Surface and Interfacial Passivations for FASnI3 Solar Cells with Co-Cations

Chun Hsiao Kuan, Yu An Ko, Eric Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Seven cations, methylammonium (MA), ethylammonium (EA), aziridinium (AZ), dimethylammonium (DMA), 2-hydroxyethylammonium (HEA), imidazolium (IM), and guanidinium (GA), were used to cocrystallize with formamidinium (FA) to form cocationic tin perovskite solar cells (TPSCs) using a two-step fabrication procedure. Time-of-flight second ion mass spectrometry results indicate that the pristine FA-based TPSC involved both vacancies on the perovskite surface and perovskite/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) interface, and GA has the ability to passivate both surface and interfacial vacancy defects to give impressive device performance (PCE = 11.2%) and stability (>5000 h) with a negligible effect of hysteresis.

Original languageEnglish
Pages (from-to)2423-2425
Number of pages3
JournalACS Energy Letters
Issue number5
StatePublished - 12 May 2023


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