Compact SnO2/Mesoporous TiO2 Bilayer Electron Transport Layer for Perovskite Solar Cells Fabricated at Low Process Temperature

Junyeong Lee; Jongbok Kim; Chang-Su Kim; Sungjin Jo

doi:10.3390/nano12040718

Compact SnO₂/Mesoporous TiO₂ Bilayer Electron Transport Layer for Perovskite Solar Cells Fabricated at Low Process Temperature

Nanomaterials (Basel). 2022 Feb 21;12(4):718. doi: 10.3390/nano12040718.

Authors

Junyeong Lee¹, Jongbok Kim², Chang-Su Kim³, Sungjin Jo¹

Affiliations

¹ School of Energy Engineering, Kyungpook National University, Daegu 41566, Korea.
² Department of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea.
³ Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science, Changwon 51508, Korea.

Abstract

Charge transport layers have been found to be crucial for high-performance perovskite solar cells (PSCs). SnO₂ has been extensively investigated as an alternative material for the traditional TiO₂ electron transport layer (ETL). The challenges facing the successful application of SnO₂ ETLs are degradation during the high-temperature process and voltage loss due to the lower conduction band. To achieve highly efficient PSCs using a SnO₂ ETL, low-temperature-processed mesoporous TiO₂ (LT m-TiO₂) was combined with compact SnO₂ to construct a bilayer ETL. The use of LT m-TiO₂ can prevent the degradation of SnO₂ as well as enlarge the interfacial contacts between the light-absorbing layer and the ETL. SnO₂/TiO₂ bilayer-based PSCs showed much higher power conversion efficiency than single SnO₂ ETL-based PSCs.

Keywords: compact SnO2; mesoporous TiO2; oxygen plasma; perovskite solar cell low process temperature.

Abstract

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