高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1785.doi: 10.7503/cjcu20210228

• 物理化学 • 上一篇    下一篇

水分辅助对无机钙钛矿CsPbI3薄膜结晶的影响

李艳艳, 段林瑞, 罗景山()   

  1. 南开大学电子信息与光学工程学院, 光电子薄膜器件与技术研究所, 天津 300350
  • 收稿日期:2021-04-06 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 罗景山 E-mail:jingshan.luo@nankai.edu.cn
  • 基金资助:
    国家级青年人才项目和南开大学启动经费资助

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

摘要:

利用水分辅助晶粒溶解重结晶策略提高全无机铯铅碘钙钛矿(CsPbI3)薄膜的质量, 探究了退火过程中不同湿度条件对薄膜结晶质量的影响, 并从形貌结构、 缺陷复合以及光伏性能等方面进行了研究. 结果表明, 相比于相对湿度(RH)为0%组CsPbI3薄膜明显的晶界空隙, 适当的湿度退火有助于晶粒间更致密地结合, 晶界的减少进而可抑制载流子非辐射复合; 湿度过大则会形成较粗糙的表面形貌, 影响界面接触. 实验结果表明, 7%RH下CsPbI3薄膜中缺陷明显减少, 非辐射复合得到抑制, 载流子寿命增加; 光伏性能测试结果显示, 开路电压(Voc)和填充因子(FF)显著增大, 并获得了15.28%的光电转换效率(PCE).

关键词: 全无机铯铅碘钙钛矿薄膜, 水分辅助, 退火结晶

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

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