Joule heat-induced breakdown of organic thin-film devices under pulse operation

Kou Yoshida, Toshinori Matsushima, Yu Shiihara, Hiroyuki Kuwae, Jun Mizuno, Chihaya Adachi*


研究成果: Article査読

11 被引用数 (Scopus)


We investigated the influence of the substrate's thermal conductivities (k) and the widths of the electrical pulses (τpulse) on the maximum current densities (Jmax) in organic thin-film devices. We also estimated the temperature rise (ΔT) inside devices under the pulse operation using numerical calculations to interpret the observed differences in Jmax. For a long τpulse of 5 μs, Jmax is higher for devices with high-k sapphire substrates (around 1.2 kA/cm2) than devices with low-k plastic substrates (around 0.4 kA/cm2). This is because high-k sapphire substrates can work as heat sinks to relax ΔT for such a long τpulse. Operation of devices with high-k sapphire substrates for a short τpulse of 70 ns resulted in further relaxation of ΔT, leading to an increase of Jmax to around 5 kA/cm2. Interestingly, for such a short τpulse, devices with high-k sapphire and low-k plastic substrates showed similar Jmax and ΔT values, the reason for which may be that it is difficult for the generated Joule heat to travel to the substrate across a low-k organic layer within this short time.

ジャーナルJournal of Applied Physics
出版ステータスPublished - 2017 5月 21

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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