期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 27, 期 1, 页码 75-83出版社
SPRINGER
DOI: 10.1007/s10008-022-05297-6
关键词
Dye-sensitized solar cells; ZnO; Metal-organic frameworks; ZIF-8; Surface modification
Metal-organic frameworks (MOFs) were used to modify nanoparticulate ZnO electrodes in order to enhance the performance of dye-sensitized solar cells (DSSCs). It was found that the immersion of the ZnO film in a low-concentration precursor solution effectively improved the photocurrent density and charge transfer, while also improving the durability of the cell.
Metal-organic frameworks (MOFs) were used to modify the surface of nanoparticulate ZnO electrodes, aiming at enhancing the performance of dye-sensitized solar cells (DSSCs). Zeolitic imidazolate framework-8 (ZIF-8) consisting of Zn2+ ions and 2-methylimidazolates was chosen and their concentrations in precursor solutions were set as experimental conditions for the MOF-modification. A thin ZIF-8 layer with a thickness of 3 nm could be formed on the ZnO surface by immersing the ZnO film in a high-concentration precursor solution at room temperature, as confirmed by field-emission transmission electron microscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. However, both short-circuit photocurrent density (J(SC)) and open-circuit photovoltage of the cell using the above ZIF-8-modified electrode were decreased probably because of the inhibition of the electron injection from photoexcited dyes. In contrast, the immersion of the ZnO film in a low-concentration precursor solution was found to be effective in enhancing J(SC), which was explained by the improved charge transfer through the surface passivation of the ZnO electrode. Another positive effect was the improved durability observed in the cell using the modified electrode.
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