Development of opto-electronic devices using electrochemically grown thin ZnSe layers

SAMANTILLEKE, A. P., DHARMADASA, I. M., PRIOR, K. A., CHOY, K. L., MEI, J., BACEWICZ, R. and WOLSKA, A. (2001). Development of opto-electronic devices using electrochemically grown thin ZnSe layers. Journal of Materials Science: Materials in Electronics, 12 (11), 661-666.

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Link to published version:: 10.1023/A:1012854101987

Abstract

ZnSe thin films of both p and n conducting types were successfully deposited on transparent conducting glass substrates using an electrochemical deposition technique. Thin films were deposited from an aqueous acidic electrolyte containing ZnSO4 and H2SeO3. Deposition of thin films in a voltage range of 0.0 to -1.0 V was investigated by means of a voltamogram. The most suitable deposition voltage range was found to be -0.48 to -0.62 V for ZnSe in this aqueous medium. The nature of the surface of the conducting glass and the deposited ZnSe layers were studied using atomic force microscopy (AFM). Although the substrate surface was rough and spiky as observed from the AFM studies, electrodeposited ZnSe layers exhibit good crystallinity when compared to MBE grown ZnSe layers on GaAs (1 0 0) surfaces. The C-V depth profiling studies suggest the level of charge carrier concentration to be in the semiconducting region for these thin film materials. Photoluminescence studies were carried out in order to study the energy states in the band gap region and the results indicate the presence of less number of defect levels in comparison with MBE grown ZnSe layers. The best p-n junction devices fabricated with electrodeposited layers to date display a rectification factor of over five orders of magnitude at 1.0 V. (C) 2001 Kluwer Academic Publishers.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1023/A:1012854101987
Depositing User: Ann Betterton
Date Deposited: 08 Mar 2010 15:02
Last Modified: 08 Mar 2010 15:02
URI: http://shura.shu.ac.uk/id/eprint/1283

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