Quaternary co-electrodeposition of the Cu2ZnSnS4 films as potential solar cell absorbers
Cu2ZnSnS4 (CZTS) films are successfully prepared on Mo substrate by electrochemical epitaxial method. An electrolyte contains 0.124 M CuSO4·5H2O, 0.14 M ZnSO4, 0.13 M SnCl2·2H2O, 0.16 M Na2S2O3·5H2O, 2.25 M NaOH, 1.36 M C6H5Na3O7, 1.00 M C4H6O6. The equilibrium potential for quaternary co-electrodeposited solution is set at −1.1 ∼ −1.20 V. The results show that elements are deposited in the following sequence: Cu/S/Zn/S/Cu/S/Sn/S…. The ternary and quaternary compounds are formed with the increasing temperature during annealing. Finally the CZTS film can be well formed at 550 °C. The resistivity of CZTS is about 5.6 × 104 Ω cm.
KeywordsCoated Glass Substrate Atomic Layer Epitaxy CZTS Thin Film Quaternary Compound CZTS Film
This work is supported by the National Nature Science Foundation of China (61176062), Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Undergraduate Technology Innovation of Nanjing Institute of Technology (205090133).