The Influence of Layer Number on Properties of Cu2ZnSnS4 Films

Year 2017, Volume: 1 Issue: 2, 79 - 85, 31.10.2017

Güven Turgut , Eyüp Fahri Keskenler

Abstract

In present study,
Cu₂ZnSnS₄ thin films were deposited via single-step sol-gel spin coating
process.  The effect of layer number on
the structural, morphological and optical properties was investigated. XRD
results showed that 7 layered film had crystal structure but other films had
amorphous structure. 7 layered film grown at (112) preferential orientation and
it had another peak of (200). AFM analysis indicated that any particle on
surface of 3, 4 and 5 layered films was not observed and the particle structure
was observed for 6 and 7 layer films. The crystallite sizes for 6 layer films
were very small, but 7 layer films had both small and big particles on its
surface. This particle structure was not homogenous for the film surfaces. From
UV-VIS studies, optical band gap of 3, 4, 5, 6 and 7 layered films were found
to be   1.88 eV, 1.82 eV, 1.73 eV, 1.68
eV and 1.48 eV, respectively. This result indicates that 7 layered film is very
suitable for solar cell as an absorber layer.

Keywords

Cu2ZnSnS4, Sol-gel, Optical Properties

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