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Cross-Sectional Transport Imaging in a Multijunction Solar Cell

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Author
Haegel, Nancy M.
Ke, Chi-Wen
Taha, Hesham
Guthrey, Harvey
Fetzer, Christopher M
King, Richard R.
Date
2017
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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 carri- ers 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) measure- ments 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.
Description
IEEE Journal of Photovoltaics
 
 
The article of record as published may be found at http://dx.doi.org/10.1109/jphotov.2016.2623088
 
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/52391
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