Determination of Thickness for the Individual Layer of Strained P-Type Al0.11Ga0.89NGaN Superlattice by High Angle Annular Dark Field Scanning Transmission Electron Microscopy

Abstract:

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AlGaN/GaN superlattice are the important structure of optoelectronic devices such as light-emitting diodes and laser diodes. The nanostructure of the superlattice can greatly influences the optical electrical properties of final LD and LED . It is impossible to evaluate their thickness by TEM when it’s aluminum component lower than 14%.We investigated the nanostructure of strained p-type Al0.11Ga0.89N/GaN superlattice grown on sapphire by high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM).By an average filtering technique, the thickness of the AlGaN layers and GaN layers were determined to be 2.409±0.092 nm and 2.371±0.062 nm from the HAADF-STEM images, respectively.

Info:

Periodical:

Advanced Materials Research (Volumes 152-153)

Edited by:

Zhengyi Jiang, Jingtao Han and Xianghua Liu

Pages:

879-882

DOI:

10.4028/www.scientific.net/AMR.152-153.879

Citation:

H. Liao et al., "Determination of Thickness for the Individual Layer of Strained P-Type Al0.11Ga0.89NGaN Superlattice by High Angle Annular Dark Field Scanning Transmission Electron Microscopy", Advanced Materials Research, Vols. 152-153, pp. 879-882, 2011

Online since:

October 2010

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$35.00

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