Structural and optical characterizations of GaN-based green light-emitting diodes growth using TiN buffer layer

C. Y. Shieh, Z. Y. Li, Hao-Chung Kuo, G. C. Chi

研究成果: Conference contribution同行評審

摘要

The present study investigated the structural and optical characterizations of the growth of GaN-based green lightemitting diodes using a TiN buffer layer. The purpose of growing GaN-based green LEDs on the TiN interlayer was to produce the naturally occurring hexagonal pattern structure on the surface of undoped-GaN. Then dislocations of the grown InGaN/GaN MQWs green LEDs structure on the uGaN template with the TiN interlayer produced base plane staking faults through epitaxial lateral overgrowth. Cross-section transmission electron microscope images showed that the dislocation density of green LEDs was decreased from 5 × 108 cm-2 to 7 × 107 cm-2, and that the dislocations in the green LEDs structure were reproduced. The full widths at half maximum of the omega-scan rocking curves in (002) and (102) reflectance on the GaN-based green LEDs were 334 and 488 arcsec, respectively. As the injection current was increased from 5 mA to 40 mA, the electroluminescence peak wavelength of the GaN-based green LEDs was shifted from 508 nm to 481 nm, a blue-shift of 27 nm. The forward voltage measured at an injection current of 20 mA was 4.9 V for the GaN-based green LEDs according to the current-voltage characteristics. Due to an increase in the In mole fraction of the GaN-based green LEDs on the uGaN template with the TiN interlayer, the strain and phase separation were increased, and the multiple quantum wells structural quality and device performances of the GaN-based green LEDs were decayed. A yellow band with a wavelength of 551nm was thereby produced according to room temperature photoluminescence measurement. Meanwhile, cross-section transmission electron microscope images indicated Vdefects in multiple quantum wells structures of the green LEDs.

原文English
主出版物標題Gallium Nitride Materials and Devices VIII
DOIs
出版狀態Published - 12 六月 2013
事件SPIE Symposium on Gallium Nitride Materials and Devices VIII - San Francisco, CA, United States
持續時間: 4 二月 20137 二月 2013

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
8625
ISSN(列印)0277-786X

Conference

ConferenceSPIE Symposium on Gallium Nitride Materials and Devices VIII
國家United States
城市San Francisco, CA
期間4/02/137/02/13

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