Improvements in Photoconductive Characteristics of Organic Device Using Silole Derivative
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概要
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Poly[9,9-dioctylfluorenyl-2,7-diyl]-co-1,4-benzo-(2,1,3)-thiadiazole (F8BT) is one of the suitable materials for color-selective organic photoconductive devices owing to its high carrier mobility and absorption coefficient against only the blue light. We investigated a mixing method using a silole derivative, 1,1-dimethyl-2,3,4,5-tetraphenylsilole (DMTPS), in F8BT to improve the ratio between photocurrent and dark current (ON/OFF ratio), which is an important parameter for practical organic photoconductive devices. These organic materials can be coated by a solution process, which leads us to realize a low fabrication cost and a large device area in the future. By adding DMTPS into F8BT, the maximum improvement in ON/OFF ratio of 5 times was achieved compared with the reference device with F8BT only; however, the external quantum efficiency was independent of the concentration of DMTPS less than 50 wt %. In addition, the wavelength selectivity of DMTPS:F8BT in the visible wavelength region was almost the same as that of F8BT only. This result indicates that the DMTPS:F8BT layer can absorb only the blue light, indicating the possibility of a color separation without a prism for high-resolution cameras by combining the green- and red-sensitive devices.
- 2010-01-25
著者
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Terunuma Daiyo
Graduate School Of Science And Engineering Saitama University
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Fukuda Takeshi
Graduate School Of Science And Engineering Waseda University
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Fukuda Takeshi
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Ohkubo, Sakura, Saitama 338-8570, Japan
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Kobayashi Ryohei
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Ohkubo, Sakura, Saitama 338-8570, Japan
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Kamata Norihiko
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Ohkubo, Sakura, Saitama 338-8570, Japan
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照沼 大陽
NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya, Tokyo 157-8510, Japan
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Seo Hokuto
NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya, Tokyo 157-8510, Japan
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Hatano Ken
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Ohkubo, Sakura, Saitama 338-8570, Japan
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Aihara Satoshi
NHK Science and Technical Research Laboratories, 1-10-11 Kinuta, Setagaya, Tokyo 157-8510, Japan
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Terunuma Daiyo
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Ohkubo, Sakura, Saitama 338-8570, Japan
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FUKUDA Takeshi
Graduate School of Engineering, Osaka University, Osaka 560-0043, Japan
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