Ultralow interface recombination velocity (∼1 cm/s) in CdTe/MgxCd1-xTe double-heterostructures

Xin Hao Zhao; Shi Liu; Calli M. Campbell; Yuan Zhao; Maxwell B. Lassise; Yong-Hang Zhang

doi:10.1109/PVSC.2016.7750047

Ultralow interface recombination velocity (∼1 cm/s) in CdTe/Mg_xCd_1-xTe double-heterostructures

Xin Hao Zhao, Shi Liu, Calli M. Campbell, Yuan Zhao, Maxwell B. Lassise, Yong-Hang Zhang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Scopus citations

Abstract

CdTe/Mg_xCd_1-xTe double heterostructures (DHs) grown on InSb (001) substrates using molecular beam epitaxy have demonstrated very long carrier lifetime and low interface recombination velocity (IRV) due to the effective carrier confinement and surface passivation provided by Mg_xCd_1-xTe. However, both thermionic emission and tunneling effects can cause carrier loss over or through the Mg_xCd_1-xTe barriers when the barrier potential is low or when the barrier is thin. Thus carrier lifetime measurement can only give an effective IRV, which consists of the actual IRV that is purely due to recombination through interface trap states, and carrier loss due to thermionic emission and tunneling. By conducting temperature dependent carrier lifetime measurements, the thermionic emission induced interface recombination can be distinguished. Also by comparing samples with different barrier layer thicknesses, the contribution to effective IRV from tunneling effect can be quantified. When both thermionic emission and tunneling effects are eliminated, the actual IRV is measured to be ∼1 cm/s and a very long carrier lifetime of 3.6 μs is observed.

Original language	English (US)
Title of host publication	2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	2302-2305
Number of pages	4
ISBN (Electronic)	9781509027248
DOIs	https://doi.org/10.1109/PVSC.2016.7750047
State	Published - Nov 18 2016
Event	43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 - Portland, United States Duration: Jun 5 2016 → Jun 10 2016

Publication series

Name	Conference Record of the IEEE Photovoltaic Specialists Conference
Volume	2016-November
ISSN (Print)	0160-8371

Other

Other	43rd IEEE Photovoltaic Specialists Conference, PVSC 2016
Country/Territory	United States
City	Portland
Period	6/5/16 → 6/10/16

Keywords

Carrier Lifetime
CdTe
Interface Recombination Velocity
MBE
Solar Cell

ASJC Scopus subject areas

Control and Systems Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

Access to Document

10.1109/PVSC.2016.7750047

Cite this

Zhao, X. H., Liu, S., Campbell, C. M., Zhao, Y., Lassise, M. B., & Zhang, Y-H. (2016). Ultralow interface recombination velocity (∼1 cm/s) in CdTe/Mg_xCd_1-xTe double-heterostructures. In 2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016 (pp. 2302-2305). [7750047] (Conference Record of the IEEE Photovoltaic Specialists Conference; Vol. 2016-November). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2016.7750047

Ultralow interface recombination velocity (∼1 cm/s) in CdTe/Mg_xCd_1-xTe double-heterostructures. / Zhao, Xin Hao; Liu, Shi; Campbell, Calli M. et al.

2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016. Institute of Electrical and Electronics Engineers Inc., 2016. p. 2302-2305 7750047 (Conference Record of the IEEE Photovoltaic Specialists Conference; Vol. 2016-November).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Zhao, XH, Liu, S, Campbell, CM, Zhao, Y, Lassise, MB & Zhang, Y-H 2016, Ultralow interface recombination velocity (∼1 cm/s) in CdTe/Mg_xCd_1-xTe double-heterostructures. in 2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016., 7750047, Conference Record of the IEEE Photovoltaic Specialists Conference, vol. 2016-November, Institute of Electrical and Electronics Engineers Inc., pp. 2302-2305, 43rd IEEE Photovoltaic Specialists Conference, PVSC 2016, Portland, United States, 6/5/16. https://doi.org/10.1109/PVSC.2016.7750047

Zhao XH, Liu S, Campbell CM, Zhao Y, Lassise MB, Zhang Y-H. Ultralow interface recombination velocity (∼1 cm/s) in CdTe/Mg_xCd_1-xTe double-heterostructures. In 2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016. Institute of Electrical and Electronics Engineers Inc. 2016. p. 2302-2305. 7750047. (Conference Record of the IEEE Photovoltaic Specialists Conference). https://doi.org/10.1109/PVSC.2016.7750047

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abstract = "CdTe/MgxCd1-xTe double heterostructures (DHs) grown on InSb (001) substrates using molecular beam epitaxy have demonstrated very long carrier lifetime and low interface recombination velocity (IRV) due to the effective carrier confinement and surface passivation provided by MgxCd1-xTe. However, both thermionic emission and tunneling effects can cause carrier loss over or through the MgxCd1-xTe barriers when the barrier potential is low or when the barrier is thin. Thus carrier lifetime measurement can only give an effective IRV, which consists of the actual IRV that is purely due to recombination through interface trap states, and carrier loss due to thermionic emission and tunneling. By conducting temperature dependent carrier lifetime measurements, the thermionic emission induced interface recombination can be distinguished. Also by comparing samples with different barrier layer thicknesses, the contribution to effective IRV from tunneling effect can be quantified. When both thermionic emission and tunneling effects are eliminated, the actual IRV is measured to be ∼1 cm/s and a very long carrier lifetime of 3.6 μs is observed.",

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author = "Zhao, {Xin Hao} and Shi Liu and Campbell, {Calli M.} and Yuan Zhao and Lassise, {Maxwell B.} and Yong-Hang Zhang",

note = "Funding Information: This work was supported in part by the Department of Energy (DOE) FPACE II program under Contract DEAC36- 08GO28308, DOE/Bay Area Photovoltaic Consortium program under Award DEEE0004946, and the Air Force Office of Scientific Research under Grant FA9550-12-1-0444 Publisher Copyright: {\textcopyright} 2016 IEEE.; 43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 ; Conference date: 05-06-2016 Through 10-06-2016",

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N2 - CdTe/MgxCd1-xTe double heterostructures (DHs) grown on InSb (001) substrates using molecular beam epitaxy have demonstrated very long carrier lifetime and low interface recombination velocity (IRV) due to the effective carrier confinement and surface passivation provided by MgxCd1-xTe. However, both thermionic emission and tunneling effects can cause carrier loss over or through the MgxCd1-xTe barriers when the barrier potential is low or when the barrier is thin. Thus carrier lifetime measurement can only give an effective IRV, which consists of the actual IRV that is purely due to recombination through interface trap states, and carrier loss due to thermionic emission and tunneling. By conducting temperature dependent carrier lifetime measurements, the thermionic emission induced interface recombination can be distinguished. Also by comparing samples with different barrier layer thicknesses, the contribution to effective IRV from tunneling effect can be quantified. When both thermionic emission and tunneling effects are eliminated, the actual IRV is measured to be ∼1 cm/s and a very long carrier lifetime of 3.6 μs is observed.

AB - CdTe/MgxCd1-xTe double heterostructures (DHs) grown on InSb (001) substrates using molecular beam epitaxy have demonstrated very long carrier lifetime and low interface recombination velocity (IRV) due to the effective carrier confinement and surface passivation provided by MgxCd1-xTe. However, both thermionic emission and tunneling effects can cause carrier loss over or through the MgxCd1-xTe barriers when the barrier potential is low or when the barrier is thin. Thus carrier lifetime measurement can only give an effective IRV, which consists of the actual IRV that is purely due to recombination through interface trap states, and carrier loss due to thermionic emission and tunneling. By conducting temperature dependent carrier lifetime measurements, the thermionic emission induced interface recombination can be distinguished. Also by comparing samples with different barrier layer thicknesses, the contribution to effective IRV from tunneling effect can be quantified. When both thermionic emission and tunneling effects are eliminated, the actual IRV is measured to be ∼1 cm/s and a very long carrier lifetime of 3.6 μs is observed.

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