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11 September 2008 High-efficiency large area flexible organic solar cells
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We report on the realization of high-efficiency bulk heterojunction PV devices based on P3HT/PCBM on transparent plastic substrates, from one elementary cell to large area modules, and we compare with results obtained on glass. The first target consists in the optimisation of the processing parameters in order to obtain the highest possible Power Conversion Efficiency (PCE) values for individual cells. We have reached PCE close to 4% with small dispersion on plastic substrates for cells of 0.28 cm2 active area, compared to 5% on glass. Modules of multiple cells are then elaborated on 5x5 cm substrates with a design aimed to minimize ohmic losses, and interconnection resistances. For glass module, with 12 individual cells on a 5x5 cm2 substrate we obtain PCE of 3.26 % (12.4 cm2 active surface). Larger modules with active area up to 35 cm2 exhibiting PCE of 2.8 % and open circuit voltage higher than 6V are also demonstrated for glass, approaching the requirements for commercial electronic applications. On PET, record efficiency of 2.85 % is obtained for a 8.8 cm2 module and PCE of 2.52 % is demonstrated for a large area module with 53 cm2 active surface. The influence of the geometric parameters of the individual cells and their type of connection (parallel or series) on the module characteristics is also discussed.
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Noëlla Lemaitre, Rémi de Bettignies, Séverine Bailly, Pascal Maisse, Stéphane Cros, and Stéphane Guillerez "High-efficiency large area flexible organic solar cells", Proc. SPIE 7047, Nanoscale Photonic and Cell Technologies for Photovoltaics, 70470K (11 September 2008);

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