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Title: Spatial Resolution Versus Data Acquisition Efficiency in Mapping an Inhomogeneous System with Species Diffusion

Abstract

Traditionally, spatially-resolved photoluminescence (PL) has been performed using a point-by-point scan mode with both excitation and detection occurring at the same spatial location. But with the availability of high quality detector arrays like CCDs, an imaging mode has become popular for performing spatially-resolved PL. By illuminating the entire area of interest and collecting the data simultaneously from all spatial locations, the measurement efficiency can be greatly improved. However, this new approach has proceeded under the implicit assumption of comparable spatial resolution. We show here that when carrier diffusion is present, the spatial resolution can actually differ substantially between the two modes, with the less efficient scan mode being far superior. We apply both techniques in investigation of defects in a GaAs epilayer – where isolated singlet and doublet dislocations can be identified. A superposition principle is developed for solving the diffusion equation to extract the intrinsic carrier diffusion length, which can be applied to a system with arbitrarily distributed defects. The understanding derived from this work is significant for a broad range of problems in physics and beyond (for instance biology) – whenever the dynamics of generation, diffusion, and annihilation of species can be probed with either measurement mode.

Authors:
 [1];  [2];  [3];  [3];
+ Show Author Affiliations
  1. Univ. of North Carolina, Charlotte, NC (United States); Wuhan Univ. of Technology (China)
  2. Univ. of North Carolina, Charlotte, NC (United States)
  3. Davidson College, Davidson, NC (United States)
Publication Date:
Research Org.:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1220781
Report Number(s):
NREL/JA-5200-64575
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Related Information: Scientific Reports; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; semiconductors; optical spectroscopy

Citation Formats

Chen, Fengxiang, Zhang, Yong, Gfroerer, T. H., Finger, A. N., and Mark W. Wanlass. Spatial Resolution Versus Data Acquisition Efficiency in Mapping an Inhomogeneous System with Species Diffusion. United States: N. p., 2015. Web. doi:10.1038/srep10542.
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Chen, Fengxiang, Zhang, Yong, Gfroerer, T. H., Finger, A. N., & Mark W. Wanlass. Spatial Resolution Versus Data Acquisition Efficiency in Mapping an Inhomogeneous System with Species Diffusion. United States. https://doi.org/10.1038/srep10542
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Chen, Fengxiang, Zhang, Yong, Gfroerer, T. H., Finger, A. N., and Mark W. Wanlass. Tue . "Spatial Resolution Versus Data Acquisition Efficiency in Mapping an Inhomogeneous System with Species Diffusion". United States. https://doi.org/10.1038/srep10542. https://www.osti.gov/servlets/purl/1220781.
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@article{osti_1220781,
title = {Spatial Resolution Versus Data Acquisition Efficiency in Mapping an Inhomogeneous System with Species Diffusion},
author = {Chen, Fengxiang and Zhang, Yong and Gfroerer, T. H. and Finger, A. N. and Mark W. Wanlass},
abstractNote = {Traditionally, spatially-resolved photoluminescence (PL) has been performed using a point-by-point scan mode with both excitation and detection occurring at the same spatial location. But with the availability of high quality detector arrays like CCDs, an imaging mode has become popular for performing spatially-resolved PL. By illuminating the entire area of interest and collecting the data simultaneously from all spatial locations, the measurement efficiency can be greatly improved. However, this new approach has proceeded under the implicit assumption of comparable spatial resolution. We show here that when carrier diffusion is present, the spatial resolution can actually differ substantially between the two modes, with the less efficient scan mode being far superior. We apply both techniques in investigation of defects in a GaAs epilayer – where isolated singlet and doublet dislocations can be identified. A superposition principle is developed for solving the diffusion equation to extract the intrinsic carrier diffusion length, which can be applied to a system with arbitrarily distributed defects. The understanding derived from this work is significant for a broad range of problems in physics and beyond (for instance biology) – whenever the dynamics of generation, diffusion, and annihilation of species can be probed with either measurement mode.},
doi = {10.1038/srep10542},
journal = {Scientific Reports},
number = ,
volume = 5,
place = {United States},
year = {Tue Jun 02 00:00:00 EDT 2015},
month = {Tue Jun 02 00:00:00 EDT 2015}
}
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https://doi.org/10.1038/srep10542
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