Effects of potassium treatment on SnO2 electron transport layers for improvements of perovskite solar cells

Kim, SeongYeon; Zhang, Fei; Tong, Jinhui; Chen, Xihan; Enkhbayar, Enkhjargal; Zhu, Kai; Kim, JunHo

doi:10.1016/j.solener.2022.01.053

Effects of potassium treatment on SnO₂ electron transport layers for improvements of perovskite solar cells

Journal Article · Sat Jan 29 00:00:00 EST 2022 · Solar Energy

DOI:https://doi.org/10.1016/j.solener.2022.01.053· OSTI ID:1845690

Kim, SeongYeon ^[1]; Zhang, Fei ^[2]; Tong, Jinhui ^[2]; Chen, Xihan ^[2]; Enkhbayar, Enkhjargal ^[3]; Zhu, Kai ^[2]; Kim, JunHo ^[3]

National Renewable Energy Lab. (NREL), Golden, CO (United States); Incheon National Univ. (Korea, Republic of)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Incheon National Univ. (Korea, Republic of)

SnO₂ has been studied intensively as an electron transport layer (ETL) for highly efficient metal halide perovskite solar cells. However, SnO₂ ETL frequently exhibits defect-related issues associated with the bulk SnO₂ and the perovskite/SnO₂ interface, and to passivate the defect states potassium ion has been used. In order to investigate the passivation effect of potassium ion, we carried out KCl treatment on the solution-processed SnO₂ ETL. It was found that KCl-treatment shifted up conduction band maximum and Fermi energy of SnO₂, and reduced the band gap of perovskite absorber by K⁺ diffusion, which resulted in a better conduction band alignment at perovskite/SnO₂. Admittance spectroscopy revealed that diffused K⁺ ions can passivate defects of the perovskite absorber layer. With the improvement of band alignment and defect passivation via the KCl treatment, the J-V hysteresis was almost eliminated and power conversion efficiency was much enhanced with improved open-circuit voltage and fill factor.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1845690

Alternate ID(s):: OSTI ID: 1842846

Report Number(s):: NREL/JA--5900-81964; MainId:82737; UUID:9f0a6a87-cf8c-4bbe-9dab-729a4ad4f9b0; MainAdminID:63859

Journal Information:: Solar Energy, Journal Name: Solar Energy Vol. 233; ISSN 0038-092X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Effects of potassium treatment on SnO₂ electron transport layers for improvements of perovskite solar cells