Browsing by Author "Khosropour, A."
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- Characterization of a-Si:H solar cell modules on plastic substrates by high resolution LBIC techniquePublication . Fernandes, Miguel; Vygranenko, Yuri; Vieira, Manuela; Sazonov, Andrei; Yang, R.; Khosropour, A.This article reports on characterization of hydrogenated amorphous silicon (a-Si:H) photovoltaic modules fabricated on 100 mu m thick PEN plastic films. Experimental results show that the shunt leakage is one of the factors reducing the device performance. Current-voltage characteristics of individual a-Si:H p-i-n cells were analysed to estimate a variation of shunt resistances. A SPICE model of the a-Si:H p-i-n cell with local shunt leakage was also developed to analyse the impact of leakage currents on the device performance. Using the LBIC technique, the presence of multiple shunts in the cell was detected. They are attributed to surface defects in plastic foils, which are thermally induced during the device fabrication. (C) 2015 Published by Elsevier Ltd.
- Lightweight amorphous silicon photovoltaic modules on flexible plastic substratePublication . Vygranenko, Yuri; Khosropour, A.; Yang, R.; Sazonov, A.; Kosarev, A.; Abramov, A.; Terukov, E.Solar cells on lightweight and flexible substrates have advantages over glass-or wafer-based photovoltaic devices in both terrestrial and space applications. Here, we report on development of amorphous silicon thin film photovoltaic modules fabricated at maximum deposition temperature of 150 degrees C on 100 mu m thick polyethylene-naphtalate plastic films. Each module of 10 cm x 10 cm area consists of 72 a-Si:H n-i-p rectangular structures with transparent conducting oxide top electrodes with Al fingers and metal back electrodes deposited through the shadow masks. Individual structures are connected in series forming eight rows with connection ports provided for external blocking diodes. The design optimization and device performance analysis are performed using a developed SPICE model.