The Influence of Phonon Emission on Electron Transport in Hexagonal and Cubic Gallium Nitride

Autor:	R. Brazis, R. Raguotis
Rok vydání:	2005
Předmět:	Materials science Condensed matter physics Phonon Monte Carlo method General Physics and Astronomy Gallium nitride Electron Electron transport chain Crystal Condensed Matter::Materials Science chemistry.chemical_compound chemistry Phase (matter) Electric field
Zdroj:	Acta Physica Polonica A. 107:324-327
ISSN:	1898-794X 0587-4246
Popis:	Electron transport characteristics of GaN crystals in high electric fields are shown to be essentially influenced by different optical phonon modes inherent to the hexagonal and cubic phases of these compound crystals. Additional optical phonon modes (≈ 26 meV) competing with the higher-energy ones (≈ 92 meV) in hexagonal GaN, together with the low-lying satellite valley (Γ3), dramatically reduce the drift mobility of electrons in comparison with conventional models. Presented Monte Carlo data are in excellent agreement with the time-of-flight experiment. The cubic GaN crystal phase with its satellite electron energy valleys shifted well above the main (Γ1) valley is chosen as a convenient medium for elucidating the role of high-energy longitudinal optical phonon accumulation. A simple efficient one-particle Monte Carlo method is proposed for an account of excess phonons. Phonon heating is shown to bring about the moderate additional reduction of the drift mobility and an increase in mean electron energy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::526e1e6a0b0c409ce75ccebaa382a106 https://doi.org/10.12693/aphyspola.107.324 Zobrazit plný text záznamu