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Indium incorporation in InGaN/GaN quantum wells grown on m-plane GaN substrate and c-plane sapphire
Lai, K. Y., Paskova, T., Wheeler, V. D., Chung, T. Y., Grenko, J. A., Johnson, M. A. L., Udwary, K., Preble, E. A., & Evans, K. R. (2012). Indium incorporation in InGaN/GaN quantum wells grown on m-plane GaN substrate and c-plane sapphire. Physica Status Solidi (A) Applications and Materials Science, 209(3), 559-564. https://doi.org/10.1002/pssa.201127345
InGaN/GaN quantum wells (QWs) grown at identical conditions on m-plane GaN and c-plane sapphire substrates were characterized by several techniques, aiming to clarify the reason for different emission wavelengths often observed in similar LED structures with m- and c-plane surface orientations. Cathodoluminescence (CL) spectra of m-plane QWs revealed shorter wavelength and no blueshift with increasing CL probe current in accordance with previous reports. Relative indium compositions were estimated by high-resolution X-ray diffraction to be 5.1 and 13.9% for m-plane and c-plane QWs, respectively. Cross-sectional transmission electron microscopy images revealed that the well widths of the m-plane QWs were noticeably thicker than those of the c-plane QWs. The lower indium compositions and thicker well widths of the m-plane QWs indicated that different indium incorporation and diffusion occurred in the structures grown on the GaN substrate, which is attributed to its surface off-cut toward [0001] and the higher thermal conductivity with respect to that of sapphire. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
