Small-Molecule-Based Organic Photovoltaic Devices Covering Visible and Near-Infrared Absorption through Phase Transition of Titanylphthalocyanine Induced by Solvent Exposure

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概要

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• Small-molecule p--n heterojunction organic photovoltaic (OPV) devices with a two-component donor layer composed of tetrabenzoporphyrin (BP) and titanyl phthalocyanine (TiOPc) can utilize near-infrared (NIR) light up to 950 nm and shows a 2.4% power conversion efficiency (PCE) (J_{\text{sc}} = 7.7 mA/cm2; open circuit voltage, V_{\text{oc}} = 0.61 V; and fill factor, \mathrm{FF}= 0.50) under AM1.5G illumination at an intensity of 100 mW/cm2. This value is higher than the 2.0% value obtained by an archetypal device composed of a single-component BP layer. The device performance was improved by the exposure of the TiOPc layer to toluene, which induced a rapid change in the morphology of the TiOPc layer from what is called Phase I to Phase II. The acceptor layer comprising 1,4-bis(dimethyl-phenylsilylmethyl)[60]fullerene (SIMEF) showed higher V_{\text{oc}} and PCE than that comprising popular PCBM, because the lowest unoccupied molecular orbital (LUMO) level of SIMEF is higher than that of PCBM.

• 2011-12-25

著者

• Nakamura Eiichi

  Department Of Biochemistry And Molecular Biology Graduate School Of Medicine The University Of Tokyo

• Matsuo Yutaka

  Department Of Chemistry Graduate School Of Engineering Science Osaka University

• Sato Yoshiharu

  Mitsubishi Chemical Group Science and Technology Research Center, Inc., Yokohama 227-8502, Japan

• Obata Naoki

  Department of Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan

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