Microscopy Visualization of Carrier Transport in CdSeTe/CdTe Solar Cells

Chuanxiao Xiao, Chun Sheng Jiang, Marco Nardone, David Albin, Adam Danielson, Amit H. Munshi, Tushar Shimpi, Walajabad Sampath, Sean Jones, Mowafak M. Al-Jassim, Glenn Teeter, Nancy M. Haegel, Helio R. Moutinho

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations


Solar cells are essentially minority carrier devices, and it is therefore of central importance to understand the pertinent carrier transport processes. Here, we advanced a transport imaging technique to directly visualize the charge motion and collection in the direction of relevant carrier transport and to understand the cell operation and degradation in state-of-the-art cadmium telluride solar cells. We revealed complex carrier transport profiles in the inhomogeneous polycrystalline thin-film solar cell, with the influence of electric junction, interface, recombination, and material composition. The pristine cell showed a unique dual peak in the carrier transport light intensity decay profile, and the dual peak feature disappeared on a degraded cell after light and heat stressing in the lab. The experiments, together with device modeling, suggested that selenium diffusion plays an important role in carrier transport. The work opens a new forum by which to understand the carrier transport and bridge the gap between atomic/nanometer-scale chemical/structural and submicrometer optoelectronic knowledge.

Original languageAmerican English
Pages (from-to)39976-39984
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number35
StatePublished - 7 Sep 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

NREL Publication Number

  • NREL/JA-5K00-81865


  • carrier transport
  • CdSeTe
  • CdTe
  • interface
  • microscopy
  • recombination
  • solar cell


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