caa a22 4500 388022485 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1557/JMR.1998.0293 doi S0884291400045295 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0293 Precipitates in GaN epilayers grown on sapphire substrates [Elektronische Daten] Precipitates in GaN epilayers grown on sapphire substrates were investigated by atomic number contrast (ANC), wavelength-dispersive x-ray spectrometry (WDS), energy-dispersive spectrometry (EDS), and cathodoluminescence (CL) techniques. The results showed that the precipitates are mainly composed of gallium and oxygen elements and distribute more sparsely and inhomogeneously in directions in the sample grown on substrate nitridated for a longer period. Yellow luminescence intensity was imaged to be stronger in the precipitates. The results suggest that the precipitates are formed on dislocations and grain boundaries by substituting oxygen onto the nitrogen site, and result in the formations of deep levels nearby. Copyright © Materials Research Society 1998 Kang Junyong Department of Physics, Gakushuin University, Mejiro, Tokyo 171, Japan, and Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China Ogawa Tomoya Department of Physics, Gakushuin University, Mejiro, Tokyo 171, Japan Journal of Materials Research Cambridge University Press 13/8(1998-08), 2100-2104 0884-2914 13:8<2100 1998 13 JMR https://doi.org/10.1557/JMR.1998.0293 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0293 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kang Junyong Department of Physics, Gakushuin University, Mejiro, Tokyo 171, Japan, and Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China NATIONALLICENCE 700 1- Ogawa Tomoya Department of Physics, Gakushuin University, Mejiro, Tokyo 171, Japan NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/8(1998-08), 2100-2104 0884-2914 13:8<2100 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge