JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS
We demonstrate carrier injection and transport of steady-state high current density into organic thin films. The maximum current density reaches J=1053A/cm(2), the highest ever reported. We employ a 25 nm-thick Copper phthalocyanine (CuPc) thin film sandwiched between an indium-tin-oxide anode and a magnesium-silver alloy cathode with an active electrode dot-size (S) of S=2.0 x 10(-5)cm(2) (radius: r=25mum). We observed that the maximum current density depends on the organic materials used, and the device size and thickness. Decreasing the organic layer thickness significantly changes the current density-voltage (J-V) characteristics, demonstrating that the rate-limiting step of the J-V characteristics changes from the carrier transport process to the carrier injection process. Our achievement of high current density exceeding 1000A/cm(2) in organic thin films is a first step towards the development of organic laser diodes that need extremely high excitation intensity.
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