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Title: Excitation-Dependent Carrier lifetime and Diffusion Length in Bulk CdTe Determined by Time-Resolved Optical Pump-Probe Techniques.

Abstract

We applied time-resolved pump-probe spectroscopy based on free carrier absorption and light diffraction on a transient grating for direct measurements of the carrier lifetime and diffusion coefficient D in high-resistivity single crystal CdTe (codoped with In and Er). The bulk carrier lifetime t decreased from 670 +/-50 ns to 60 +/- 10 ns with increase of excess carrier density N from 10^16 to 5 x 10^18 cm-3 due to the excitation-dependent radiative recombination rate. In this N range, the carrier diffusion length dropped from 14 um to 6 um due to lifetime decrease. Modeling of in-depth (axial) and in-plane (lateral) carrier diffusion provided the value of surface recombination velocity S = 6 x 10^5 cm/s for the untreated surface. At even higher excitations, in the 10^19-3 x 10^20 cm-3 density range, D increase from 5 to 20 cm^2/s due to carrier degeneracy was observed.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [3];  [3];  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Vilnius University
  3. Washington State University
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1419412
Report Number(s):
NREL/JA-5900-70419
DOE Contract Number:
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 123; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; semiconductors; pump probe experiments; optical properties; electrical properties; light defraction

Citation Formats

Kuciauskas, Darius, Scajev, Patrik, Miasojedovas, Saulius, Mekys, Algirdas, Lynn, Kelvin G., Swain, Santosh K., and Jarasiunas, Kestutis. Excitation-Dependent Carrier lifetime and Diffusion Length in Bulk CdTe Determined by Time-Resolved Optical Pump-Probe Techniques.. United States: N. p., 2018. Web. doi:10.1063/1.5010780.
Kuciauskas, Darius, Scajev, Patrik, Miasojedovas, Saulius, Mekys, Algirdas, Lynn, Kelvin G., Swain, Santosh K., & Jarasiunas, Kestutis. Excitation-Dependent Carrier lifetime and Diffusion Length in Bulk CdTe Determined by Time-Resolved Optical Pump-Probe Techniques.. United States. doi:10.1063/1.5010780.
Kuciauskas, Darius, Scajev, Patrik, Miasojedovas, Saulius, Mekys, Algirdas, Lynn, Kelvin G., Swain, Santosh K., and Jarasiunas, Kestutis. 2018. "Excitation-Dependent Carrier lifetime and Diffusion Length in Bulk CdTe Determined by Time-Resolved Optical Pump-Probe Techniques.". United States. doi:10.1063/1.5010780.
@article{osti_1419412,
title = {Excitation-Dependent Carrier lifetime and Diffusion Length in Bulk CdTe Determined by Time-Resolved Optical Pump-Probe Techniques.},
author = {Kuciauskas, Darius and Scajev, Patrik and Miasojedovas, Saulius and Mekys, Algirdas and Lynn, Kelvin G. and Swain, Santosh K. and Jarasiunas, Kestutis},
abstractNote = {We applied time-resolved pump-probe spectroscopy based on free carrier absorption and light diffraction on a transient grating for direct measurements of the carrier lifetime and diffusion coefficient D in high-resistivity single crystal CdTe (codoped with In and Er). The bulk carrier lifetime t decreased from 670 +/-50 ns to 60 +/- 10 ns with increase of excess carrier density N from 10^16 to 5 x 10^18 cm-3 due to the excitation-dependent radiative recombination rate. In this N range, the carrier diffusion length dropped from 14 um to 6 um due to lifetime decrease. Modeling of in-depth (axial) and in-plane (lateral) carrier diffusion provided the value of surface recombination velocity S = 6 x 10^5 cm/s for the untreated surface. At even higher excitations, in the 10^19-3 x 10^20 cm-3 density range, D increase from 5 to 20 cm^2/s due to carrier degeneracy was observed.},
doi = {10.1063/1.5010780},
journal = {Journal of Applied Physics},
number = 2,
volume = 123,
place = {United States},
year = 2018,
month = 1
}