Band Bending at CdTe Solar Cell Contacts: Correlating Electro-Optical and X-Ray Photoelectron Spectroscopy Analyses of Thin Film Solar Cells

Darius Kuciauskas, Craig Perkins, Marco Nardone, Chungho Lee, Rajni Mallick, Gang Xiong

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

With the semiconductor bulk properties reaching target values for highly efficient solar cells, efforts are applied to reduce losses at solar cell interfaces and contacts. Advances in understanding back contacts in thin-film polycrystalline CdTe solar cells, a leading thin-film PV technology, are reported. By using X-Ray photoelectron spectroscopy, Kelvin probe spectroscopy, time- and energy-resolved photoluminescence, defects at the back contact are analyzed. Densities of recombination centers and charged defects that induce near-back-contact band bending, both resulting in recombination losses, were estimated. Electro-optical and surface analysis results are integrated into a device model, simulating the performance of CdSeTe/CdTe solar cells with 902 mV open circuit voltage.

Original languageAmerican English
Article number2300073
Number of pages11
JournalSolar RRL
Volume7
Issue number10
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Solar RRL published by Wiley-VCH GmbH.

NREL Publication Number

  • NREL/JA-5900-85204

Keywords

  • characterization
  • charge carrier lifetime
  • contacts
  • device modeling
  • photoluminescence
  • thin film solar cells
  • X-ray photoelectron spectroscopy

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