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The structural and optical properties of GaSb/InGaAs type-II quantum dots grown on InP (100) substrate.


ABSTRACT: We have investigated the structural and optical properties of type-II GaSb/InGaAs quantum dots [QDs] grown on InP (100) substrate by molecular beam epitaxy. Rectangular-shaped GaSb QDs were well developed and no nanodash-like structures which could be easily found in the InAs/InP QD system were formed. Low-temperature photoluminescence spectra show there are two peaks centered at 0.75eV and 0.76ev. The low-energy peak blueshifted with increasing excitation power is identified as the indirect transition from the InGaAs conduction band to the GaSb hole level (type-II), and the high-energy peak is identified as the direct transition (type-I) of GaSb QDs. This material system shows a promising application on quantum-dot infrared detectors and quantum-dot field-effect transistor.

SUBMITTER: Shuhui Z 

PROVIDER: S-EPMC3278347 | biostudies-literature | 2012 Jan

REPOSITORIES: biostudies-literature

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The structural and optical properties of GaSb/InGaAs type-II quantum dots grown on InP (100) substrate.

Shuhui Zhang Z   Lu Wang W   Zhenwu Shi S   Yanxiang Cui C   Haitao Tian T   Huaiju Gao G   Haiqiang Jia J   Wenxin Wang W   Hong Chen C   Liancheng Zhao Z  

Nanoscale research letters 20120125 1


We have investigated the structural and optical properties of type-II GaSb/InGaAs quantum dots [QDs] grown on InP (100) substrate by molecular beam epitaxy. Rectangular-shaped GaSb QDs were well developed and no nanodash-like structures which could be easily found in the InAs/InP QD system were formed. Low-temperature photoluminescence spectra show there are two peaks centered at 0.75eV and 0.76ev. The low-energy peak blueshifted with increasing excitation power is identified as the indirect tra  ...[more]

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