Numerical Simulations of Time-Resolved Photoluminescence in CdSexTe1-x/CdTe Solar Cells

John Moseley, Dmitry Krasikov, Darius Kuciauskas

Research output: Contribution to conferencePaperpeer-review

4 Scopus Citations


We present initial time-resolved photoluminescence (TRPL) simulations in graded CdSexTe1-e thin-film solar cells to quantify the front-interface recombination velocity, Sint,front. Our model includes several composition dependences: bandgap energy, absorption coefficient, electron affinity, and carrier lifetime. Cathodoluminescence spectrum imaging measurements on bevels provide an estimate of the bandgap and the CdSexTe1-x alloy composition through the absorber thickness. TRPL decays are simulated as a function of the laser power, Sint,front, front-interface band offset, and bulk Shockley-Read-Hall lifetime. We find the impact of Sintf,ront on the PL decay increases as the band offset shifts from a 'spike' to a 'cliff'. Recombination rate analysis shows that back-interface recombination could potentially dictate the later part of the TRPL decay 't2' in high-lifetime CdSexTe1-x cells. We briefly discuss ongoing work to determine TRPL measurement conditions that maximize sensitivity to Sitnt,front.

Original languageAmerican English
Number of pages4
StatePublished - 14 Jun 2020
Event47th IEEE Photovoltaic Specialists Conference, PVSC 2020 - Calgary, Canada
Duration: 15 Jun 202021 Aug 2020


Conference47th IEEE Photovoltaic Specialists Conference, PVSC 2020

Bibliographical note

Publisher Copyright:
© 2020 IEEE.

NREL Publication Number

  • NREL/CP-5K00-75931


  • CdTe solar cells
  • interface recombination
  • time-resolved photoluminescence


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