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Jpn. J. Appl. Phys. 51 (2012) 04DK09 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Fundamental Study on Organic Solar Cells Based on Soluble Zinc Phthalocyanine

Ichiko Yamada1, Masashi Umeda, Yasuhiko Hayashi, Tetsuo Soga, and Norio Shibata

Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
1Department of Electrical and Electronic Engineering, Suzuka National College of Technology, Suzuka, Mie 510-0294, Japan

(Received September 28, 2011; accepted December 20, 2011; published online April 20, 2012)

We investigated the potential of trifluoroethoxy-coated phthalocyanine [(4TFEO)4-ZnPc] as an organic thin-film solar cell material. (4TFEO)4-ZnPc dissolves well in several organic solvents, thus a fluorinated phthalocyanine (Pc) thin film can be fabricated by a wet process. Additionally, (4TFEO)4-ZnPc has lowest unoccupied molecular orbital (LUMO) energy level close to that of a fullerene derivative owing to the electron-withdrawing effect of fluorine substituents. We fabricated two types of fluorinated Pc solar cells by spin casting “(4TFEO)4-ZnPc single-layer solar cells” and “two-layer heterojunction solar cells” consisting of a (4TFEO)4-ZnPc layer and a poly(3-hexylthiophene) (P3HT) layer. P3HT is a common donor solar cell material. On the other hand, we used (4TFEO)4-ZnPc as an acceptor material. For the single-layer solar cells, the (4TFEO)4-ZnPc film acts as the photoactive layer of the solar cells, and P3HT/(4TFEO)4-ZnPc solar cell properties were improved as compared with that of P3HT or (4TFEO)4-ZnPc single-layer solar cells. Additionally, the photovoltaic properties of these solar cells were significantly improved by annealing treatment.

URL: http://jjap.jsap.jp/link?JJAP/51/04DK09/
DOI: 10.1143/JJAP.51.04DK09


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