کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1666991 1008837 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optical absorption dependence on composition and thickness of InxGa1 − xN (0.05 < × < 0.22) grown on GaN/sapphire
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Optical absorption dependence on composition and thickness of InxGa1 − xN (0.05 < × < 0.22) grown on GaN/sapphire
چکیده انگلیسی

We report the change in optical absorption properties of InGaN epilayers around the critical layer thickness determined from X-ray diffraction. Detrimental sub-band gap absorption is observed in InGaN thin films grown beyond the critical layer thicknesses, and is caused by localized electric fields around extended crystalline defects and aided by V-defects through light channeling. The photoluminescence response from InGaN thin films, grown beyond the critical layer thickness, is reduced owing to absorption of the incident laser light by non-radiative recombination extended crystalline defects. The formation of V-defects is observed to occur beyond the critical layer thickness and continues to grow in areal coverage aiding in sub-band gap absorption. This optical behavior sets constraints to be incorporated in the design of InGaN solar cell and requirement for improvement in epitaxial growth techniques to reduce V-defects.


► We studied the change in optical absorption of InGaN epilayer with thickness.
► Critical thickness for the optical absorption changes determined by X-ray diffraction.
► The critical thickness reduced with increasing InGaN composition.
► The change in optical absorption is attributed to the creation of V-defects in InGaN.
► The creation of V-defects reduces the photoluminescence intensity of InGaN.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 520, Issue 22, 1 September 2012, Pages 6807–6812
نویسندگان
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