Optical Properties of Flash Evaporated Amorphous Se_100-XIn_X Thin Films for CuInSe₂ Solar Cell Applications

Cosmas M. Muiva, Kelebogile Maabong, Stephen T. Sathiaraj, and Julius M. Mwabora

Keywords

Thin films, In-Se, flash evaporation, CuInSe₂ solar cells

Abstract

Amorphous Se_100-XIn_X thin films were prepared by flash evaporation of the pre-melt quenched bulk samples. The samples were characterised and the suitability of each composition assessed towards applications as a buffer layers in CuInSe₂ photovoltaic cells. XRD studies confirmed that all the samples were amorphous. There was a descending dependence of complex dielectric constant and refractive index on wavelength which levelled in the infra-red (IR) region. A red shift in the optical energy gap E_g^opt from 1.76 eV for In = 5 at% to 1.46 eV for In = 20 at% was observed. The E_g^opt values were in the range that is compatible with solar energy conversion.

Important Links:

• DOI: 10.2316/P.2012.760-029
• From Proceeding (760) 760: 761: 762: 763: The IASTED 2012 African Conferences - 2012

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