期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 44, 页码 24791-24798出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b07703
关键词
charge recombination; perovskite solar cells; solid state; p-doping; spectrum; impedance spectroscopy
资金
- Sustainable Power and Energy Center (SPEC) under Frontier of Innovation Award by University of California San Diego
- Jacobs School of Engineering at UC San Diego
We propose a spectrum-dependent mechanism for the oxidation of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine) -9,9'-spirobifluorene (Spiro-OMeTAD) with bis-(trifluoromethane)sulfonimide lithium salt (LiTFSI), which is commonly used in perovskite solar cells as the hole transport layer. The perovskite layer plays different roles in the Spiro-OMeTAD oxidization for various spectral ranges. The effect of oxidized Spiro-OMeTAD on the solar cell performance was observed and characterized. With the initial long-wavelength illumination (>450 nm), the charge recombination at the TiO2/Spiro-OMeTAD interface was increased due to the higher amount of the oxidized Spiro-OMeTAD. On the other hand, the increased conductivity of the Spiro-OMeTAD layer and enhanced charge transfer at the Au/Spiro-OMeTAD interface facilitated the solar cell performance.
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