Controlling Light Absorption in Charge-Separating Core/Shell Semiconductor Nanocrystals
| Autor: | Bharati Panigrahy, Aniruddha R Yelameli, Anshu Pandey, Rekha Mahadevu |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
business.industry Band gap General Engineering Absorption cross section General Physics and Astronomy Nanotechnology Heterojunction Cadmium telluride photovoltaics Semiconductor Photovoltaics Quantum dot Optoelectronics General Materials Science business Absorption (electromagnetic radiation) |
| Zdroj: | ACS Nano. 7:11055-11063 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | 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 CdTe. 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. |
| Databáze: | OpenAIRE |
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