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Improve on/off ratio of organic heterojunction transistors by adopting single-sandwich configuration
Authors:Jianwu Shi   Hua Wang   Haibo Wang   Hongkun Tian   Yanhou Geng  Donghang Yan  
Affiliation:a Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China;b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Abstract:Organic heterojunction transistors (OHJTs) based on 5,5′″-bis(naphtha-2-yl)-2,2′:5″,2′″-quaterthiophene (NaT4)/copper-hexadecafluoro-phthalocyanine (F16CuPc) heterojunction were fabricated in single-sandwich and sandwich configurations, respectively. All the devices operated in depletion-accumulation (normally-on) mode. High field-effect mobility of 0.35 cm2/Vs was obtained for all devices, which was higher than that, 0.20 cm2/Vs of the devices with NaT4 as active layer. The on/off ratio of 1 × 105 was obtained for OHJTs with single-sandwich configuration, which is three orders of magnitude higher than that of OHJTs with sandwich configuration. Compared with OHJTs with sandwich configuration, the higher on/off ratio was mainly determined by the lower off state current in OHJTs with single-sandwich configuration. In OHJTs with single-sandwich configuration, the well-type shield effect of the source and drain electrodes caused a very narrow empty region in F16CuPc film, which is responsible for the lower off state current.
Keywords:Organic heterojunction transistors   Depletion–  accumulation mode   Mobility   On/off ratio
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