We have studied experimentally the radiative lifetimes of negatively charged excitons (X-) and neutral excitons (X) in GaAs and CdTe quantum wells. Despite the different optical properties (e.g. trion binding energies) and the different quantum well structures of the studied samples, we find quite similar X- lifetimes in the range of 45 to 60 ps. On the other side, the X lifetimes are very different and influenced by the material. For relatively low electron concentrations, the X- lifetime is found to be constant with increasing temperature in a given range. This time behaviour of X- suggests that X- is localised for low electron concentrations in the CdTe QW.
Title
Radiative lifetime of negative trions in GaAs and CdTe quantum wells
Published in
Physica Status Solidi a-Applied Research
Volume
178
Issue
1
Pages
495-499
Date
2000
ISSN
0031-8965
Note
Swiss Fed Inst Technol, EPFL, IMO, Dept Phys, CH-1015 Lausanne, Switzerland. Univ Metz, Inst Phys & Elect, F-57078 Metz 3, France. Ciulin, V, Swiss Fed Inst Technol, EPFL, IMO, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 303TG
Cited Reference Count: 13
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Record creation date
2007-08-31