Conference proceeding
Carrier Dynamics and Photoluminescence in Antimony-Doped CdTe and CdSeTe
Conference record of the IEEE Photovoltaic Specialists Conference, pp 0944-0946
09 Jun 2024
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Arsenic (As)-doped graded Cd(Se, Te) photovoltaics have achieved record efficiency of 22.4%, but further increases in efficiency have been limited by doping activation of only ≈1% and radiative voltage losses of ≈100 meV. Antimony (Sb) can also act as a p-type dopant of Cd(Se,Te) but has received relatively little attention. We measured carrier dynamics and photoluminescence of Sb-doped CdTe and CdSeTe films grown by vapor-transport deposition, with dopant activation up to ≈20%. Time resolved terahertz (TRTS) and photoluminescence (TRPL) data were fit by simulating the semiconductor equations, revealing bulk lifetimes of >20 ns in CdTe:Sb and >65 ns in CdSeTe:Sb and surface recombination velocities <1000 cm/s at alumina interfaces. We also qualitatively compare transients and PL spectra of doped and undoped films, with no apparent variation associated with hole concentrations up to 10 15 cm -3 . Preliminary variable temperature steady state photoluminescence (VT-SSPL) indicates dominant band-gap emission in CdSeTe:Sb and no evidence of potential fluctuations with Sb-doping up to this hole concentration.
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Details
- Title
- Carrier Dynamics and Photoluminescence in Antimony-Doped CdTe and CdSeTe
- Creators
- Gregory A. Manoukian - Drexel UniversityCalvin Fai - University of FloridaBin Du - University of DelawareWilliam N. Shafarman - University of FloridaCharles J. Hages - University of FloridaJason B. Baxter - Drexel University
- Publication Details
- Conference record of the IEEE Photovoltaic Specialists Conference, pp 0944-0946
- Publisher
- IEEE
- Number of pages
- 3
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:001447426900330
- Scopus ID
- 2-s2.0-85211611209
- Other Identifier
- 991022202488804721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Energy & Fuels
- Engineering, Electrical & Electronic
- Optics
- Physics, Applied