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標題: High-efficiency InGaN-based light-emitting diodes with nanoporous GaN : Mg structure
作者: Lin, C.F.
Zheng, J.H.
Yang, Z.J.
Dai, J.J.
Lin, D.Y.
Chang, C.Y.
Lai, Z.X.
Hong, C.S.
關鍵字: porous gan
期刊/報告no:: Applied Physics Letters, Volume 88, Issue 8.
摘要: In this research nanoporous structures on p-type GaN:Mg and n-type GaN:Si surfaces were fabricated through a photoelectrochemical (PEC) oxidation and an oxide-removing process. The photoluminescence (PL) intensities of GaN and InGaN/GaN multi-quantum-well (MQW) structures were enhanced by forming this nanoporous structure to increase light extraction efficiency. The PL emission peaks of an MQW active layer have a blueshift phenomenon from 465.5 nm (standard) to 456.0 nm (nanoporous) measured at 300 K which was caused by partially releasing the compressive strain from the top GaN:Mg layers. The internal quantum efficiency could be increased by a partial strain release that induces a lower piezoelectric field in the active layer. The thermal activation energy of a nanoporous structure (85 meV) is higher than the standard one (33 meV) from a temperature dependent PL measurement. The internal quantum efficiency and light extraction efficiency of an InGaN/GaN MQW active layer are significantly enhanced by this nanoporous GaN:Mg surface, and this PEC treated nanoporous structure is suitable for high-power lighting applications. (c) 2006 American Institute of Physics.
ISSN: 0003-6951
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