期刊
JOURNAL OF CRYSTAL GROWTH
卷 289, 期 1, 页码 107-112出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2005.10.129
关键词
diffusion; chemical vapor deposition; GaN; light-emitting diodes
The effect of temperature on the growth of p-GaN on In0.25GaN/GaN multiple quantum well (MQW) in a green light-emitting diode (LED) was investigated. p-GaN was grown at a low temperature of 900 degrees C to prevent the thermal degradation of MQWs in the green LED. A green LED with low-temperature (LT) p-GaN did not show a blue-shift in its electroluminescence (EL) spectrum, which is frequently observed in InGaN/GaN MQW with a high indium content. X-ray diffraction, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy analyses of the MQW showed that the improved structural quality of MQWS with a LT p-GaN can be attributed to the suppression of inter-diffusion and the re-evaporation of indium in the MQW layers. Current-voltage measurement of the pure green LEDs with a LT p-GaN showed a forward voltage of 3.6 V at 20 mA and the peak wavelength and full-width at half-maximum for the EL emission peak were 525 and 25 rim, respectively. (c) 2005 Elsevier B.V. All rights reserved.
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