4 March 2013 Numerical analysis of using superlattice-AlGaN/InGaN as electron blocking layer in green InGaN light-emitting diodes
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Abstract
In this study, a specific design on the electron blocking layer (EBL) by band engineering is investigated numerically with an aim to improve the output performance and to reduce the efficiency droop in green LEDs. Systematic analyses including the energy band diagrams, carrier distributions in the active region, and electron leakage current are given and the simulation results show that the proposed lattice-compensated superlattice-AlGaN/InGaN EBL can provide better optical and electrical output performances when compared to the conventional rectangular AlGaN EBL. The output power of the green LED can be enhanced by a factor of 52% and the applied voltage can be reduced from 5.08 V to 4.53 V at an injection current of 1500 mA. The internal quantum efficiency is improved and the percentage of the efficiency droop can also be reduced from 58% to 37%, which is mainly attributed to the successful suppression of electron leakage current and improvement in hole injection efficiency.
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Fang-Ming Chen, Fang-Ming Chen, Bo-Ting Liou, Bo-Ting Liou, Yi-An Chang, Yi-An Chang, Jih-Yuan Chang, Jih-Yuan Chang, Yih-Ting Kuo, Yih-Ting Kuo, Yen-Kuang Kuo, Yen-Kuang Kuo, } "Numerical analysis of using superlattice-AlGaN/InGaN as electron blocking layer in green InGaN light-emitting diodes", Proc. SPIE 8625, Gallium Nitride Materials and Devices VIII, 862526 (4 March 2013); doi: 10.1117/12.2003681; https://doi.org/10.1117/12.2003681
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