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|Title:||Composition and annealing effects in polythiophene/fullerene solar cells||Authors:||Choulis, Stelios A.
Nelson, Jenny K.
|Keywords:||Solar cells;Fullerenes;Photoluminescence;Atomic force microscopy;Polychlorinated biphenyls||Issue Date:||2005||Publisher:||Springer||Source:||Journal of materials science, 2005, Volume 40, Issue 6, Pages 1371-1376||Abstract:||We have fabricated organic solar cells with blends of regioregular poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6) C 61 (PCBM) as electron donor and electron acceptor, respectively. Blend composition and device annealing effects were investigated with optical absorption and photoluminescence spectroscopy, atomic force microscopy, photocurrent spectroscopy, and current-voltage characteristic measurements on devices under monochromatic or air mass (AM) 1.5 simulated solar light illumination. The highest efficiency was achieved for the 1:1 (P3HT:PCBM) weight ratio composition. The good performance is attributed to an optimized morphology that enables close intermolecular packing of P3HT chains. Inferior performance for the 1:2 composition is attributed to poorer intermolecular packing with increased PCBM content, while phase segregation on a sub-micron scale was observed for the 1:4 composition. The power conversion efficiency (AM 1.5) was doubled by the thermal annealing of devices at 140°C to reach a value of 1.4%||URI:||http://ktisis.cut.ac.cy/handle/10488/7709||ISSN:||0022-2461 (print)
|DOI:||10.1007/s10853-005-0568-0||Rights:||© 2005 Springer Science + Business Media, Inc||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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