Phase control of CuxTe film and its effects on CdS/CdTe solar cell |
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Authors: | X. Wu J. Zhou Y. Yan S. Asher S. Demtsu R. Noufi |
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Affiliation: | a National Renewable Energy Laboratory (NREL), 1617 Cole Blvd., Golden, CO 80401, USA b Department of Physics, Colorado State University, Fort Collins, CO 80523, USA |
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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. |
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Keywords: | Cadmium telluride Copper telluride Back-contact |
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