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Photoemission study on the formation of Mo contacts to CuInSe2

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6 Author(s)
Nelson, A.J. ; National Renewable Energy Laboratory, Golden, Colorado 80401 ; Niles, D.W. ; Kazmerski, L.L. ; Rioux, D.
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Synchrotron radiation soft‐x‐ray photoemission spectroscopy was used to investigate the development of the electronic structure at the Mo/CuInSe2 interface. Mo overlayers were e‐beam deposited in steps on single‐crystal n‐type CuInSe2 at ambient temperature. Photoemission measurements were acquired after each growth in order to observe changes in the valence‐band electronic structure as well as changes in the In 4d, Se 3d, and Mo 4d core lines. Photoemission measurements on the valence‐band and core lines were also obtained after annealing. The results were used to correlate the interface chemistry with the electronic structure at this interface and to directly determine the maximum possible Schottky barrier height ϕb to be ≤0.2 eV at the Mo/CuInSe2 junction before annealing, thus showing that this contact is essentially ohmic.

Published in:

Journal of Applied Physics  (Volume:72 ,  Issue: 3 )

Date of Publication:

Aug 1992

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