Why Increased CdSeTe Charge Carrier Lifetimes and Radiative Efficiencies did not Result in Voltage Boost for CdTe Solar Cells: Article No. 2301784

Darius Kuciauskas, Marco Nardone, Alexandra Bothwell, David Albin, Carey Reich, Chungho Lee, Eric Colegrove

Research output: Contribution to journalArticlepeer-review

4 Scopus Citations

Abstract

After a focused effort over the last decade, order-of-magnitude improvements in doping and electro-optical characteristics (radiative efficiency, carrier lifetime, and passivation) have been reported for polycrystalline CdSeTe solar cells. Surprisingly, this did not result in higher solar cell voltages regardless of device contacting layers, absorber grading profiles, and other changes in device architecture. From detailed evaluation of radiative emission and carrier dynamics in CdSeTe heterostructures and devices, it is shown that the complexity introduced to the absorber to achieve lifetime and passivation metrics resulted in charge carrier trapping, which now negatively affects CdSeTe absorbers.
Original languageAmerican English
Number of pages13
JournalAdvanced Energy Materials
Volume13
Issue number35
DOIs
StatePublished - 2023

NREL Publication Number

  • NREL/JA-5900-86561

Keywords

  • CdTe
  • characterization
  • thin film solar cells
  • voltage loss analysis

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