Ab initio calculation of carrier mobility in semiconductors including ionized-impurity scattering
Journal Article
·
· Physical Review. B
- Univ. of Texas, Austin, TX (United States); OSTI
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Texas, Austin, TX (United States)
The past decade has seen the emergence of ab initio computational methods for calculating phonon-limited carrier mobilities in semiconductors with predictive accuracy. More realistic calculations ought to take into account additional scattering mechanisms such as, for example, impurity and grain-boundary scattering. Here, in this paper, we investigate the effect of ionized-impurity scattering on the carrier mobility. We model the analytical impurity potential parameterized from first principles by a collection of randomly distributed Coulomb scattering centers, and we include this relaxation channel into the ab initio Boltzmann transport equation, as implemented in the EPW code. We demonstrate this methodology by considering silicon, silicon carbide, and gallium phosphide, for which detailed experimental data are available. Our calculations agree well with experiments over a broad range of temperatures and impurity concentrations. For each compound investigated here, we compare the relative importance of electron-phonon scattering and ionized-impurity scattering, and we critically assess the reliability of Matthiessen's rule. We also show that an accurate description of dielectric screening and carrier effective masses can improve quantitative agreement with experiments.
- Research Organization:
- Univ. of California, Oakland, CA (United States); Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-05CH11231; SC0020129
- OSTI ID:
- 2421435
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 107; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ab initio electron mobility and polar phonon scattering in GaAs
Electron-phonon drag enhancement of transport properties from a fully coupled ab initio Boltzmann formalism
Efficient ab initio calculations of electron-defect scattering and defect-limited carrier mobility
Journal Article
·
Sun Nov 27 19:00:00 EST 2016
· Physical Review B
·
OSTI ID:1535797
Electron-phonon drag enhancement of transport properties from a fully coupled ab initio Boltzmann formalism
Journal Article
·
Mon Dec 14 19:00:00 EST 2020
· Physical Review. B
·
OSTI ID:1853459
Efficient ab initio calculations of electron-defect scattering and defect-limited carrier mobility
Journal Article
·
Wed Mar 27 20:00:00 EDT 2019
· Physical Review Materials
·
OSTI ID:1529975