Journal
NANOSCALE
Volume 8, Issue 47, Pages 19804-19810Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr07450b
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Funding
- Shenzhen Jiawei Photovoltaic Lighting Co. Ltd
- Tsinghua University Initiative Scientific Research Program [20161080165]
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The Lewis acid-base reaction between PbI2 and solvent molecules is popular in fabricating PbI2 films by a two-step method for making perovskite solar cells. Here, we control the microstructure of PbI2 films through modulating the Lewis acid-base reaction by adding a small amount of N-methyl pyrrolidone into PbI2/DMF solution. PbI2 films with excellent crystallinity and full coverage are fabricated by spin-coating the mixed solution on the substrate, which leads to high quality perovskite layers with low recombination rate and high efficiency for carrier transfer. As a result, the power conversion efficiency of the best perovskite solar cells increases from 13.3% to 17.5%.
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