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Transparent and highly conductive films of ZnO prepared by rf reactive magnetron sputtering

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3 Author(s)
Webb, J.B. ; Division of Chemistry (Solid State Semiconductor Group), National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6 CanadaSolar Energy Project, National Research Council, Montreal Road, Ottawa, K1A OR6 Canada ; Williams, D.F. ; Buchanan, M.

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Highly conductive films of zinc oxide have been prepared by reactive rf magnetron sputtering from an oxide target. Film conductivities ranging from ∼10-8 Ω-1 cm-1 to 5×102 Ω-1 cm-1 can be obtained depending on the sputter conditions. Films with sheet resistivities of 85 Ω/⧠ showed little absorption and ∼90% transmission between λ = 4000→8000 Å. A second low power discharge at the substrate is used to initiate growth of the highly conducting material on room‐temperature substrates. Thus, during the deposition of insultating ZnO, turning on this second discharge causes the deposition to ’’switch’’ from low conductivity to high conductivity material. This is of particular interest in the fabrication of semiconductor‐insulator‐semiconductor solar cells where precise control over the thickness of the insulating layer is necessary and where a highly transparent and conductive window‐junction layer is required.

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Applied Physics Letters  (Volume:39 ,  Issue: 8 )