Journal
CHEMPHYSCHEM
Volume 17, Issue 5, Pages 771-776Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201500627
Keywords
copper sulfide nanocrystals; phase transformations; quantum dots; solar cells; thin films
Funding
- National Natural Science Foundation of China [21573018, 11474021]
- Open Research Fund of the State Key Laboratory of Supramolecular Structure and Materials [sklssm2015029]
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Owing to their high electrical conductivity, tunable plasmonic absorption spectra, low cost, and abundance in nature, Cu2-xS 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-xS 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-xS 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 Cu2S nanocrystal films that are derived from annealed Cu1.8S nanocrystal films.
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