Abstract
Combining highly localized electron-beam excitation at a point with the spatial resolution capability of optical near-field imaging, we have imaged carrier transport in a cross-sectioned multijunction (GaInP/GaInAs/Ge) solar cell. We image energy transport associated with carrier diffusion throughout the full width of the middle (GaInAs) cell and luminescent coupling from point excitation in the top cell GaInP to the middle cell. Supporting cathodoluminescence and near-field photoluminescence measurements demonstrate excitation-dependent Fermi level splitting effects that influence cross-sectioned spectroscopy results as well as transport limitations on the spatial resolution of cross-sectional measurements.
Original language | American English |
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Number of pages | 3 |
DOIs | |
State | Published - 14 Dec 2015 |
Event | 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States Duration: 14 Jun 2015 → 19 Jun 2015 |
Conference
Conference | 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 |
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Country/Territory | United States |
City | New Orleans |
Period | 14/06/15 → 19/06/15 |
Bibliographical note
Publisher Copyright:© 2015 IEEE.
NREL Publication Number
- NREL/CP-5K00-63566
Keywords
- cathodoluminescence
- diffusion
- luminescent coupling
- multijunction solar cell
- transport imaging