Research Article Open Access

Investigation of Structural and Optical Properties of Single Phase Czts Thin Films Synthesized by Spin Coating Technique

Abstract

In the present work, the Cu₂ZnSnS₄ (CZTS) thin films are prepared by spin coating technique. The phase purity of prepared film is confirmed by X-ray diffractometer technique. The CZTS thin film shows single phase of kesterite structure with a dominant peak at 28.7° corresponds to the plane (112) which also confirmed by Raman peak at 331 cm^-1. The coefficient of absorption and direct band gap values of 104 cm^-1 and 1.50 eV, respectively are determined by UV-Visible spectrophotometer technique. The optical results show that prepared thin film is ideal for solar cell applications. The SEM images shows that a uniform and homogeneous film is prepared which having average particle size of 36.0 nm. Furthermore, the surface morphology and roughness determined by AFM technique confirm that a smooth thin film of CZTS is prepared. The Hall measurements showed the p-type conductivity with carrier concentration ~1.55×10¹⁶ cm^-3, conductivity ~65.08×10^-2 Ω^-1 cm^-1, and hall mobility ~26.15 cm²/Vs at room temperature. Therefore, present research work provides a good quality CZTS thin film prepared by sol-gel assisted spin coating technique, which is cost effective and also applicable for large scale production.

Jagdish Prasad1,2*, Yadava J1, Nehraa S1, Sharmaa H1, Singh M1

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