Diketopyrrolopyrroles as Acceptor Materials in Organic Photovoltaics

✍ Scribed by Bram P. Karsten; Johan C. Bijleveld; René A. J. Janssen

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 203 KB
• Volume: 31
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.201000133

✦ Synopsis

Abstract

In the search of new electron acceptor, n‐type materials for organic solar cells that combine a strong absorption over a broad range with good electrical characteristics, the use of diketopyrrolopyrrole (DPP) derivatives with low reduction potentials is explored. A series of small molecule DPP derivatives is presented and the compounds are tested as electron acceptors in combination with poly(3‐hexylthiophene) (P3HT) as the donor material. Working photovoltaic devices are obtained that show a photoresponse in the wavelength region where the DPP molecules absorb. The best device shows a power conversion efficiency of 0.31% in simulated solar light, with a photon‐to‐electron conversion efficiency of ∼10% up to 700 nm. The efficiency seems to be limited by the coarse morphology of the blend.

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