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Enhancing Loading Amount and Performance of Quantum-Dot-Sensitized Solar Cells Based on Direct Adsorption of Quantum Dots from Bicomponent Solvents
journal contribution
posted on 2019-01-02, 00:00 authored by Wenran Wang, Huashang Rao, Wenjuan Fang, Hua Zhang, Mengsi Zhou, Zhenxiao Pan, Xinhua ZhongIntrinsically weak
interaction between oil-soluble quantum dots
(QDs) and TiO2 in a direct adsorption process limits QD
loading and the performance of QD-sensitized solar cells (QDSCs).
Herein, the underlying chemistry and mechanisms governing QD adsorption
on TiO2 were studied to improve QD loading and cell performance.
Experimental results indicate that solvent polarity plays the crucial
role in determining QD loading. Compared with single-component solvents,
substantially greater QD loading can be realized at the critical point
(CP) of bicomponent solvents, where QDs become metastable and start
to precipitate. Through this strategy, average efficiency of 12.24%
was obtained for ZCISe QDSCs, which is comparable to those based on
the capping ligand induced self-assembly route. This report demonstrates
the great potential of bicomponent solvents at the CP for high QD
loading and excellent cell performance and presents a platform for
assembling functional composites with the use of different nanocrystals
and substrates.