The Effect of Copper on the Sub-Bandgap Density of States of CdTe Solar Cells

Teresa Barnes, Charles Warren, Jiaojiao Li, Colin Wolden, Daniel Meysing, D. Miller, Jennifer Heath, Mark Lonergan

Research output: Contribution to journalArticlepeer-review

14 Scopus Citations

Abstract

Two optical sub-bandgap transitions in CdTe thin-film solar cells have been identified using detailed transient photocapacitance and transient photocurrent spectroscopy measurements. A broad response centered at EV + 0.9 eV directly correlates with the quantity of Cu present in the absorber layer, while a second response at EV + 1.2 eV does not depend on Cu or Zn and may be an intrinsic defect. These results demonstrate the influence of Cu on the sub-bandgap density of states of CdTe, and they are critical to understanding, modeling, and improving its optoelectronic properties.

Original languageAmerican English
Article number203903
Number of pages4
JournalApplied Physics Letters
Volume106
Issue number20
DOIs
StatePublished - 18 May 2015

Bibliographical note

Publisher Copyright:
© 2015 AIP Publishing LLC.

NREL Publication Number

  • NREL/JA-5K00-64598

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