Precursor engineering of lead acetate-based precursors for high-open-circuit voltage wide-bandgap perovskite solar cells

Jie Zhao, Anthony S.R. Chesman, Junlin Yan, Luke J. Sutherland, Jacek Jasieniak, Jianfeng Lu, Wenxin Mao, Udo Bach

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1 Citation (Scopus)


Wide-bandgap (WBG) perovskites have great potential for inclusion in efficient tandem solar cells, but large open-circuit voltage losses have limited device performance to date. Here, we show that a high-quality WBG perovskite, FA0.83Cs0.17Pb(I0.8Br0.2)3, with enlarged grain sizes and improved crystallinity can be achieved by incorporating lead chloride (PbCl2) into a lead acetate (PbAc2)-based precursor. The improved film quality resulted in the suppression of nonradiative recombination and a reduction in defect density. Efficient WBG perovskite solar cells (1.66 eV) with an efficiency of 19.3% and a high Voc of 1.22 V were fabricated using a facile one-step spin-coating method without the need for an antisolvent. Notably, the unencapsulated devices retained 90% of their initial power conversion efficiency after storage in a dry box (10% humidity) for 800 h.

Original languageEnglish
Pages (from-to)18800-18807
Number of pages8
JournalACS Applied Materials & Interfaces
Issue number15
Publication statusPublished - 19 Apr 2023


  • high open-circuit voltage
  • lead acetate
  • lead chloride
  • solar cells
  • wide-bandgap

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