Carrier relaxation and recombination in an InGaN/GaN quantum well probed with time-resolved cathodoluminescence
نویسندگان
چکیده
Spatially, spectrally, and temporally resolved cathodoluminescence ~CL! techniques have been employed to examine the optical properties and kinetics of carrier relaxation for metalorganic chemical vapor deposition grown InGaN/GaN single quantum wells ~QWs!. Cathodoluminescence wavelength imaging of the QW sample revealed local band gap variations, indicating the presence of local In composition fluctuations and segregation during growth. A detailed time-resolved CL study shows that carriers generated in the boundary regions will diffuse toward and recombine at InN-rich centers, resulting in a strong lateral excitonic localization prior to radiative recombination. © 1998 American Institute of Physics. @S0003-6951~98!03936-9#
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