Back to Search
Start Over
Factors influencing photoluminescence and photocarrier lifetime in CdSeTe/CdMgTe double heterostructures
- Source :
- Journal of Applied Physics. 120:165305
- Publication Year :
- 2016
- Publisher :
- AIP Publishing, 2016.
-
Abstract
- CdSeTe/CdMgTe double heterostructures were produced with both n-type and unintentionally doped absorber layers. Measurements of the dependence of photoluminescence intensity on excitation intensity were carried out, as well as measurements of time-resolved photoluminescence decay after an excitation pulse. It was found that decay times under very low photon injection conditions are dominated by a non-radiative Shockley-Read-Hall process described using a recombination center with an asymmetric capture cross section, where the cross section for holes is larger than that for electrons. As a result of the asymmetry, the center effectively extends photoluminescence decay by a hole trapping phenomenon. A reduction in electron capture cross section appeared at doping densities over 1016cm−3. An analysis of the excitation intensity dependence of room temperature photoluminescence revealed a strong relationship with doping concentration. This allows estimates of the carrier concentration to be made through a non-destructive optical method. Iodine was found to be an effective n-type dopant for CdTe, allowing controllable carrier concentrations without an increased rate of non-radiative recombination.
- Subjects :
- 010302 applied physics
Materials science
Photoluminescence
Dopant
Electron capture
Doping
General Physics and Astronomy
Heterojunction
02 engineering and technology
Carrier lifetime
021001 nanoscience & nanotechnology
01 natural sciences
Condensed Matter::Materials Science
0103 physical sciences
Photoluminescence excitation
Atomic physics
0210 nano-technology
Excitation
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 120
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........fe39bb8f8e08c07d9a3aaa929854be65