Photoresponse of composites of zinc oxide and poly(3-hexythiophene) under selective UV and white-light illumination |
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| Affiliation: | 1. NECTEC, National Science and Technology Development Agency (NSTDA), 112 Thailand Science Park, Thanon Phahonyothin, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani, 12120, Thailand;2. NANOTEC, National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Thanon Phahonyothin, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani, 12120, Thailand;3. College of Nanotechnology, King Mongkut''s Institute of Technology Ladkrabang, Thanon Chalongkrung, Ladkrabang, Bangkok, 10520, Thailand;1. Low Dimensional Materials Research Centre (LDMRC), Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Electrical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar;1. School of Physical Science and Technology, Southwest University, Chongqing 400715, People''s Republic of China;2. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, People''s Republic of China;1. Physical Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India;2. Laser and Plasma Technology Division, Bhabha Atomic Research Center, Trombay, Mumbai, India;1. School of Electrical and Photoelectronic Engineering, Changzhou Institute of Technology, Changzhou, Jiangsu 213002, China;2. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, China;3. ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia;1. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, South Korea;2. Department of Organic Material Science and Engineering, Pusan National University, Busan, 46241, South Korea;1. Organic Nanoelectronics Laboratory, Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea;2. Department of Physics, Division of Mathematical, Physical and Life Sciences, University of Oxford, Oxford OX1 3PD, United Kingdom;3. Department of Engineering Science, Division of Mathematical, Physical and Life Sciences, University of Oxford, Oxford OX1 3PD, United Kingdom;4. Priority Research Center, Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Republic of Korea |
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| Abstract: | We investigate charge transport in UV sensing devices based on organic-inorganic semiconductor composites with the metal-semiconductor-metal (MSM) structure. Composite materials of zinc oxide (ZnO) nanoparticles and poly(3-hexylthiophene) (P3HT) were prepared by drop-casting their colloidal mixture in chloroform onto low-cost interdigitated copper electrodes. The current-voltage characteristics of the devices were investigated under both dark and illuminated conditions in the UV–visible range. The highest photoresponse was observed for an optimal P3HT:ZnO ratio of 1:8 w/w in the wavelength range between 310 and 380 nm. The dynamic response was investigated by pulsing a 365 nm UV light with a long period to reveal the response time of 4 s and the recovery time of less than 1 s. The photoresponse of the materials was also investigated for a shorter period of UV pulsing, using a rotating chopper. The response time and recovery time for the short UV pulse were found to be approximately 20 m and 25 m, respectively. The dual response times should stem from the presence of two types of semiconductor materials, namely ZnO with a high electron mobility and P3HT with a moderate hole mobility. To probe the charge generation and transport mechanisms, we further investigate the photoresponse using UV pulsing under background white light of different intensities, and vice versa. The background white light was found to deteriorate the UV photoresponse of the materials. On the other hand, the background UV illumination produced an anomalous photoresponse pattern with the white light pulsing. Understanding the charge transport mechanisms for composite materials is highly important for future applications in low-cost UV sensors and tunable optoelectronic devices. |
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| Keywords: | Organic-inorganic composites Polythiophene Zinc oxide UV sensors Selective illumination |
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