Oxygen Incorporation During Fabrication of Substrate CdTe Photovoltaic Devices: Preprint

Research output: Contribution to conferencePaper


Recently, CdTe photovoltaic (PV) devices fabricated in the nonstandard substrate configuration have attracted increasing interest because of their potential compatibility with flexible substrates such as metal foils and polymer films. This compatibility could lead to the suitability of CdTe for roll-to-roll processing and building-integrated PV. Currently, however, the efficiencies of substrateCdTe devices reported in the literature are significantly lower (6%-8%) than those of high-performance superstrate devices (17%) because of significantly lower open-circuit voltage (Voc) and fill factor (FF). In our recent device development efforts, we have found that processing parameters required to fabricate high-efficiency substrate CdTe PV devices differ from those necessary fortraditional superstrate CdTe devices. Here, we investigate how oxygen incorporation in the CdTe deposition, CdCl2 heat treatment, CdS deposition, and post-deposition heat treatment affect device characteristics through their effects on the junction. By adjusting whether oxygen is incorporated during these processing steps, we have achieved Voc values greater than 860 mV and efficiencies greaterthan 10%.
Original languageAmerican English
Number of pages7
StatePublished - 2012
Event2012 IEEE Photovoltaic Specialists Conference - Austin, Texas
Duration: 3 Jun 20128 Jun 2012


Conference2012 IEEE Photovoltaic Specialists Conference
CityAustin, Texas

NREL Publication Number

  • NREL/CP-5200-54104


  • cadmium compounds
  • current-voltage characteristics
  • devices
  • heterojunctions
  • II-VI semiconductor materials
  • photovoltaic cells
  • solar energy
  • thin film


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