کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1552969 | 1513215 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polarization characteristics of 480-680 nm (1 1 2¯ 2) InGaN/GaN quantum well structures with strain relaxation effects
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
The polarization characteristics as a function of the In composition for semipolar (1 1 2¯ 2) InGaN/GaN quantum well (QW) structures with strain relaxation effects are investigated by using the multiband effective-mass theory. We assumed that the strain relaxation ratio âyâ²yâ²0-âyâ²yâ²/âyâ²yâ²0 is linearly proportional to the difference in the lattice constants between the well and the substrate. The energy spacing between the first two subbands increases with increasing In composition, and the average hole effective mass of the first subband is reduced for a QW structure with a larger In composition. The [1¯1¯ 2 3] xâ²-polarized matrix elements are shown to be much larger than the [1 1¯ 0 0] yâ²-polarized matrix elements. As a result, the xâ²-polarized light emission is shown to be dominant and a weak function of the In composition. On the other hand, the light emission for yâ²-polarizations rapidly decreases with increasing In composition, mainly due to a decrease in the matrix elements. Thus, the absolute value of the polarization ratio rapidly increases with increasing transition wavelength.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 86, October 2015, Pages 531-535
Journal: Superlattices and Microstructures - Volume 86, October 2015, Pages 531-535
نویسندگان
Seoung-Hwan Park,