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NCUEIR > College of Science > Graduate Institute of Photonics Technologies > Periodical Articles > Item 987654321/13130

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/13130

Title:	Optimization of the Active-Layer Structure for the Deep-UV AlGaN Light-Emitting Diodes
Authors:	Huang, Man-Fang;Lu, Tsung-Hung
Contributors:	光電科技研究所
Keywords:	AlGaN;Band structure;Carrier distribution;Light-emitting diode (LED);Numerical simulation;Polarization effect
Date:	2006-08
Issue Date:	2012-08-07T06:17:34Z
Publisher:	IEEE
Abstract:	The dependence of the active-layer structure on the performance of the deep-UV AlGaN light-emitting diodes (LEDs) was theoretically investigated with an APSYS simulation program. Several structure parameters such as well width, well number, barrier height, barrier width, and doping type were employed to study howthese parameters change the band structures as well as the carrier distributions. The band offset and bowing parameter used in the theoretical analysis were extracted from the experimental results. Theoretical analysis shows that the nonuniform carrier distributions as well as the low hole concentrations, which caused by polarization-induced tilted band structures, play important roles in improving the performance of the AlGaN LEDs. Compensating this asymmetric band structure and increasing the hole density are the important keys to improve the AlGaN LED performance. Numerical simulation results suggest that the higher output power can be obtained when the active layer consists of only one quantum well with a width of 1–3 nm and two thicker n-doped barriers with a small Al composition.
Relation:	IEEE Journal of Quantum Electronics, 42(8): 820-826
Appears in Collections:	[Graduate Institute of Photonics Technologies] Periodical Articles

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