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Optical Signatures of Impurity-Impurity Interactions in Copper Containing II-VI Alloy Semiconductors

Bhattacharyya, Biswajit and Gahlot, Kushagra and Viswanatha, Ranjani and Pandey, Anshu (2018) Optical Signatures of Impurity-Impurity Interactions in Copper Containing II-VI Alloy Semiconductors. In: JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9 (3). pp. 635-640.

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Official URL: http://dx.doi.org/10.1021/acs.jpclett.7b03087

Abstract

We study the optical properties of copper containing II-VI alloy quantum dots (CuxZnyCd1-x-ySe). Copper mole fractions within the host are varied from 0.001 to 0.35. No impurity phases are observed over this composition range, and the formation of secondary phases of copper selenide are observed only at x(Cu) > 0.45. The optical absorption and emission spectra of these materials are observed to be a strong function of x(Cu), and provide information regarding composition induced impurity-impurity interactions. In particular, the integrated cross section of optical absorption per copper atom changes sharply (from 1 x 10 (-2) nm(3) to 4 x 10 (-2) nm(3)) at x(Cu) = 0.12, suggesting a composition induced change in local electronic structure. These materials may serve as model systems to understand the electronic structure of I-III-VI2 semiconductor compounds.

Item Type: Journal Article
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Additional Information: Copy right for the article belong to AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 22 Mar 2018 13:57
Last Modified: 22 Mar 2018 13:57
URI: http://eprints.iisc.ernet.in/id/eprint/59254

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