Cross-Sectional Transport Imaging in a Multijunction Solar Cell

Nancy Haegel, Harvey Guthrey, Chi-Wen Ke, Hesham Taha, C. Fetzer, Richard King

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations


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 languageAmerican English
Number of pages3
StatePublished - 14 Dec 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: 14 Jun 201519 Jun 2015


Conference42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
Country/TerritoryUnited States
CityNew Orleans

Bibliographical note

Publisher Copyright:
© 2015 IEEE.

NREL Publication Number

  • NREL/CP-5K00-63566


  • cathodoluminescence
  • diffusion
  • luminescent coupling
  • multijunction solar cell
  • transport imaging


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