X-ray diffraction and compositional studies of AgInS2 thin films obtained by spray pyrolysis
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Silver indium sulfide (AgInS2) thin films have been prepared by the spray pyrolysis technique using silver acetate, indium acetate, and N,N-dimethylthiourea as precursor compounds. Depending on the film preparation conditions, AgInS2 thin films are obtained which could be candidates to be used in photovoltaic devices. X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) compositional studies were done on films formed at different substrate temperatures (T s) and Ag:In:S ratios in the starting solutions. When Ag:In:S ratios are 1:1:1, 1:0.25:2, and 1:1:2, XRD patterns of the thin films indicated that the crystallographic structure is mainly chalcopyrite AgInS2. An additional phase, acanthite Ag2S, appeared when the depositions where done at low T s. EDS analysis showed that AgInS2 films near stoichiometric composition were obtained by using an atomic ratio of Ag:In:S = 1:1:2 in the starting solution and T s = 400 °C.
KeywordsChalcopyrite Spray Pyrolysis Ag2S Energy Dispersive Spectroscopy Analysis Indium Content
The authors would like to thank Dra. Hilda Esperanza Esparza Ponce (CIMAV-Chihuahua) for EDS analysis, M.C. Ma. Luisa Ramón for XRD analysis, and Ing. J. Ortega-Cruz for technical assistance in the electrical measurements. The authors are grateful to DGAPA-UNAM (project IN 111506) for the financial support.