Universal defects elimination for high performance thermally evaporated CsPbBr3 perovskite solar cells

Tianxing Xiang, Yulong Zhang, Han Wu, Jing Li, Long Yang, Kangwei Wang, Jianlong Xia, Zhao Deng, Junyan Xiao, Wei Li, Zhiliang Ku, Fuzhi Huang, Jie Zhong, Yong Peng, Yi Bing Cheng

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Inorganic CsPbBr3 perovskite has emerged as a promising material for fabricating highly stable perovskite solar cell devices. However, during the formation of thermally evaporated CsPbBr3 film, an all-solid reaction between CsBr and PbBr2 leads to non-uniform interfaces and high defect density in the perovskite film. In this work, we utilize a two-step sintering (TSS) method which successfully modifies the morphologies of thermally evaporated CsPbBr3 films and the power conversion efficiency of a champion CsPbBr3 perovskite solar cell achieves 9.35%. Steady-state photoluminescence, time-resolved photoluminescence and space-charge-limited-current results prove that the TSS process can effectively reduce defect densities also. Besides these improvements, the TSS device maintains 94% of initial efficiency after being heated at 100 °C without encapsulation for over 40 days under ambient lab condition. In comparison, the untreated device reduces about 15%. Transmission electron microscope results further prove the reduction of line defects in CsPbBr3 crystals after TSS treatment.

Original languageEnglish
Article number110317
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume206
DOIs
Publication statusPublished - Mar 2020

Keywords

  • All-inorganic CsPbBr perovskite solar cells
  • Defects elimination
  • Thermal evaporation method
  • Two-step sintering

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