Cu2ZnSnSe4 thin films prepared by selenization of one-step electrochemically deposited Cu–Zn–Sn–Se precursors

• Published in: Applied surface science Vol. 273; pp. 613 - 616
• Main Authors: Meng, Mingming, Wan, Lei, Zou, Peng, Miao, Shiding, Xu, Jinzhang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2013; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Copper; COPPER SULFATE; Cross-disciplinary physics: materials science; rheology; Cu2ZnSnSe4; DEPOSITION; ELECTRODEPOSITION; Electrolytes; Exact sciences and technology; MICA; Optical properties; Physics; Precursors; PROPERTIES; Solar energy materials; Spectroscopic analysis; Spectroscopy; THIN FILMS; Thin films; Electrodeposition; Cu2ZnSnSe4; Solar energy materials; Cu; ZnSnSe; Step; Film growth
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2013.02.088

► Selenization one-step electrochemical deposition Cu–Zn–Sn–Se precursors to fabricate CZTSe thin films for the first time. ► Studied the effect of different rate of each element in electrolyte and the influence of pH. ► Prepared Cu2ZnSnSe4 that is pure and close to stoichiometric. ► Proved the structure of CZTSe is Kesterite-type. In this research a non-vacuum strategy was reported in facile preparation of kesterite-type Cu2ZnSnSe4 (CZTSe) thin films via selenization of one-step electrochemically prepared Cu–Zn–Sn–Se precursors. The Cu–Zn–Sn–Se precursor films were prepared by electrochemical deposition from electrolytes containing CuSO4, ZnSO4, SnCl4 and H2SeO3, and the substrate is a Mo coated soda-lime glass. The CZTSe thin films were obtained by annealing the electrochemically deposited films in the selenium vapors at the temperature of 550°C. The crystal phases, micro-structures, chemical compositions and optical properties of CZTSe films have been studied by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma optical emission spectrometer (ICP-OES), Raman scattering spectrum, and UV–vis absorption spectroscopic means. The results revealed that the electrolytes with Cu:Zn:Sn:Se molar ratio of 3:70:20:3 yields nearly pure phase of kesterite, and a band gap of 0.94eV was determined by spectroscopic measurements.