期刊
APPLIED PHYSICS LETTERS
卷 77, 期 26, 页码 4344-4346出版社
AMER INST PHYSICS
DOI: 10.1063/1.1334363
关键词
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Photoluminescence and complementary photocurrent spectroscopy, both as a function of electric field, are used to probe carrier capture and escape mechanisms in InAs/GaAs quantum dots. Carrier capture from the GaAs matrix is found to be highly field sensitive, being fully quenched in fields of only 15 kV/cm. For fields less than 20 kV/cm, carriers excited in the wetting layer are shown to be captured by the dots very effectively, whereas for fields in excess of 50 kV/cm tunnel escape from the wetting layer into the GaAs continuum is dominant. For excitation directly into the dots, radiative recombination dominates up to 100 kV/cm. (C) 2000 American Institute of Physics. [S0003-6951(00)02352-4].
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