Enhanced photoconductivity and trapping rate through control of bulk state in organic triphenylamine-based photorefractive materials |
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| Authors: | Sho Tsujimura Takashi Fujihara Takafumi Sassa Kenji Kinashi Wataru Sakai Koji Ishibashi Naoto Tsutsumi |
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| Affiliation: | 1. Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, 1 Hashigami-cho, Matsugasaki, Sakyo, Kyoto 606-8585, Japan;2. Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;3. RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;4. Innovative Organic Device Laboratory, Institute of Systems, Information Technologies and Nanotechnologies (ISIT), 4-1 Kyudai Shinmachi, Fukuoka 819-0388, Japan |
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| Abstract: | In organic optical semiconductors, it is rather challenging to achieve precise control of photoconductivity and charge trapping, which determines the device performance. This paper reports on enhanced photorefractive response rate through control of the photoconductivity and trapping rate in organic triphenylamine-based photorefractive materials by means of bulk state tuning. The bulk state in organic triphenylamine-based photorefractive composites was controlled through a rapid cooling process from various melting temperatures during sample fabrication. The photoconductivity and trapping rate were determined from photocurrent measurements. Fabrication at lower melting temperatures enhanced the trapping rate for deep traps, whereas it reduced the trapping rate for shallow traps. As a result, a faster photorefractive response was obtained. |
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| Keywords: | Charge transport Trapping rate Photoconductivity Organic photorefractive materials Triphenylamine derivatives |
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