Cross-Sectional Transport Imaging in a Multijunction Solar Cell

Nancy M. Haegel; Chi Wen Ke; Hesham Taha; Harvey Guthrey; Christopher M. Fetzer; Richard R. King

doi:10.1109/JPHOTOV.2016.2623088

Cross-Sectional Transport Imaging in a Multijunction Solar Cell

Nancy M. Haegel, Chi Wen Ke, Hesham Taha, Harvey Guthrey, Christopher M. Fetzer, Richard R. King

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We combine a highly localized electron-beam point source excitation to generate excess free carriers with the spatial resolution of optical near-field imaging to map recombination in a cross-sectioned multijunction (Ga_0.5In_0.5P/GaIn_0.01As/Ge) solar cell. By mapping the spatial variations in emission of light for fixed generation (as opposed to traditional cathodoluminescence (CL), which maps integrated emission as a function of position of generation), it is possible to directly monitor the motion of carriers and photons. We observe carrier diffusion throughout the full width of the middle (GaInAs) cell, as well as luminescent coupling from point source excitation in the top cell GaInP to the middle cell. Supporting CL and near-field photoluminescence (PL) measurements demonstrate the excitation-dependent Fermi level splitting effects that influence cross-sectioned spectroscopy results, as well as transport limitations on the spatial resolution of conventional cross-sectional far-field measurements.

Original language	English (US)
Article number	7762750
Pages (from-to)	354-358
Number of pages	5
Journal	IEEE Journal of Photovoltaics
Volume	7
Issue number	1
DOIs	https://doi.org/10.1109/JPHOTOV.2016.2623088
State	Published - Jan 2017
Externally published	Yes

Keywords

Cathodoluminescence (CL)
diffusion
luminescent coupling
multijunction solar cell
transport imaging

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/JPHOTOV.2016.2623088

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title = "Cross-Sectional Transport Imaging in a Multijunction Solar Cell",

abstract = "We combine a highly localized electron-beam point source excitation to generate excess free carriers with the spatial resolution of optical near-field imaging to map recombination in a cross-sectioned multijunction (Ga0.5In0.5P/GaIn0.01As/Ge) solar cell. By mapping the spatial variations in emission of light for fixed generation (as opposed to traditional cathodoluminescence (CL), which maps integrated emission as a function of position of generation), it is possible to directly monitor the motion of carriers and photons. We observe carrier diffusion throughout the full width of the middle (GaInAs) cell, as well as luminescent coupling from point source excitation in the top cell GaInP to the middle cell. Supporting CL and near-field photoluminescence (PL) measurements demonstrate the excitation-dependent Fermi level splitting effects that influence cross-sectioned spectroscopy results, as well as transport limitations on the spatial resolution of conventional cross-sectional far-field measurements.",

keywords = "Cathodoluminescence (CL), diffusion, luminescent coupling, multijunction solar cell, transport imaging",

author = "Haegel, {Nancy M.} and Ke, {Chi Wen} and Hesham Taha and Harvey Guthrey and Fetzer, {Christopher M.} and King, {Richard R.}",

note = "Funding Information: National Science Foundation under Grant DMR-0804527 Publisher Copyright: {\textcopyright} 2011-2012 IEEE.",

year = "2017",

month = jan,

doi = "10.1109/JPHOTOV.2016.2623088",

language = "English (US)",

volume = "7",

pages = "354--358",

journal = "IEEE Journal of Photovoltaics",

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T1 - Cross-Sectional Transport Imaging in a Multijunction Solar Cell

AU - Haegel, Nancy M.

AU - Ke, Chi Wen

AU - Taha, Hesham

AU - Guthrey, Harvey

AU - Fetzer, Christopher M.

AU - King, Richard R.

PY - 2017/1

Y1 - 2017/1

N2 - We combine a highly localized electron-beam point source excitation to generate excess free carriers with the spatial resolution of optical near-field imaging to map recombination in a cross-sectioned multijunction (Ga0.5In0.5P/GaIn0.01As/Ge) solar cell. By mapping the spatial variations in emission of light for fixed generation (as opposed to traditional cathodoluminescence (CL), which maps integrated emission as a function of position of generation), it is possible to directly monitor the motion of carriers and photons. We observe carrier diffusion throughout the full width of the middle (GaInAs) cell, as well as luminescent coupling from point source excitation in the top cell GaInP to the middle cell. Supporting CL and near-field photoluminescence (PL) measurements demonstrate the excitation-dependent Fermi level splitting effects that influence cross-sectioned spectroscopy results, as well as transport limitations on the spatial resolution of conventional cross-sectional far-field measurements.

AB - We combine a highly localized electron-beam point source excitation to generate excess free carriers with the spatial resolution of optical near-field imaging to map recombination in a cross-sectioned multijunction (Ga0.5In0.5P/GaIn0.01As/Ge) solar cell. By mapping the spatial variations in emission of light for fixed generation (as opposed to traditional cathodoluminescence (CL), which maps integrated emission as a function of position of generation), it is possible to directly monitor the motion of carriers and photons. We observe carrier diffusion throughout the full width of the middle (GaInAs) cell, as well as luminescent coupling from point source excitation in the top cell GaInP to the middle cell. Supporting CL and near-field photoluminescence (PL) measurements demonstrate the excitation-dependent Fermi level splitting effects that influence cross-sectioned spectroscopy results, as well as transport limitations on the spatial resolution of conventional cross-sectional far-field measurements.

KW - Cathodoluminescence (CL)

KW - diffusion

KW - luminescent coupling

KW - multijunction solar cell

KW - transport imaging

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JO - IEEE Journal of Photovoltaics

JF - IEEE Journal of Photovoltaics

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M1 - 7762750

ER -

Cross-Sectional Transport Imaging in a Multijunction Solar Cell

Abstract

Keywords

ASJC Scopus subject areas

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