Grain Boundary Defects Passivated with tert-Butyl Methacrylate for High-Efficiency Perovskite Solar Cells

Min Zhao, Jin Yan, Gang Yu, Weichuang Yang, Jiarui Wu, Yongqiang Zhang, Jiang Sheng*, Jingsong Sun, Chunhui Shou, More Authors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A high-quality perovskite film is critical to realize high-efficiency and hysteresis-less perovskite solar cells (PSCs). However, a solution-processed perovskite layer presents many ionic vacancies on grain boundaries, which serve as nonradiative recombination centers that cause a loss of photocurrent. Herein, a trace amount of Lewis base tert-butyl acrylate (TBA) with both effective C=O and C=C functional groups is introduced to synergistically control the crystallization process and saturate surface dangling bonds. The C=O groups of TBA strongly bond to the uncoordinated Pb2+ to be a more stable TBA-PbI2 Lewis adduct, slowing down the perovskite crystallization to form a high-crystalline quality film and suppressing the formation of nonradiative recombination defects at perovskite boundaries. In addition, the π-σ and π-πconjugated bonds of C=C and -C=O in TBA show a strong delocalized electron-rich structure, promoting the photogenerated charge carrier diffusion in the perovskite layer. As a consequence, the open-circuit voltage of a TBA-PSC is significantly increased from 1.07 to 1.12 V and the fill factor is improved from 78.20 to 81.56%. Thus, the TBA-PSC achieves a high power conversion efficiency of 22.82% with negligible hysteresis. Therefore, the TBA additive is a feasible and efficient method to improve the perovskite crystalline quality for high-performance PSCs.

Original languageEnglish
Pages (from-to)11298-11305
Number of pages8
JournalACS Applied Energy Materials
Volume4
Issue number10
DOIs
Publication statusPublished - 2021

Keywords

  • crystallization process
  • Lewis base
  • perovskite solar cell
  • surface passivation
  • tert-butyl acrylate

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