Factors influencing photoluminescence and photocarrier lifetime in CdSeTe/CdMgTe double heterostructures
- Texas State Univ., San Marcos, TX (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
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. Here, 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.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; SunShot Foundational Program to Advance Cell Efficiency II (F-PACE II)
- Grant/Contract Number:
- AC36-08GO28308; DEAC36-08GO28308
- OSTI ID:
- 1333496
- Alternate ID(s):
- OSTI ID: 1420546
- Report Number(s):
- NREL/JA-5K00-67465
- Journal Information:
- Journal of Applied Physics, Vol. 120, Issue 16; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Radiative Efficiency and Charge‐Carrier Lifetimes and Diffusion Length in Polycrystalline CdSeTe Heterostructures
|
journal | December 2019 |
Investigations of the structural, optical properties and electronic structure of CdTe 1− x Se x films fabricated by RF magnetron sputtering
|
journal | March 2019 |
Radiative Efficiency and Charge‐Carrier Lifetimes and Diffusion Length in Polycrystalline CdSeTe Heterostructures
|
journal | January 2020 |
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