METASTABLE VACANCY IN THE EL2 DEFECT IN GAAS STUDIED BY POSITRON-ANNIHILATION SPECTROSCOPIES

被引：46

作者：

SAARINEN, K ^{[1
]}

KUISMA, S ^{[1
]}

HAUTOJARVI, P ^{[1
]}

CORBEL, C ^{[1
]}

LEBERRE, C ^{[1
]}

机构：

[1] CENS,INST NATL SCI & TECH NUCL,F-91191 GIF SUR YVETTE,FRANCE

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.49.8005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed positron-lifetime and Doppler-broadening experiments before and after illumination of undoped semi-insulating GaAs with 0.7-1.5-eV photons. When the EL2 defect is transformed to the metastable state by 1.1-1.3-eV photons, we observe a metastable vacancy defect. Its concentration is proportional to the EL2 concentration. The metastable vacancy has smaller open volume than isolated Ga and As vacancies and it is connected to a negative charge. The vacancy is generated with an optical cross section of 2 X 10(-18) cm2 at the photon energy of 1.15 eV and it recovers at 120 K. As these properties are identical to those of the metastable state of EL2, we conclude that the observed vacancy is involved in its atomic configuration. The results are in good agreement with the isolated As antisite model for the structure of the EL2 defect.

引用

页码：8005 / 8016

页数：12

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