Performance improvement of ZnO/P3HT hybrid UV photo-detector by interfacial Au nanolayer |
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| Institution: | 1. Molecular and Nanoelectronics Research Group (MNRG), Department of Electrical Engineering, IIT Indore, India;2. Mechatronics and Instrumentation Lab, Department of Mechanical Engineering, IIT Indore, India;3. Department of Material Science Engineering, IIT Indore, India;1. School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Republic of Korea;2. Department of Sensor and Display Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Republic of Korea;3. Center for Functional Devices Fusion Platform, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Republic of Korea;4. Division of Computer and Electronic Engineering, Pusan University of Foreign Studies, 65 Namsan-dong, Geumjeong-gu, 608-738 Busan, Republic of Korea;5. Department of Electronic Engineering, Kyungil University, 33 Buho-ri, Hayang-eup, Gyeongsan-si 712-701, Republic of Korea;1. Department of Physics and Astronomy, University of Missouri, Columbia, MO, 65211, USA;2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India;1. Department of Instrumentation Science, Jadavpur University, Kolkata, 700032, India;2. Department of Industrial Chemistry and Applied Chemistry, Ramakrishna Mission Vidyamandira, Belur Math, 711202, India;1. Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan;2. Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan;3. Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, 820-8502, Japan |
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| Abstract: | In this study, a hybrid ultraviolet (UV) photo detector comprising of hydrothermally grown highly oriented Zinc Oxide nanorod arrays (ZnO NRAs) and Poly(3-hexylthiophene-2,5-diyl) (P3HT) as an active layer was fabricated and characterized. These hybrid photo detectors demonstrated a high rectification ratio (∼117) and responsivity of 10.7 A/W at −2 V under incident light of wavelength 325 nm. Further to investigate the effect of surface plasmon property of metal nanoparticles on the performance of hybrid UV photo detectors, ZnO NRAs were capped with dc sputtered gold (Au) metal nanolayer (∼5 nm) at the ZnO-P3HT interface, prior to coating P3HT layer on top of it. It was found out that upon Au coating the absorption of the ZnO was enhanced partly in the ultraviolet and visible region. In consequence the rectification ratio and responsivity of the hybrid photo detector was enhanced drastically from 117 to 1167 and 10.7 to 17.7 A/W respectively. Interestingly the reduction in dark current was observed on Au coating and it was revealed that Au nanoparticles play a key role in enhancing the performance of the hybrid photo detectors. |
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| Keywords: | Ultraviolet photo detector Organic–inorganic Polymer Responsivity |
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