Which material is best for back contact in CdTe device to get the high efficiency.
Tellurium is one natural choice of back contact, as the element is already present in the CdTe absorber. The melting point is much lower than CdTe at around 450°C. Tellurium is a (bulk) p-type degenerate semiconductor with reasonably high conductivity that can be increased by doping (copper) and has a low VBO to CdTe.
limiting the open-circuit voltage (VOC) and fill factor (FF) of CdTe solar cells. To overcome this issue, copper (Cu) is commonly used to improve the conductivity of CdTe and reduce the back-barrier height.
Dear Deepak Suthar ,
The metal that can be used making good ohmic contact to CdTe is copper or carbon paste.
- There are also other solutions as: Back contacts Wet process (chemical pre-treatments + HgTe -doped graphite) Dry process (ion-beam treatment + ZnTe:Cu/Ti) Alternative contact processes such as Cu/Au, CuTe, and SbTe - please follow the link:https://www.nrel.gov/pv/cadmium-telluride-solar-cells.htm
- Best wishes
Dear Deepak Suthar just in case that this interesting technical question is still relevant to you: Please have a look at the following potentially useful article which might help you in your analysis:
Development of ZnTe as a back contact material for thin film cadmium telluride solar cells
Article Development of ZnTe as a back contact material for thin film...
Fortunately this paper is freely accessible as public full text so that you can download it as pdf file.
Please also check out the following interesting paper in which copper thiocyanate (CuSCN) has been suggested as back contact in CdTe devices:
CuSCN as the Back Contact for Ecient ZMO/CdTe Solar Cells
This paper has been published Open Access (see attached pdf file).
Good luck with your work!
Hi Dr Deepak Suthar . Copper (Cu) is commonly used to improve the conductivity of CdTe and reduce the back-barrier height. So the efficiency will be increased .
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