Electrochemical deposition of Cu2ZnSnS4 as a thin film solar cells absorption layer

Publish Year: 1394
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

ELECTROCHEMISTRY011_319

تاریخ نمایه سازی: 5 بهمن 1395

Abstract:

According to the special place of thin film solar cells among the second generation solar cells, many studies have done on thin film solar cells. In this study, our intention is to provide theCZTS solar cells. The CZTS has low band gap, very low cost compared to the other thin film solar cells, direct band gap semiconductor material with a high absorption coefficient and a multilayer structure. The vacuum coatings[1] have been successfully employed in the CZTS thinfilm solar cells. Since the synthesis of CZTS thin films by vacuum coatings methods is hard because of its compound, we follow those by electrodepositions method[2]. Methods We synthesis of CZTS thin films by electrochemical deposition because of its controllability andrepeatability. In the first step, CZTS thin film was prepared from aqueous electrolytic containing CuCl2 0.1 M, ZnCl2 0.1 M, SnCl4 0.1 M. and SeCl2 0.1 M, in a conventional three-electrodeelectrochemical cell assembly under different temperatures and pH. The electrochemical cellcontains a saturated solution of Ag/AgCl as a reference electrode, a graphite electrode as an inert counter electrode and stainless steel substrate (1×1 cm2) was used as the working electrode.Result and discussion The effect of pH and temperature treatment on the structural, morphological and compositional ofthe CZTS thin films was investigated. The cyclic voltammetry (CV) and chronoamperometry curves show the best uniform film has been reached by pH=1.5 because of complexing agents(Fig. 1.a and d). In the next level, it was investigated the effect of temperature treatment inpH=1.5. The cyclic voltammetry and chronoamperometry curves show that co-electrodeposition was improved in high temperature. In low temperature, the higher current density was applied because of low conductivity of solution. On the other hand, when the temperature is increasing, it does not require high current (Fig. 1. c and b). Totally, we have successfully synthesized Cu2ZnSnS4 (CZTS) thin films using electrodeposition method followed by different temperature and pH. It was founded that the best structure of film has been obtained in pH=1.5 and T=80℃. It is concluded that electrodeposition method is the cost effective and comfortable way to synthesize absorber layer of thin film solar cells.

Authors

m Shavandi

Department of semiconductors, Materials and energy research center, Tehran, Iran

a Massoudi

Department of semiconductors, Materials and energy research center, Tehran, Iran

y Ganjkhanlo

Department of semiconductors, Materials and energy research center, Tehran, Iran

m Javaheri

Department of semiconductors, Materials and energy research center, Tehran, Iran