H passivation of Li on Zn-site in ZnO: Positron annihilation spectroscopy and secondary ion mass spectrometry

Article

关键词: ZINC-OXIDE;    INFRARED-ABSORPTION;    POINT-DEFECTS;    HYDROGEN;    DONOR;    ACCEPTOR;    LITHIUM;   

DOI  :  10.1103/PhysRevB.84.115203

来源: SCIE

【 摘 要 】

The interaction of hydrogen (H) with lithium (Li) and zinc vacancies (V(Zn)) in hydrothermally grown n-type zinc oxide (ZnO) has been investigated by positron annihilation spectroscopy (PAS) and secondary ion mass spectrometry. Li on Zn-site (Li(Zn)) is found to be the dominant trap for migrating H atoms, while the trapping efficiency of V(Zn) is considerably smaller. After hydrogenation, where the Li(Zn) acceptor is passivated via formation of neutral Li(Zn)-H pairs, V(Zn) occurs as the prime PAS signature and with a concentration similar to that observed in nonhydrogenated Li-poor samples. Despite a low efficiency as an H trap, the apparent concentration of V(Zn) in Li-poor samples decreases after hydrogenation, as detected by PAS, and evidence for formation of the neutral V(Zn)H(2) complex is presented.

【 授权许可】

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