Pt/Indium tin oxide ohmic contacts to arsenic-doped p-type ZnO layers

Sang Ho Kim, Jeong Tae Maeng, Chel Jong Choi, Jae Hyeon Leem, Myung Soo Han, Tae Yeon Seong

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Abstract

We report on the formation of ohmic contacts to As-doped ZnO layers using a Pt/indium tin oxide (ITO) scheme. The As-doped ZnO layer shows p-type conductivity with carrier concentrations of 5.12-9.74×1016 cm-3 when annealed at 25-400°C for 1 min in nitrogen ambient. However, the ZnO layers exhibit n-type characteristics with carrier concentration ca.1018-ca.1019 cm-3 when annealed at 500-800°C. The Pt/ITO contacts produce contact resistivities of 8.0×10-4 - 3.5×10-3 Ω cm2 upon annealing at 300-600°C. Possible ohmic formation mechanisms for the Pt/ITO contacts to the As-doped ZnO layers are described and discussed.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume8
Issue number7
DOIs
Publication statusPublished - 2005 Aug 16
Externally publishedYes

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ASJC Scopus subject areas

  • Electrochemistry
  • Materials Science(all)

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