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Proceedings Paper

Fabrication of bulk heterojunction photovoltaic cells with controlled distribution of p-n components by evaporative spray deposition using ultradilute solution
Author(s): Masato Shakutsui; Tadashi Iwamoto; Ryoji Maeda; Tetsuo Tsutsui; Katsuhiko Fujita
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Paper Abstract

A distribution-controlled bulk heterojunction (dc-BHJ) photovoltaic cell where the distribution of an electron donor and acceptor is controlled across the film was fabricated by Evaporative Spray Deposition using Ultradilute Solution (ESDUS) method, which can build a layered structure of polymer semiconductors soluble in a same solvent, and the energy conversion efficiency, PCE, of the dc-BHJ was significantly improved compared with a conventional BHJ cell. The dc-BHJ cells were fabricated by changing the ratio of a donor, regioregular poly(3-hexyl-thiophene-2,5-diyl) (P3HT), and an acceptor, a fullerene derivative (PCBM), from 2:1 to 1:2. The short circuit current, Jsc, and PCE of a dc-BHJ cell having P3HT-rich BHJ/PCBM-rich BHJ structure was 6.06 mA/cm2 and 2.15 %, respectively, while those of a conventional BHJ cell having P3HT:PCBM=1:1 layer were 5.26 mA/cm2, 1.71 %. In the dc-BHJ cells, the introduction of composition gradient brought about the increase in conversion efficiency. The transportation of photogenerated charge carriers to the collecting electrodes was improved because the better pathways should be formed in the dc-BHJ cells.

Paper Details

Date Published: 3 September 2008
PDF: 6 pages
Proc. SPIE 7052, Organic Photovoltaics IX, 705215 (3 September 2008); doi: 10.1117/12.794319
Show Author Affiliations
Masato Shakutsui, Kyushu Univ. (Japan)
Tadashi Iwamoto, Kyushu Univ. (Japan)
Ryoji Maeda, Kyushu Univ. (Japan)
Tetsuo Tsutsui, Kyushu Univ. (Japan)
Katsuhiko Fujita, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 7052:
Organic Photovoltaics IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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