Studies on the Mechanism of Electrodeposition and Electrocrystallization of Te, CdTe and HgCdTe

Abstract

Abstract: The electrodeposition and nucleation mechanism of Te, CdTe and HgCdTe at glassy-carbon or titanium electrode were investigated.The results show that; (1)The cathodic reduction of HTeOjf in acidic solution obeys the four-electron reduction mechanism.The electrocrystallization of Te at Ti electrode is followed by three-dimensional instantaneous nucleation mechanism controlled by diffusion of HTeO²⁺ ions.(2)CdTe is electrodeposited according to the reduction of tellurous acid followed by the electroreduction of Cd₂⁺ and Te.Howerer, the electrocrystallization of CdTe is relatively complicated.According to the variation of step potential, temperature and pHof the solution, the electro-crystallization of CdTe at Ti electrode is transformed from three-dimensional instantaneous nucleation controlled by diffusion to two-dimensional instantaneous nucleation mechanism.(3)The mechanism electrodeposition of HgCdTe can be considered as following:(这里有图片19930524-675-1.gif)And its electrocrystallization growth depends on the nucleation of CdTe, and it seems to follow the two-dimensional instantaneous nucleation mechanism under our experimental conditions.

Key words: Te, CdTe, HgCdTe, Electrodeposited films, Electrocrystallizatlon nucleation

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YE De-Liang, ZHANG Ying-Zhou, SU Wen-Duan, ZHOU Shao-Min . Studies on the Mechanism of Electrodeposition and Electrocrystallization of Te, CdTe and HgCdTe[J]. Chem. J. Chinese Universities, 1993, 14(5): 675.

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Studies on the Mechanism of Electrodeposition and Electrocrystallization of Te, CdTe and HgCdTe

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