NDLI: Well-width dependence of the emission linewidth in ZnO/MgZnO quantum wells

Content Provider	PubMed Central
Author	Lv, Xue-qin Zhang, Jiang-yong Ying, Lei-ying Liu, Wen-jie Hu, Xiao-long Zhang, Bao-ping Qiu, Zhi-ren Kuboya, Shigeyuki Onabe, Kentaro
Copyright Year	2012
Abstract	Photoluminescence (PL) spectra were measured as a function of well width (L W) and temperature in ZnO/Mg0.1Zn0.9O single quantum wells (QWs) with graded thickness. The emission linewidth (full width at half maximum) was extracted from the emission spectra, and its variation as a function of L W was studied. The inhomogeneous linewidth obtained at 5 K was found to decrease with increasing L W from 1.8 to 3.3 nm due to the reduced potential variation caused by the L W fluctuation. Above 3.3 nm, however, the linewidth became larger with increasing L W, which was explained by the effect related with defect generation due to strain relaxation and exciton expansion in the QW. For the homogenous linewidth broadening, longitudinal optical (LO) phonon scattering and impurity scattering were taken into account. The LO phonon scattering coefficient Γ LO and impurity scattering coefficient Γ imp were deduced from the temperature dependence of the linewidth of the PL spectra. Evident reduction of Γ LO with decreasing L W was observed, which was ascribed to the confinement-induced enhancement of the exciton binding energy. Different from Γ LO, a monotonic increase in Γ imp was observed with decreasing L W, which was attributed to the enhanced penetration of the exciton wave function into the barrier layers.
Related Links	http://dx.doi.org/10.1186/1556-276x-7-605
Starting Page	605
File Format	PDF
ISSN	1556276X
e-ISSN	1556276X
Journal	Nanoscale Research Letters
Issue Number	1
Volume Number	7
Language	English
Publisher	Springer
Publisher Date	2012-01-01
Access Restriction	Open
Rights Holder	Springer
Subject Keyword	Materials Science(all) Condensed Matter Physics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics

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