Controlling Light Absorption in Charge-Separating Core/Shell Semiconductor Nanocrystals

Mahadevu, Rekha and Yelameli, Aniruddha R and Panigrahy, Bharati and Pandey, Anshu (2013) Controlling Light Absorption in Charge-Separating Core/Shell Semiconductor Nanocrystals. In: ACS NANO, 7 (12). pp. 11055-11063.

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Abstract

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.

Item Type:	Journal Article
Publication:	ACS NANO
Publisher:	AMER CHEMICAL SOC
Additional Information:	Copyright for this article belongs to the AMER CHEMICAL SOC, USA
Keywords:	semiconductor nanocrystal; quantum dot; heterostructure; absorption cross section; type-II
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	03 Feb 2014 11:30
Last Modified:	03 Feb 2014 11:30
URI:	http://eprints.iisc.ac.in/id/eprint/48302

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