Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 3, Issue 3, Pages 1095-1099Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2013.2257919
Keywords
Admittance measurement; capacitance-voltage (CV) characteristics; CdTe; charge carrier density; contacts; defect
Funding
- U.S. Department of Energy [DE-AC36-08GO28308]
- National Renewable Energy Laboratory
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We study the effects of Cu composition on the CdTe/ZnTe:Cu back contact and the bulk CdTe. For the back contact, its potential barrier decreases with Cu concentration, while its saturation current density increases. For the bulk CdTe, the hole density increases with Cu concentration. We identify a Cu-related deep level at similar to 0.55 eV whose concentration is significant when the Cu concentration is high. The device performance, which initially improves with Cu concentration then decreases, reflects the interplay between the positive influences (reducing the back-contact potential barrier while increasing the saturation current density of the back contact and hole density in CdTe bulk) and negative influences (increasing deep levels in CdTe) of Cu.
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