Phase Transformations of Copper Sulfide Nanocrystals: Towards Highly Efficient Quantum-Dot-Sensitized Solar Cells

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Lige LiuHaizheng Zhong

Abstract

Owing to their high electrical conductivity, tunable plasmonic absorption spectra, low cost, and abundance in nature, Cu2-x S nanocrystals are of great interest as functional materials for photovoltaic and photothermal applications. With the aim of developing low-cost high-efficiency quantum-dot-sensitized solar cells, solution-processed Cu2-x S nanocrystal films are synthesized and their phase transformations upon thermal treatment are investigated. A combination of experimental results and theoretical analysis illustrates the thermodynamic evolution of the crystal structures and the composition caused by the thermal-annealing process. The use of Cu2-x S nanocrystal films as counter electrodes in quantum-dot-sensitized solar cells is also explored. The devices have an optimized power-conversion efficiency of 5.81 % for tetragonal Cu2 S nanocrystal films that are derived from annealed Cu1.8 S nanocrystal films.

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Citations

Dec 20, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ward van der StamCelso de Mello Donega
Apr 11, 2017·Chemical Reviews·Claudia CoughlanKevin M Ryan
Jan 19, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Chenghui XiaCelso de Mello Donega
Jul 24, 2020·Journal of the American Chemical Society·Benjamin C SteimleRaymond E Schaak

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