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Formation and optical properties of CuInSe2 and CuInTe2 nanocrystals in silicate glass

Valerij S. GURIN 2Ivan V. Bodnar 1Alexandra P. Molochko 1Nina P. Solovei 1

1. Belarusian State University of Informatics and Radioelectronics (BSUIR), P.Brovka str. 6, Minsk 220000, Belarus
2. Belarusian State University (BSU), F. Skaryna av. 4, Minsk 220050, Belarus

Abstract

A creation of nanoscale semiconductors with the proper control of properties is of great significance in nanomaterials technology. The nature of semiconductors determines basically optical features, and the next factors are: size and crystalline structure of nanoparticles, matrix composition, interaction of the particles with environment, etc. The synthesis of silicate glasses with ternary semiconductor nanoparticles CuInSe2 and CuInTe2 has been developed by us recently, and in the present work, we consider studies of post-treatment of these glasses that reveals noticeable effect upon optical properties.
The bulk crystalline precursors CuInSe2 and CuInTe2 were produced by means of the single-temperature method with composition control by chemical analysis and XRD and doped to the glass system SiO2-CaO-R2O (R = Na, K, Li) under synthesis by the high-temperature melting in rducing conditions. The post-treatment was performed by heating under 500-600oC during various time intervals. TEM evidenced spherical nanoparticles those were initially in the glass remain concentration with slight growth. Optical absorption (studied in the visible and near IR ranges) of the glasses varies significantly only at 600oC treatment (that temperature is close to the beginning of matrix softening). Transmittance of the glasses becomes lower, and the excitonic maximum (appearing in the range 550-600 nm) grows in the case of CuInSe2, while in CuInTe2 nanoparticles it only red shifted (0.05 eV).
The studies showed that in our preparation procedure nucleation and growth of CuInSe2 and CuInTe2 nanocrystals in silicate glass occur at the step of primary melting. The method is useful for development of new optical materials for optoelectronic and non-linear optical applications.

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium F, by Valerij S. GURIN
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-27 23:16
Revised:   2009-06-08 12:55