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Proceedings Paper

Spray deposited PTB7:PC71BM organic polymer solar cells for efficient power generation
Author(s): Shizuyasu Ochiai; Palanisamy Kumar; Kannappan Santhakumar; Leona Saitoh; Kenzo Kojima; Paik-Kyun Shin
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Paper Abstract

Organic solar cell (OSC) materials have recently gained rich attention due to capable of efficient power conversion, cost-effective, mechanically flexible and light weight solar cells. At the same time further materials developments for high performance will be necessary for commercial production of organic photovoltaics. The increase of efficiency has resulted from the low band gab materials, combination of polymer: fullerene and presence of blend micro structure. In this regard, the authors have achieved an efficient polymer solar cells based on Poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]thiophenediyl](PTB7) and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) as donor and acceptor respectively. The photocurrent active layers were fabricated by spray coating technique which enables large area, low cost solar cells. A systematic analysis of PTB7:PC71BM devices carried out with TiOx electron transport layer, Chlorobenzene (CB) and 1,8 Diiodooctane (DIO) solvents. Optical and surface characterization analysis carried out by UV-visible and AFM techniques respectively. From the J-V characteristics, the device prepared with CB+DIO mixture solvents and TiOx layer exhibits the best power conversion efficiency of 4.90%. It shows the device efficiency is one order of magnitude higher compared to that achieved with a TiOx electron transport layer and without DIO solvent. The obtained results shows that DIO cosolvent induced changes in active layer morphology down to nano scale range and the TiOx layer decrease the resistance between the active layer and electrode material.

Paper Details

Date Published: 13 September 2012
PDF: 8 pages
Proc. SPIE 8477, Organic Photovoltaics XIII, 84770L (13 September 2012); doi: 10.1117/12.928556
Show Author Affiliations
Shizuyasu Ochiai, Aichi Institute of Technology (Japan)
Palanisamy Kumar, Aichi Institute of Technology (Japan)
Kannappan Santhakumar, Aichi Institute of Technology (Japan)
Leona Saitoh, Aichi Institute of Technology (Japan)
Kenzo Kojima, Aichi Institute of Technology (Japan)
Paik-Kyun Shin, Inha Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8477:
Organic Photovoltaics XIII
Zakya H. Kafafi; Christoph J. Brabec; Paul A. Lane, Editor(s)

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