Abstract
The large error of the DFT+U method on full-filled shell metal oxides is due to the residue of self-energy from the localized d orbitals of cations and p orbitals of the anions. U parameters are selfconsistently found to achieve the analytical self-energy cancellation. The improved band structures based on relaxed lattices of Cu2O are shown based on minimization of self-energy error. The experimentally reported intrinsic p-type trap levels are contributed by both Cu-vacancy and the O-interstitial defects in Cu2O. The latter defect has the lowest formation energy but contributes a deep hole trap level while the Cuvacancy has higher energy cost but acting as a shallow acceptor. Both present single-particle levels spread over nearby the valence band edge, consistent to the trend of defects transition levels. By this calculation approach, we also elucidated the entanglement of strong p-d orbital coupling to unravel the screened Coulomb potential of fully filled shells.
Original language | English |
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Pages (from-to) | 49-53 |
Number of pages | 5 |
Journal | Solid State Communications |
Volume | 230 |
DOIs | |
Publication status | Published - 1 Mar 2016 |
Externally published | Yes |
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry