Spray deposited PTB7:PC71BM organic polymer solar cells for efficient power generation

Shizuyasu Ochiai; Palanisamy Kumar; Kannappan Santhakumar; Leona Saitoh; Kenzo Kojima; Paik-Kyun Shin

doi:10.1117/12.928556

13 September 2012 Spray deposited PTB7:PC₇₁BM organic polymer solar cells for efficient power generation

Shizuyasu Ochiai, Palanisamy Kumar, Kannappan Santhakumar, Leona Saitoh, Kenzo Kojima, Paik-Kyun Shin

Proceedings Volume 8477, Organic Photovoltaics XIII; 84770L (2012) https://doi.org/10.1117/12.928556
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

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 TiO_x 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 TiO_x 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 TiO_x layer decrease the resistance between the active layer and electrode material.

Citation Download Citation

Shizuyasu Ochiai, Palanisamy Kumar, Kannappan Santhakumar, Leona Saitoh, Kenzo Kojima, and Paik-Kyun Shin "Spray deposited PTB7:PC₇₁BM organic polymer solar cells for efficient power generation", Proc. SPIE 8477, Organic Photovoltaics XIII, 84770L (13 September 2012); https://doi.org/10.1117/12.928556

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