A soft-solution electrochemical processing technique for preparing CdTe/n-Si(l 0 0) heterostructures

H. Gómez, R. Henríquez, R. Schrebler, G. Riveros, D. Leinen, J. R. Ramos-Barrado, E. A. Dalchiele

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The rear side of an n type ( 1 0 0) Si wafer polished on one side was chosen as a substrate for CdTe thin film electrodeposition because its high density of surface non-uniformities is expected to result in a macroscopic equalization of injection conditions for electrons along the surface and subsequent uniform deposit growth. The films were grown from a plating bath containing 5 mM TeO2, 0.5 M CdSO4, 0.5 M H 2SO4 and 0.5 M NH4F at a temperature of 85 °C. The deposition potential was selected after studying the electrochemical behavior of the precursors by cyclic voltammetry. EDS analysis showed that films with near stoichiometric composition were obtained at ca. -0.575 V vs SCE. XRD showed that the as deposited films are well crystallized with a preferential orientation along the cubic direction, whereas AFM images show uniform and compact morphology. XPS results revealed that Te-O bonds, mainly in the surface, are also present.

Original languageEnglish
Pages (from-to)113-122
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume574
Issue number1
DOIs
StatePublished - 15 Dec 2004
Externally publishedYes

Keywords

  • CdTe
  • Electrodeposition
  • Si

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