Defect Energy Levels in Density Functional Calculations: Alignment and Band Gap Problem

Details Defect Energy Levels in Density Functional Calculations: Alignment and Band Gap Problem Defect Energy Levels in Density Functional Calculations: Alignment and Band Gap Problem

2008-07-29

arxiv.org/abs/0807.4647v1

Phys. Rev. Lett. 101, 046405 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.046405

For materials of varying band gap, we compare energy levels of atomically localized defects calculated within a semilocal and a hybrid density-functional scheme. Since the latter scheme partially relieves the band gap problem, our study describes how calculated defect levels shift when the band gap approaches the experimental value. When suitably aligned, defect levels obtained from total-energy differences correspond closely, showing average shifts of at most 0.2 eV irrespective of band gap. Systematic deviations from ideal alignment increase with the extent of the defect wave function. A guideline for comparing calculated and experimental defect levels is provided.

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