Quantification of temperature rise in unipolar organic conductors during short voltage-pulse excitation using electrical testing methods |
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| Affiliation: | 1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;2. JST, ERATO, Adachi Molecular Exciton Engineering Project, c/o OPERA, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;3. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;1. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, PR China;2. State Key Lab of Transducer Technology, Chinese Academy of Sciences, PR China;3. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China;1. Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, P.O.B. 143, 149 Yanchang Rd., Shanghai 200072, PR China;2. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;2. Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;3. Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan;4. Institute for Liberal Arts and Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan;1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;2. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States |
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| Abstract: | To quantify the rise in device temperature caused by Joule heating during short voltage-pulse excitation at high current densities (>10 A/cm2), the device temperatures of unipolar organic conductors were measured using electrical testing methods. For a maximum voltage amplitude of 59 V at a current density of ∼300 A/cm2, temperature rose over 145 °C within a pulse duration of 5 μs in an N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (α-NPD)-based single-carrier organic conductor. This result is in reasonable agreement with numerically calculated values. These findings indicate that suppressing the effects of Joule heating by carefully adjusting pulse width, substrate and organic materials, and device configuration is important to achieve further carrier injection in the ultra-high current density region (>1 kA/cm2). |
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| Keywords: | Organic light-emitting diodes Joule-heating Pulse Operation |
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