期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 9, 页码 5981-5989出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10093
关键词
perovskite solar cells; hole transporters; stability; humidity; doping; hydrophobic
资金
- Engineering and Physical Sciences Research Council [EP/G049653/1, EP/M024881/1] Funding Source: researchfish
- EPSRC [EP/G049653/1, EP/M024881/1] Funding Source: UKRI
Solar cells based on organic inorganic perovskite semiconductor materials have recently made rapid improvements in performance, with the best cells performing at over 20% efficiency. With such rapid progress, questions such as cost and solar cell stability are becoming increasingly important to address if this new technology is to reach commercial deployment. The moisture sensitivity of commonly used organic-inorganic metal halide perovskites has especially raised concerns. Here, we demonstrate that the hygroscopic lithium salt commonly used as a dopant for the hole transport material in perovskite solar cells makes the top layer of the devices hydrophilic and causes the solar cells to rapidly degrade in the preserice of moisture. By using novel, low cost, and hydrophobic hole transporters in conjunction with a doping method incorporating a preoxidized salt of the respective hole transporters, we are able to prepare efficient perovskite solar cells with greatly enhanced water resistance.
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