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Se profiles in CST films formed by annealing CdTe/CdSe bi-layers

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conference contribution
posted on 24.01.2020 by Shamara Collins, Chih An Hsu, Vasilios Palekis, Ali Abbas, Michael Walls, Chris Ferekides
Se profiles in CST (CdSe X Te 1-x ) films formed by annealing CdTe/CdSe bilayers has been studied using transmission electron microscopy (TEM) and photoluminescence (PL). The effect of CdSe layer thickness and CdCl 2 annealing conditions on the alloy layer were investigated. The CdSe thickness was varied from 75 to 1,500 Å. All “thick” films (CdSe Å300 Å) exhibited smaller grain structure at the interface compared to the “thin” films (CdSe 75-30 Å), which exhibited large columnar grains that extended through the CST/CdTe film thickness. The alloy layer for “thick” CdSe films appeared as a bilayer with two CST compositions: Se-rich and Te-rich. Photoluminescence measurements revealed Se related defects in the films with thicker CdSe (1,000 and 1,500 Å). The Se compositional profile was found to be greatly dependent on the CdSe thickness and CdCl 2 heat treatment conditions. The formation of voids at the interface for large CdSe thicknesses suggests that this approach may be only suitable for the formation of relatively low Se content CST films.

Funding

OTH Supersolar hub - Extension : EP/P02484X/1

IAA 17 - Michael Walls - EPG June 17

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Research Unit

  • Centre for Renewable Energy Systems Technology (CREST)

Published in

2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)

Pages

114 - 118

Publisher

IEEE

Version

AM (Accepted Manuscript)

Rights holder

© IEEE

Publisher statement

© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publication date

2018-11-29

Copyright date

2018

ISBN

9781538685297

Language

en

Location

Waikoloa Village, HI, USA

Event dates

10th June 2018 - 15th June 2018

Depositor

Dr Ali Abbas. Deposit date: 21 January 2020

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