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Enhance planar perovskite solar cells efficiency via two-step deposition by using DMF as additive to optimize crystal growth behavior

Abstract

The performance of perovskite solar cells (PSCs) is extremely dependent on the morphology and crystallization of perovskite film. However, the complete conversion of PbI2 to perovskite and the controlled perovskite crystal size as well as surface morphology are challengeable in the conventional two-step sequential deposition method. We herein present a facile way towards the use of the polar solvent additive in the inter-diffusion two-step sequential deposition method for a high quality perovskite film. The results show that the addition of a small amount of DMF solvent into the MAI precursor solution can help the complete conversion of PbI2 to perovskite, and at the same time, it can also reduce the pinholes, improve the film morphology, increase the grain sizes and enhance the film absorption ability. The improved perovskite film quality results in the boosting performance of PSCs and an optimized device with power conversion efficiency as high as 19.2% is obtained. This current method provides a highly repeatable route for enhancing the PSC performance in inter-diffusion sequential solution deposition method.

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Publication details

The article was received on 18 Feb 2017, accepted on 17 May 2017 and first published on 18 May 2017


Article type: Paper
DOI: 10.1039/C7TA01517H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enhance planar perovskite solar cells efficiency via two-step deposition by using DMF as additive to optimize crystal growth behavior

    J. Mo, C. Zhang, J. Chang, H. Yang, H. Xi, D. Chen, Z. Lin, G. Lu, J. Zhang and Y. Hao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA01517H

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