Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (2): 330.

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Electrodeposition of CuInSe2 and Its Formation Mechanism

WU Mian-Li, LI Jie*, LIU Fang-Yang, LIU Jun, LAI Yan-Qing, ZHANG Zhi-An, LIU Ye-Xiang   

  1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
  • Received:2009-03-03 Online:2010-02-10 Published:2010-02-10
  • Contact: LI Jie. E-mail: csulightmetals@126.com
  • Supported by:

    湖南省自然科学基金(批准号: 09JJ3110), 湖南省研究生创新基金(批准号: 1343-74236000009)资助.

Abstract:

In this paper, CuInSe2 thin films were prepared by electrodeposition. The formation mechanism of CuInSe2 was primarily analyzed by cyclic voltammetry(CV), energy dispersive X-ray spectroscopy(EDS) and X-ray diffraction(XRD). The influence of deposition conditions on film stoichiometry, morphology and structure was also investigated. It was shown that the insertion of In into solid phase may proceed underpotential deposition mechanism involving two different routes: In3+ reduction by induced effect of Cu3Se2, and/or reaction with H2Se. The newly generated In and indium selenides may be assimilated into the formation CuInSe2 by reaction with copper selenides. A limiting current was observed at potentials between -0.58—-0.9 V vs. the saturated calomel electrode(SCE) at which smooth and dense CuInSe2 thin films with controllable stoichiometry were obtained. Crystallinity of electrodeposited films was improved largely after annealing.

Key words: CuInSe2; Solar cell; Electrodeposition; Formation mechanism; Induced effect; Annealing

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