Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 47, Issue 17, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/47/17/175101
Keywords
thin film solar cell; cross-over; red kink; CZTSe; kesterite
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Current-voltage analysis using different optical band pass filters has been performed on Cu2ZnSnSe4 and Cu2ZnSn(S, Se)(4) thin-film solar cells. When using red or orange light (i.e. wavelengths above 600 nm), a distortion appears in the I-V curve of the Cu2ZnSnSe4 solar cell, indicating an additional potential barrier to the current flow in the device for these conditions of illumination. This barrier is reduced when using a Cu2ZnSn(S, Se)(4) absorber. Numerical simulations demonstrate that the barrier visible under red light could be explained by a positive conduction band offset at the front interface coupled with compensating defects in the buffer layer.
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