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Two-dimensional electron gas related emissions in ZnMgO/ZnO heterostructures

Date

2011-11-22

Authors

Chen, Hui
Gu, Shulin
Liu, Jiagao
Ye, Jiandong
Tang, Kun
Zhu, Shunming
Zheng, Youdou

Journal Title

Journal ISSN

Volume Title

Publisher

American Institute of Physics (AIP)

Abstract

Radiative recombination of two-dimensional electron gas(2DEG), induced by polarization and validated by Hall effect measurements, is investigated in ZnMgO/ZnO heterostructures grown by metal-organic chemical vapor deposition. The Mg composition, the depth profile distribution of Mg, the residual strain in ZnMgO caplayer, and the thickness of caplayer all significantly influence the 2DEG-related transitions in ZnMgO/ZnO heterostructures. Below or above ZnO donor bound exciton, three additional broad emissions persisting up to 100 K are assigned to the spatially indirect transitions from 2DEG electrons to the photoexcited holes towards the ZnO flat-band region or remaining at the heterointerface.

Description

Keywords

Keywords: Depth profile distributions; Donor-bound exciton; Flat band; Hall effect measurement; Hetero interfaces; Indirect transition; Photoexcited holes; Radiative recombination; Residual strains; Two-dimensional electron gas (2DEG); ZnMgO; ZnO; Crystals; Gas emi

Citation

URI

http://hdl.handle.net/1885/70371

Collections

ANU Research Publications

Source

Applied Physics Letters

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1063/1.3662964

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