Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 91: Poster IIIb (Joint session of DS and HL, organized by HL)

HL 91.18: Poster

Donnerstag, 10. März 2016, 16:00–19:00, Poster A

Energy Band Alignment of Novel p-type Transparent Conducting Oxides on Indium Tin Oxide — Emma Norton, Leo Farrell, Daragh Mullarkey, Igor Shvets, and •Karsten Fleischer — School of Physics and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, University of Dublin, Dublin 2, Ireland

Thin films of p-type Cr₂O₃:Mg have been produced by Molecular Beam Epitaxy (MBE) as well as amorphous, copper deficient p-type Cu_xCrO₂ deposited by a low temperature solution based method (spray pyrolysis). These thin films are deposited on top of commercial n-type Indium Tin Oxide substrate to produce transparent pn junctions. The band alignment of these two interfaces is studied using X-ray Photoelectron Spectroscopy (XPS) and Ultra Violet Photoelectron Spectroscopy (UPS). An estimate of the band discontinuities at the interfaces of ITO/Cr₂O₃:Mg and ITO/a-Cu_xCrO₂ are given. An emphasis is given to the fact that the Fermi level and work function position for both Cr₂O₃:Mg and a-Cu_xCrO₂ show changes with surface preparation and surface termination.