Advances on the synthesis of solution-processed Cu2ZnSnS4 thin films

摘要

This work reports the recent advances on the synthesis and characterization of thin Cu₂ZnSnS₄ (CZTS) films prepared by chemical solution deposition. CZTS colloids dispersed in water-ethanol solutions were used as precursors and prepared by coprecipitation by mixing CuCl₂-2H₂O, ZnCl₂, SnCl₂ and thiourea (NH2)2CS in water-ethanol mixtures. The CZTS films were deposited on glass substrates by spin-coating. After being deposited, the films were heat-treated in vacuum at 300-340 °C for 10 minutes. Characterization of CZTS by X-ray diffraction measurements did not give conclusive results, but Raman spectroscopy testified that prepared samples are multiphase comprising probably Cu2SnS3 as an impurity phase and kesterite CZTS as the predominant one.