Journal
ACS NANO
Volume 7, Issue 12, Pages 11055-11063Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn404749n
Keywords
semiconductor nanocrystal; quantum dot; heterostructure; absorption cross section; type-II
Categories
Funding
- ISRO-IISc-STC [ISTC/CSS/AP/312]
- Indian Institute of Science
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Semiconductor nanocrystals of different formulations have been extensively studied for use in thin-film photovoltaics. Materials used in such devices need to satisfy the stringent requirement of having large absorption cross sections. Hence, type-II semiconductor nanocrystals that are generally considered to be poor light absorbers have largely been ignored. In this article, we show that type-II semiconductor nanocrystals can be tailored to match the light-absorption abilities of other types of nanostructures as well as bulk semiconductors. We synthesize type-II ZnTe/CdS core/shell nanocrystals. This material is found to exhibit a tunable band gap as well as absorption cross sections that are comparable to (die. This result has significant implications for thin-film photovoltaics, where the use of type-II nanocrystals instead of pure semiconductors can improve charge separation while also providing a much needed handle to regulate device composition.
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