Effect of Processing Technique Factors on Structure and Photophysical Properties of Perovskite Absorption Layer by Using Two-Step Spin-Coating Method

The investigation of crystal growth is crucial for us to improve the film quality and photophysical properties of CH3NH3PbI3 (MAPbI3). In the two-step spin-coating process, the crystal structure could be modulated by controlling the growth conditions of PbI2 and CH3NH3I (MAI) layers. In this paper,...

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Published inCrystals (Basel) Vol. 10; no. 9; p. 761
Main Authors Zhou, Zixiao, Zou, Xiaoping, Zhu, Jialin, Cheng, Jin, Ren, Haiyan, Chang, Chuangchuang, Yao, Yujun, Chen, Dan, Yu, Xing, Li, Guangdong, Wang, Junqi, Liu, Baoyu
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2020
Subjects
Absorption
anneal
Annealing
Ceramic fibers
Crystal growth
Crystal structure
Diffusion layers
Experiments
Glass substrates
Grain size
liquid–liquid diffusion
Methods
Morphology
Perovskite structure
Perovskites
phase transition
Phase transitions
Polymers
solution concentration
Spectrum analysis
Spin coating
two-step spin-coating process
Beijing China
China
Germany
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Summary:The investigation of crystal growth is crucial for us to improve the film quality and photophysical properties of CH3NH3PbI3 (MAPbI3). In the two-step spin-coating process, the crystal structure could be modulated by controlling the growth conditions of PbI2 and CH3NH3I (MAI) layers. In this paper, the PbI2 layer was treated with annealing under different times. A liquid–liquid diffusion (LLD) mechanism is proposed to modify the deposition of MAI precursor solution and enhance the flatness of organic–inorganic hybrid perovskite film. Furthermore, the perovskite films are prepared using different concentrations of MAI. The evolution process of perovskite structure is observed by modulating the concentration of MAI. The spin-coating of moderate MAI tends to form high quality MAPbI3 films with enhanced absorption and carrier extraction capabilities. The high concentration of MAI would cause the perovskite phase transition, which provides a novel perspective to modulate the structure of organic–inorganic hybrid perovskite in the two-step spin-coating process, although it deteriorates the device performance.
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ISSN:2073-4352
2073-4352
DOI:10.3390/cryst10090761