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Ag 2 S Quantum Dot-Sensitized Solar Cells by First Principles: The Effect of Capping Ligands and Linkers.
Journal of Physical Chemistry. A 2017 September 29
Quantum dots solar cells, QDSCs, are one of the candidates for being a reliable alternative to fossil fuels. However, the well-studied CdSe and CdTe-based QDSCs present a variety of issues for their use in consumer-goods applications. Silver sulfide, Ag2 S, is a promising material, but poor efficiency has been reported for QDSCs based on this compound. The potential influence of each component of QDSCs is critical and key for the development of more efficient devices based on Ag2 S. In this work, density functional theory calculations were performed to study the nature of the optoelectronic properties for an anatase-TiO2 (101) surface sensitized with different silver sulfide nanoclusters. We demonstrated how it is possible to deeply tune of its electronic properties by modifying the capping ligands and linkers to the surface. Finally, an analysis of the electron injection mechanism for this system is presented.
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