Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1785.doi: 10.7503/cjcu20210228

• Physical Chemistry • Previous Articles     Next Articles

Moisture-assisted Crystallization of Inorganic Perovskite CsPbI3 Film

LI Yanyan, DUAN Linrui, LUO Jingshan()   

  1. Institute of Photoelectronic Thin Film Devices and Technology,College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China
  • Received:2021-04-06 Online:2021-06-10 Published:2021-06-08
  • Contact: LUO Jingshan E-mail:jingshan.luo@nankai.edu.cn
  • Supported by:
    the National Young Talent Program, China and the Start?up Fund of Nankai University, China

Abstract:

Moisture-assisted recrystallization strategy was used to improve the quality of CsPbI3 film, and the influence of different relative humidity(RH) on the crystallization was investigated by studying the morphology, trap-induced recombination, and photovoltaic performance. The results showed that different from the CsPbI3 films annealed at 0%RH with obvious grain boundaries, the ones at appropriate humidity show more compact binding between grains, which suppresses the nonradiative recombination. However, excessive humidity causes rougher surface which will affect the interface contact. By comparison, CsPbI3 films annealed at 7%RH have significantly reduced trap density, increased carrier lifetime, and restrained nonradiative recombination. The photovoltaic performance test shows that the open circuit voltage(Voc) and fill factor(FF) increase a lot and an efficiency of 15.28% is obtained.

Key words: CsPbI3 film, Moisture-assist, Annealed crystallization

CLC Number: 

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