X-ray spectroscopic studies of the electronic structure of chromium-based p-type transparent conducting oxides
File Type:
PDFItem Type:
Journal ArticleDate:
2016Author:
Access:
openAccessCitation:
E. Norton, L. Farrell, S. D. Callaghan, C. McGuinness, I. V. Shvets and K. Fleischer, X-ray spectroscopic studies of the electronic structure of chromium-based p-type transparent conducting oxides, Physical Review B, 93, 2016, 115302-Download Item:
PhysRevB.93.115302.pdf (PDF) 1.256Mb
Abstract:
The valence band structure of p-type transparent oxides—crystalline MgxCr2−xO3 and nanocrystalline CuxCrOy—is analyzed as a function of incoming photon energy. The valence band of both p-type transparent conducting oxides shows striking similarities to measurements on crystalline CuCrO2:Mg with all films showing that chromium states compose the top of the valence band, suggesting that the valence-band structure is dominated by the presence of the Cr-O6 octahedra. A comparison of the valence band between the best performing p-type, crystalline CuCrO2:Mg, with crystalline MgxCr2−xO3 and nanocrystalline CuxCrOy shows that the chromium 3d states are fixed irrespective of changes in long-range crystallographic order. This indicates little spatial overlap between adjacent Cr 3d states. This further confirms the conduction mechanism via hopping for chromium based p-type TCOs as the Cr 3d states are localized within the Cr-O6 octahedra.
Sponsor
Grant Number
Irish Research Council (IRC)
GOI/PG/2013/445
European Union Framework Programme 7 (FP7)
312284
Science Foundation Ireland (SFI)
12/IA/1264
Higher Education Authority (HEA) PRTLI-5 postgraduate award
Author's Homepage:
http://people.tcd.ie/fleisckhttp://people.tcd.ie/cmcguin
http://people.tcd.ie/ivchvets
http://people.tcd.ie/nortonem
http://people.tcd.ie/lefarrel
http://people.tcd.ie/scallagh
Description:
PUBLISHED
Author: FLEISCHER, KARSTEN; NORTON, EMMA; CALLAGHAN, STEPHEN; MCGUINNESS, CORMAC; FARRELL, LEO; SHVETS, IGOR
Type of material:
Journal ArticleCollections:
Series/Report no:
Physical Review B;93;
Availability:
Full text availableLicences: