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Structure and optical properties of screen-printed CdS-CdSe films

Nikolai A. Drozdov 1,  Tivanov S. Mikhail 1,  Alexander K. Fedotov 1,  Ostretsov Eugen 2,  Survilo Ludmila 2,  Trofimov Yuri 2

1. Belarusian State University (BSU), F. Skaryna av. 4, Minsk 220050, Belarus
2. Institute of Electronics, National Academy of Science of Belarus, Minsk, Belarus

Abstract

CdSxSe1-x films at present time are widely applied in production of photoelectrical devices for visible and near-IR regions. The vacuum sputtering commonly used for fabrication of such films are relatively expensive and therefore are inexpedient for preparation of large area photosensitive layers. The screen-printing method can be viewed as an alternative to sputtering and is capable to find a wide application in technology of large area solar cells, photoresistors, etc. In this method a paste containing material to be deposited is pressed through the screen onto the substrate and then subjected to heat treatment to achieve the required photoresponce.

In this work the structural and optical properties of CdSxSe1-x films produced by screen-printing method were investigated. The initial pastes were produced on the base of fine-dispersed CdS, CdSe and dopant-containing powders, CdCl2 flux powder and binder. The as-screen-printed films were dried and then annealed at 500 - 600 °С. The study of XRD, surface morphology, composition and its in-area and in-depth distribution, and also distribution of intensity of different photoluminescence bands by the film area testify that CdS-CdSe films can be transformed into solid solutions CdSxSe1-x after annealing. It was shown that the film properties were strongly sensitive to the CdS/CdSe powder ration, type of binder and heat treatment regimes (temperature and duration).
 

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium F, by Alexander K. Fedotov
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 06:07
Revised:   2009-06-07 00:44