Fully Inorganic CsSnI3-Based Solar Cells with >6% Efficiency and Enhanced Stability Enabled by Mixed Electron Transport Layer

Shaoyang Ma, Xiaoyu Gu, Aung Koko Kyaw, Dong Hwan Wang, Shashank Priya, Tao Ye

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Fully inorganic black orthorhombic (B-γ) CsSnI3 has become a promising candidate for perovskite solar cell (PSC) thanks to its low toxicity and decently high theoretical power conversion efficiency (PCE). However, so far, the reported PCE of the B-γCsSnI3 PSC is still not comparable with its lead-based or organotin-based counterparts. Herein, a mixed electron transport layer (ETL) composed of ZnO nanoparticles (NPs) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is incorporated into inverted B-γCsSnI3 PSCs. The mixed ETL exhibits the merits of both ZnO and PCBM. The highest PCE of 6.08% was recorded for the PSC with mixed ZnO-PCBM ETL, which is 34.2% higher than that of the device with plain PCBM ETL (PCE of 4.53%) and 28.8% superior to that of plain ZnO ETL-based device (PCE of 4.72%). Meanwhile, the mixed ZnO-PCBM ETL-based PSC retained 71% of its initial PCE under inert conditions at room temperature after 60 days of storage and maintained 67% PCE after 20 days of storage under ambient air at 30% relative humidity and room temperature.

Original languageEnglish (US)
Pages (from-to)1345-1352
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number1
StatePublished - Jan 13 2021
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the Fundamental Research Funds for the Central Universities 2020RC017. A.K.K.K. acknowledges the support from the Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515010916), the Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting (No. 2017KSYS007), and the High-level University Fund (G02236004). D.H.W. acknowledges the Basic Science Research Program, through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT, & Future Planning (2019R1A2C1087653). T.Y. acknowledges the financial support from Nanosonic Inc. (STTR). S.P. acknowledges the financial support from National Science Foundation through award number 1936432.

Publisher Copyright:


  • composite
  • CsSnI
  • energy-level alignment
  • mixed electron transport layer
  • perovskite solar cell

PubMed: MeSH publication types

  • Journal Article


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