期刊
POLYMERS
卷 14, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/polym14020343
关键词
perovskite solar cells; hole transport layer; spiro-OMeTAD; PMMA; stability
资金
- National Natural Science Foundation of China [61874083, 62004151, 61804113]
This study explores the use of a PMMA-doped spiro-OMeTAD hole transport layer to improve the stability of perovskite solar cells (PSCs). It is found that PMMA effectively enhances the moisture and oxygen resistance of spiro-OMeTAD, resulting in improved device stability by separating the perovskite layer from moisture and oxygen.
Perovskite solar cells (PSCs) based on the 2,2 ',7,7 '-tetrakis(N,N-di-p-methoxyphenylamine)-9,9 '-spirobifluorene (spiro-OMeTAD) hole transport layer have exhibited leading device performance. However, the instability caused by this organic function layer is a very important limiting factor to the further development of PSCs. In this work, the spiro-OMeTAD is doped with polymethyl methacrylate (PMMA), which is further used as the hole transport layer to improve the device stability. It is shown that the PMMA can effectively improve the moisture and oxygen resistance of spiro-OMeTAD, which leads to improved device stability by separating the perovskite layer from moisture and oxygen. The device efficiency can maintain 77% of the original value for PSCs with the PMMA-doped spiro-OMeTAD hole transport layer, under a natural air environment (RH = 40%) for more than 80 days. The results show that the moisture- and oxygen-resistant PMMA:spiro-OMeTAD hole transport layer is effective at improving the device performance.
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