Open AccessПоведение доноров фосфора в объемных монокристаллических моноизотопных сплавах -=SUP=-28-=/SUP=-Si-=SUB=-1-x-=/SUB=--=SUP=-72-=/SUP=-Ge-=SUB=-x-=/SUB=-
Author(s) -
А. А. Ежевский,
П. Г. Сенников,
Д. В. Гусейнов,
А.В. Сухоруков,
E. A. Kalinina,
Nikolai V. Abrosimov
Publication year - 2020
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2020.09.49835.27
Subject(s) - germanium , hyperfine structure , electron paramagnetic resonance , isotopes of germanium , isotopes of silicon , silicon , resonance (particle physics) , isotope , crystallography , chemistry , atomic physics , analytical chemistry (journal) , electron , nuclear magnetic resonance , physics , internal conversion , organic chemistry , quantum mechanics , chromatography
The behavior of phosphorus donors in bulk single-crystal monoisotopic Si_1 – _ x Ge_ x alloys ( x = 0.0039–0.05) enriched by zero-spin isotopes ^28Si (99.998%) and ^72Ge (99.984%) by the electron-spin-resonance method is investigated. The hyperfine structure of the donor-electron spectrum giving information on the density of the donor wave function in the ground state on the ^31P nucleus ( I = 1/2) as well as the temperature dependences of the spin-relaxation rate ( T = 3.5–30 K), which make it possible to analyze the longitudinal component T _1 relaxation mechanism and magnitude of the valley–orbit splitting of the donor state, are investigated. Interest in these investigations is also caused by the fact that the Si_1 – _ x Ge_ x alloy enriched by zero-spin isotopes (^28Si^isoGe, iso = 70, 72, 74, 76) is a poorly known material when compared with ^28Si. The irregular arrangement of germanium atoms in the lattice of the SiGe solid solution and local distortions formed by it can level isotopic effects under isotopic enrichment. However, despite broadening of the lines of the electron-spin resonance of donor electrons due to random deformations formed by dissolved germanium atoms in silicon, narrower lines of the spectra of the electron-spin resonance are observed in isotopically pure Si_1 – _ x Ge_ x single crystals at x = 0.39, 1.2, 2.9 at % when compared with similar crystals with the natural composition of silicon and germanium isotopes.