Mixing of Azetidinium in Formamidinium Tin Triiodide Perovskite Solar Cells for Enhanced Photovoltaic Performance and High Stability in Air

Effat Jokar, Ping Huan Hou, Sumit S. Bhosale, He Shiang Chuang, Sudhakar Narra, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Overcoming the issue of the stability of tin-based perovskites is a major challenge for the commercial development of lead-free perovskite solar cells. To attack this problem, a new organic cation, azetidinium (AZ), is incorporated into the crystal structure of formamidinium tin triiodide (FASnI3) to form the mixed-cation perovskite AZxFA1-xSnI3. As AZ has a similar size to FA but a larger dipole moment, hybrid AZxFA1-xSnI3 films exhibit variation in optical and electronic properties on increasing the proportion of AZ. Trifluoromethylbenzene (CF3C6H5) serves as antisolvent to fabricate smooth and uniform perovskite films for the devices with an inverted planar heterojunction structure. The device performance is optimized to produce the greatest efficiency at x=0.15 (AZ15), for which a power conversion efficiency of 9.6 % is obtained when the unencapsulated AZ15 device is stored in air for 100 h. Moreover, the device retains 90 % of its initial efficiency for over 15 days. The significant performance and stability of this device reveal that the concept of mixed cations is a promising approach to stabilize tin-based perovskite solar cells for future commercialization.

Original languageEnglish
Pages (from-to)4415-4421
Number of pages7
JournalChemSusChem
Volume14
Issue number20
DOIs
StatePublished - 20 Oct 2021

Keywords

  • antisolvent effects
  • azetidinium
  • perovskites
  • solar cells
  • tin

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