Reducing Energy Disorder for Efficient and Stable Sn−Pb Alloyed Perovskite Solar Cells

Cheng Peng, Chongwen Li*, Mingzhe Zhu, Chujun Zhang, Xiafei Jiang, Hang Yin, Benlin He, Haiyan Li, Ming Li, Shu Kong So, Zhongmin Zhou*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

34 Citations (Scopus)


An organic small molecule, 1-bromo-4-(methylsulfinyl)benzene (BBMS), was utilized to reduce the energy disorder of a Sn−Pb alloyed perovskite film via hydrogen bonding and coordination bonding interactions, and the resultant BBMS-treated device showed a high efficiency of over 22 % as well as outstanding long-term stability.

Sn−Pb alloyed perovskites have drawn considerable attention because of their appropriate band gap for both single-junction and multi-junction tandem photovoltaics, but the easy-formation of energy disorder still limits their practical applications. Here, we report that the combination of 1-bromo-4-(methylsulfinyl) benzene (BBMS) and SnF2 greatly reduced the Urbach energy of perovskite films, and largely restrained the oxidation of Sn2+. With the help of density functional theory calculations, we clarified the interactions between BBMS and perovskite were responsible for the improvements. As a result, a high efficiency of >22 % was obtained for the Sn−Pb alloy-based solar cells treated by BBMS and SnF2. More importantly, the BBMS-treated devices demonstrated outstanding stability, retaining 98 % of its original efficiency after heating at 60 °C for 2660 h under N2.
Original languageEnglish
Article numbere202201209
Number of pages5
JournalAngewandte Chemie. International Edition
Issue number23
Early online date25 Mar 2022
Publication statusPublished - 7 Jun 2022

Scopus Subject Areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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