Investigation of cadmium telluride grown by molecular-beam epitaxy using micro-Raman spectroscopy below and above the laser damage threshold
Abstract
The effects of visible laser light on cadmium telluride (CdTe), grown by molecular beam epitaxy, are studied at low (48 μW/μm2) and high (480 μW/μm2) laser power densities using micro-Raman spectroscopy. The Raman spectrum of CdTe shows no notable change at low power density ~48 μW/μm2 for prolonged laser exposure. At higher power density ~480 μW/μm2, the Raman spectrum is significantly changed and strong Te-related peaks appear in the spectrum, even for short laser exposure times suggesting that photo-induced Te enrichment happens at the CdTe surface at high laser power density. The temperature rise is estimated from observed shifts in the Te and CdTe optical phonon peaks and modeled using finite-element simulations. At laser power 480 μW/μm2, the CdTe exhibits a rise of ~44 °C above room temperature while the observed change in Te temperature is significantly higher, ~179 °C. Furthermore, the approach illustrates steps needed to establish the laser damage threshold for CdTe.
- Authors:
-
- Texas State Univ., San Marcos, TX (United States)
- Publication Date:
- Research Org.:
- Texas State Univ., San Marcos, TX (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- OSTI Identifier:
- 1579312
- Alternate Identifier(s):
- OSTI ID: 1469728
- Grant/Contract Number:
- EE0007541
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics
- Additional Journal Information:
- Journal Volume: 36; Journal Issue: 5; Journal ID: ISSN 2166-2746
- Publisher:
- American Vacuum Society/AIP
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Sohal, Sandeep, Edirisooriya, Madhavie, Myers, Thomas, and Holtz, Mark. Investigation of cadmium telluride grown by molecular-beam epitaxy using micro-Raman spectroscopy below and above the laser damage threshold. United States: N. p., 2018.
Web. doi:10.1116/1.5048526.
Sohal, Sandeep, Edirisooriya, Madhavie, Myers, Thomas, & Holtz, Mark. Investigation of cadmium telluride grown by molecular-beam epitaxy using micro-Raman spectroscopy below and above the laser damage threshold. United States. https://doi.org/10.1116/1.5048526
Sohal, Sandeep, Edirisooriya, Madhavie, Myers, Thomas, and Holtz, Mark. Wed .
"Investigation of cadmium telluride grown by molecular-beam epitaxy using micro-Raman spectroscopy below and above the laser damage threshold". United States. https://doi.org/10.1116/1.5048526. https://www.osti.gov/servlets/purl/1579312.
@article{osti_1579312,
title = {Investigation of cadmium telluride grown by molecular-beam epitaxy using micro-Raman spectroscopy below and above the laser damage threshold},
author = {Sohal, Sandeep and Edirisooriya, Madhavie and Myers, Thomas and Holtz, Mark},
abstractNote = {The effects of visible laser light on cadmium telluride (CdTe), grown by molecular beam epitaxy, are studied at low (48 μW/μm2) and high (480 μW/μm2) laser power densities using micro-Raman spectroscopy. The Raman spectrum of CdTe shows no notable change at low power density ~48 μW/μm2 for prolonged laser exposure. At higher power density ~480 μW/μm2, the Raman spectrum is significantly changed and strong Te-related peaks appear in the spectrum, even for short laser exposure times suggesting that photo-induced Te enrichment happens at the CdTe surface at high laser power density. The temperature rise is estimated from observed shifts in the Te and CdTe optical phonon peaks and modeled using finite-element simulations. At laser power 480 μW/μm2, the CdTe exhibits a rise of ~44 °C above room temperature while the observed change in Te temperature is significantly higher, ~179 °C. Furthermore, the approach illustrates steps needed to establish the laser damage threshold for CdTe.},
doi = {10.1116/1.5048526},
journal = {Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics},
number = 5,
volume = 36,
place = {United States},
year = {Wed Sep 12 00:00:00 EDT 2018},
month = {Wed Sep 12 00:00:00 EDT 2018}
}
Web of Science