Phase Control of CuxTe Film and Its Effects on CdS/CdTe Solar Cell

X. Wu, J. Zhou, A. Duda, Y. Yan, G. Teeter, S. Asher, W. K. Metzger, S. Demtsu, Su Huai Wei, R. Noufi

Research output: Contribution to journalArticlepeer-review

149 Scopus Citations

Abstract

Phase control is critical for achieving high-performance CdTe cells when CuxTe is used as a back-contact for CdTe cells. CuxTe phases are mainly controlled by the Cu/Te ratio, and they can also be affected by post-heat-treatment temperature. Although Cu2Te has the highest conductivity, it is unstable and provides more Cu diffusion into the CdS and CdTe films. Cu diffusion into the CdS causes "cross-over", and Cu diffusion into the CdTe film creates Cu-related defects that lower photogenerated carrier lifetime and result in voltage-dependent collection. A "recontact" experiment clearly indicated that the mechanism giving rise to "roll-over" is the formation of Cu-related oxides, rather than the loss of Cu on the back-contact.

Original languageAmerican English
Pages (from-to)5798-5803
Number of pages6
JournalThin Solid Films
Volume515
Issue number15
DOIs
StatePublished - 2007

NREL Publication Number

  • NREL/JA-520-40021

Keywords

  • Back-contact
  • Cadmium telluride
  • Copper telluride

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