Electrochemical synthesis of Cu-doped ZnTe films as back contacts to CdTe solar cells

Yongseok Jun, Kang Jin Kim, Donghwan Kim

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8 Citations (Scopus)

Abstract

Electrochemical deposition of Cu-doped ZnTe films was investigated as a back contact material for CdTe solar cells. The deposition system consisted of a potentiostat, a substrate (cathode), a Pt counter electrode, and an Ag/AgCl reference electrode. Experimental conditions were: pH=2.5∼4, deposition temperature=70 ∼80°C electrolyte concentration=0.02 M Zn2+, 10-4 M TeO2, and deposition potential (Va) = -0.85 ∼-1.0 V vs. Ag/AgCl. A cyclic voltammogram obtained from an ITO substrate showed a ZnTe reduction peak at Va = -0.7 ∼ -0.9 V. A film obtained at pH=2.5, Va=-0.975 V showed the strongest ZnTe X-ray diffraction peak, but its surface morphology was not as smooth as the films made under the condition of pH=3∼4, Va=-0.950V. Triethanolamine did not form a complex with Cu2+ in acidic solution as needed for uniform Cu-doping, but oxalate anion and 1,10-phenanthroline did at pH=2∼3. The efficiency of CdTe solar cells increased from 3.4% to 7.1% when Cu-doped ZnTe film was used as the back contact.

Original languageEnglish
Pages (from-to)279-285
Number of pages7
JournalMetals and Materials International
Volume5
Issue number3
DOIs
Publication statusPublished - 1999 Jun

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Keywords

  • Back contacts
  • CdTe
  • Electro deposition
  • Solar cells
  • ZnTe

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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