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

doi:10.1016/S1872-2067(15)60929-9

Abstract

Abstract:

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.

Key words: Perovskite, Film, Solar cell, Solvent engineering, Morphology, Device performance

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)60929-9

https://www.cjcatal.com/EN/Y2015/V36/I8/1183

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