高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (5): 675.

• 研究论文 • 上一篇    下一篇

Te、CdTe、HgCdTe的电沉积及其成核机理

叶德良, 张瀛州, 苏文煅, 周绍民   

  1. 厦门大学化学系、物理化学研究所, 厦门 361005
  • 收稿日期:1992-05-05 修回日期:1993-01-21 出版日期:1993-05-24 发布日期:1993-05-24
  • 通讯作者: 苏文煅
  • 基金资助:

    国家自然科学基金

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

YE De-Liang, ZHANG Ying-Zhou, SU Wen-Duan, ZHOU Shao-Min   

  1. Department of Chemistry, Institute of Physical Chemistry, Xiamen University, Xiamen, 361005
  • Received:1992-05-05 Revised:1993-01-21 Online:1993-05-24 Published:1993-05-24

PDF (PC)

被引次数

10

摘要： 应用自装微机联用恒电位系统研究了在玻璃碳或铁电极上Te、CdTe、HgCdTe的电沉积及其电结晶成核机理。结果表明,在酸性溶液中,HTeO2+的阴极还原符合4电子还原机理,其电结晶生长表现为由HTeO2+扩散控制的三维瞬时成核机理;CdTe沉积层的形成是亚碲酸还原的延续,其电结晶成核机理因电位阶跃值、沉积温度及溶液pH值的改变而由HTeO2+扩散控制的三维瞬时成核转变为二维瞬时成核机理;对HgCdTe,其电沉积过程的动力学步骤可设想为:Hg2++2e—→Hg,HTeO2++3H++4e—→Te+2H2O xHg+Te—→HgxTe,Hg2Te+(1—x)Cd2++2(1—x)e—→HgxCd1-xTe相关的结晶生长除受各种实验因素影响外,还与CdTe的成核过程有关。在本文实验条件下,大体遵循二维瞬时成核机理。

关键词: Te, CdTe, HgCdTe, 电沉积膜, 电结晶成核

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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