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Citation: Bing Cai, Wen-Hua Zhang, Jieshan Qiu. Solvent engineering of spin-coating solutions for planar-structured high-efficiency perovskite solar cells[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1183-1190. doi: 10.1016/S1872-2067(15)60929-9 shu

Solvent engineering of spin-coating solutions for planar-structured high-efficiency perovskite solar cells

1.
a Carbon Research Laboratory, Liaoning Key Laboratory for Energy Materials and Chemical Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China;

Corresponding author: Jieshan Qiu,
Received Date: 21 May 2015
Available Online: 16 June 2015
Fund Project: 国家自然科学基金(21336001, 20873141). (21336001, 20873141)

Control of the morphology and coverage of high-quality perovskite films is the main issue affecting planar-structured perovskite solar cells fabricated by solution processing. In this work, the solvent engineering of mixed solutions for spin-coating uniform perovskite thin films was investigated in detail by adding different ratios of N,N-dimethylformamide (DMF) or γ-butyrolactone (GBL) to dimethyl sulfoxide (DMSO). The morphology and film thickness of the resulting perovskite films were found to be significantly altered. At 20%~40% (volume fraction) of N,N-dimethylformamide mixed with DMSO, micrometer scale grains and reduced grain boundaries were observed on the highly uniform perovskite thin films. The optimized planar-structured perovskite solar cells showed power conversion efficiency as high as 16.5% and a stabilized efficiency of 14.4% at a fixed forward bias of 0.88 V.
- Perovskite,
- Film,
- Solar cell,
- Solvent engineering,
- Morphology,
- Device performance
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