due to the continuous consumption of material under light soaking, reducing the mass of the film as well. Finally, the entire film was oxidized to form an amorphous structure. Herein, for the first time, we report that the formation of amorphous oxides is accompanied by the degradation of perovskite film. This study presents a new understanding of the photo-induced degradation mechanism of perovskite films in air and provides novel theoretical guidance to promote the long-term stability of perovskite solar cells.
- Perovskite film,
- Photo-oxidation degradation,
- Transmission electron microscopy,
- Microstructure evolution,
- Amorphous phase
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