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1997 Fiscal Year Final Research Report Summary

Electrochomicel Processing of II-VI Group Semiconductor Cempound

Research Project

Project/Area Number 08455347
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

FUKUNAKA Yasuhiro  Dept.of ENERGY SCIENCE & TECHNOLOGY Associate Professor, エネルギー科学研究科, 助教授 (60111936)

Project Period (FY) 1996 – 1997
KeywordsCompound Semiconductor / Electrochemical Processing / Electrodeposition Mechanism / Calcogenite / Induced Codeposition / solas Cell
Research Abstract

CdTe alloy film was potentiostatically electrodeposited on a rotating disk electrode. The effects of overpotentia1, pH and sometimes HTeO_2^+ concentration or temperature were examined over wide range of electrolytic conditions. The deviation from stoichiometry was not always negligible. When the electrolysis was conducted at 60゚C, CdTe compound semiconductor film was obtained in electrolyte of pH=l.6 and 2 at eta= 33OmV.At 80゚C, pH region was shifted to pH=l and 1.5. The preferred orientation of CdTe film was the (111) plane. A significant induced codeposition phenomena for Cd was observed at pH=1. It was, moreover, noticed that the existence of HTeO_2^+ ion at the cathode surface hindered the hydrogen gas bubble evolution rate.
From the phenomenological similarity between the amorphous film electrodeposition of metal/metalloid system and the semiconductor film of metal/chalcogen system, the adsorption mechanism was applied. The ionic mass transfer rate was calculated to estimate the surface concentrations of various species. The composition of electrodeposited CdTe film was reasonably correlated with the calculated surface concentration of HteO_2^+ ion. These experiments suggested that the surface diffusion rate of metal incorporated into the crystal lattice must be accommodated at an appropriate rate by the existence of adsorbed species, when the microstructure film is electrochemically processed.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Y.Fukunaka: "Ionic Mass Transfer Rate Associated with Elecbodeposition of CdTe Film" Proc.3rd Int. Sym. Electricleucally Deposited Thin Films. 96-19. 103-114 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Fukunaka: "Ionis Mass Transfer Rates Associated With Notural Convection along a Vertial Plane Ante Measued by Two-Waveleigth Holographic Interfecomfer" J.Electrochem.Soc.145. 3814-3820 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Fukunaka: "Measurement of Diffisisty of HTeO_2 ^+Ion in CdSO_4 Solution" in preparation.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Fukunaka, S.Iyuo, Z.Asaki and Y.Nakahiro: "Ionic Mass Transfer Rate Hsaociatel with Electrodeposition of CdTe Film" Proc.Int.Symp.on Electrochemically Depated Thin Filnis. Vol.96-19. 103-114 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Fukunaka, Y.Nakamura and Y.Konishi: "Ionic Mass-Transfer Rates associated with Natural-Convection alenga Plaue Vertical Anode Measured by Two-Wavelongth Holographic Interferemety" J.Electrochem.Soc.vol.145. 3814-3820 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Fukunaka, T.Ikejiri and E.Kusaka: "Measuremert of Diffusiuity of HTeo^+_ Ion in CdSO_4 Solution" (preparation).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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