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Published online by Cambridge University Press: 28 February 2011
Rapid thermal processing (RTP) has been applied to improve the versatility of metalorganic chemical vapor deposition (MOCVD). We have demonstrated a new pulsed growth method which yields enhanced layer thickness control and abrupt interfaces (2–4 atomic layers) while maintaining a high growth rate (10Å/sec). In this technique, substrate temperature is used as a switch to control the growth of epitaxial layers. The unfocused tungsten halogen lamps used in RTP have also facilitated a novel thermal precracking technique, producing the best GaAs ever grown using trimethylarsenic (TMAs). Background doping is reduced by a factor of 5, and carbon incorporation is reduced by a factor of 10 or more. Net background doping below 1016 cm−3 and room temperature electron mobilities of 4000 to 4500 cm2/V. sec have been obtained.