Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
A number of hybrid CdTe solar cell structures with conductive polymer electrode layer was developed to evaluate the overall performance and compare obtained structures with the structures of standard configuration. Initial glass/ITO/CdS/CdTe photovoltaic structures were prepared using the physical vapor deposition (PVD) technique with following typical activation procedure, which includes annealing of the structures at 430 °C in air in presence of CdCl2.
Conductive layers of polypyrrole doped with sulfonic salts were electrodeposited onto activated CdTe layers in a three-electrode electrochemical cell. It was found, that intensive white light illumination from a xenon lamp facilitates polypyrrole deposition and improves quality of obtained polymer films. Applied technique gives the possibility to deposit the electrode layer strictly onto illuminated photoactive CdTe surface eliminating possible short-circuiting through pinholes and cracks in CdTe layer. Furthermore, relatively low deposition potential values give the possibility to reduce electrochemical degradation of CdTe structures in an electrochemical cell. Resulting polymer electrode layers demonstrate excellent coverage of the CdTe surface, good uniformity and adhesion. It was found, that the photoconversion efficiency of a hybrid cells with polypyrrole electrode layer are comparable with the structures of more expensive conventional configuration.
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