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Picosecond luminescence approach to vertical transport in GaAs/GaAlAs superlattices

Institution:	1. Fauna Australis Wildlife Conservation Research Laboratory, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Región Metropolitana, Chile;2. Panthera, 8 W 40th St, 18th Floor, New York, NY 10018, USA;3. Programa de Doctorado en Ecosistemas Forestales y Recursos Naturales & Laboratorio de Fauna Silvestre, Instituto de Conservación, Biodiversidad y Territorio, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Casilla 567, Valdivia, Chile;1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;2. Huaian Research Institute, Hohai University, Huaian 223001, China

Abstract:	Picosecond luminescence of GaAs/GaAlAs superlattices has been measured at 5 K. Asymetrical structures where one larger well is introduced at 9000 Å from the surface are studied. It is then possible to estimate the mean transfer time of photoexcited carriers through 9000 Å of superlattice. This time is found to be about 4 nsec in a 40/40 Å superlattice and 800 psec in a 30/30 Å one. This evidences the rather high mobility of small period superlattices in the growth direction.

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