Jpn. J. Appl. Phys. 47 (2008) pp. 1094-1097  |Previous Article| |Next Article|  |Table of Contents|
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Efficiency Enhancement in Organic Photovoltaic Cell with Interpenetrating Conducting Polymer/C60 Heterojunction Structure by Substrate-Heating Treatment

Varutt Kittichungchit, Takeshi Shibata, Hideki Noda, Hiroshi Tanaka, Akihiko Fujii, Noriaki Oyabu, Masayuki Abe, Seizo Morita, and Masanori Ozaki

Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan

(Received October 9, 2007; revised October 26, 2007; accepted November 1, 2007; published online February 15, 2008)

The effect of heat treatment during evaporation of C60 on the characteristics of a photovoltaic cell with a structure of indium–tin-oxide (ITO)/C60/poly(3-hexylthiophene) (PAT6)/Au was studied. The C60 films were fabricated on the substrates at different temperatures and the C60/PAT6 heterojunction of this photovoltaic cell was fabricated by spin-coating the solution of PAT6 onto the C60 thin film formed on ITO. Heating the substrate caused a marked increase in the short-circuit current and in the external quantum efficiency (EQE); these were discussed by taking the morphology and carrier mobility of the C60 thin film fabricated by this method into consideration.

DOI: 10.1143/JJAP.47.1094
KEYWORDS:conducting polymer, fullerene, photovoltaic cell, interpenetrating interface

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