Electrical and Optical Properties of n-Type Indium-Doped CdTe/Mg0.46Cd0.54Te Double Heterostructures
Abstract
CdTe/Mg0.46 Cd0.54 Te double heterostructures with n-type In doping concentrations, varied from 1 × 1016 to 7 × 1018 cm-3, have been grown on InSb substrates using molecular beam epitaxy. Secondary ion mass spectroscopy measurements show strong diffusion of In from the InSb substrate to the CdTe buffer layer, while the In concentration is constant in the CdTe layer between the two Mg0.46 Cd0.54 Te barrier layers. Capacitance–voltage measurements show that the dopants are 100% ionized for the doping concentration range from 1 × 1016 to 1 × 1018 cm-3. Additionally, the carrier lifetime decreases with increasing doping concentration (from 0.73 μs for an unintentionally doped sample to 0.74 ns for a 1 × 1018 cm-3 doped sample) due to the decrease of both radiative and nonradiative lifetimes. Decent carrier lifetimes are achieved (~100 ns) between 1 × 1016 and 1 × 1017 cm-3 doping levels, which is beneficial for developing n-type monocrystalline CdTe solar cells, photodetectors, and other optoelectronic devices. Lastly, the strongest photoluminescence intensity is observed when the doping concentration is 1 × 1017 cm-3, which corresponds to the highest internal quantum efficiency.
- Authors:
-
- Arizona State Univ., Tempe, AZ (United States)
- Publication Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- OSTI Identifier:
- 1579863
- Grant/Contract Number:
- EE0004946; AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- IEEE Journal of Photovoltaics
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 2156-3381
- Publisher:
- IEEE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 14 SOLAR ENERGY; Carrier lifetime; CdTe; doping; MgxCd1-xTe; molecular beam epitaxy (MBE); solar cells
Citation Formats
Zhao, Xin-Hao, Liu, Shi, Zhao, Yuan, Campbell, Calli M., Lassise, Maxwell B., Kuo, Ying-Shen, and Zhang, Yong-Hang. Electrical and Optical Properties of n-Type Indium-Doped CdTe/Mg0.46Cd0.54Te Double Heterostructures. United States: N. p., 2016.
Web. doi:10.1109/JPHOTOV.2016.2514742.
Zhao, Xin-Hao, Liu, Shi, Zhao, Yuan, Campbell, Calli M., Lassise, Maxwell B., Kuo, Ying-Shen, & Zhang, Yong-Hang. Electrical and Optical Properties of n-Type Indium-Doped CdTe/Mg0.46Cd0.54Te Double Heterostructures. United States. https://doi.org/10.1109/JPHOTOV.2016.2514742
Zhao, Xin-Hao, Liu, Shi, Zhao, Yuan, Campbell, Calli M., Lassise, Maxwell B., Kuo, Ying-Shen, and Zhang, Yong-Hang. Mon .
"Electrical and Optical Properties of n-Type Indium-Doped CdTe/Mg0.46Cd0.54Te Double Heterostructures". United States. https://doi.org/10.1109/JPHOTOV.2016.2514742. https://www.osti.gov/servlets/purl/1579863.
@article{osti_1579863,
title = {Electrical and Optical Properties of n-Type Indium-Doped CdTe/Mg0.46Cd0.54Te Double Heterostructures},
author = {Zhao, Xin-Hao and Liu, Shi and Zhao, Yuan and Campbell, Calli M. and Lassise, Maxwell B. and Kuo, Ying-Shen and Zhang, Yong-Hang},
abstractNote = {CdTe/Mg0.46 Cd0.54 Te double heterostructures with n-type In doping concentrations, varied from 1 × 1016 to 7 × 1018 cm-3, have been grown on InSb substrates using molecular beam epitaxy. Secondary ion mass spectroscopy measurements show strong diffusion of In from the InSb substrate to the CdTe buffer layer, while the In concentration is constant in the CdTe layer between the two Mg0.46 Cd0.54 Te barrier layers. Capacitance–voltage measurements show that the dopants are 100% ionized for the doping concentration range from 1 × 1016 to 1 × 1018 cm-3. Additionally, the carrier lifetime decreases with increasing doping concentration (from 0.73 μs for an unintentionally doped sample to 0.74 ns for a 1 × 1018 cm-3 doped sample) due to the decrease of both radiative and nonradiative lifetimes. Decent carrier lifetimes are achieved (~100 ns) between 1 × 1016 and 1 × 1017 cm-3 doping levels, which is beneficial for developing n-type monocrystalline CdTe solar cells, photodetectors, and other optoelectronic devices. Lastly, the strongest photoluminescence intensity is observed when the doping concentration is 1 × 1017 cm-3, which corresponds to the highest internal quantum efficiency.},
doi = {10.1109/JPHOTOV.2016.2514742},
journal = {IEEE Journal of Photovoltaics},
number = 2,
volume = 6,
place = {United States},
year = {Mon Jan 18 00:00:00 EST 2016},
month = {Mon Jan 18 00:00:00 EST 2016}
}
Web of Science