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Injection and transport of extremely high current densities in organic thin-film devices

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Abstract

High current density injection and transport in organic semiconductor devices is a key to realize electrically pumped organic laser diodes. We recently achieved high current density injection and transport into organic thin films by decreasing active device areas and the use of high thermal conductive substrates to remove joule heat during the device operation.1) In this study, using electron-beam lithography and vacuum thermal evaporation techniques, we fabricated a copper phthalocyanine (CuPc) thin-film device having the smallest active device area of S=0.04μm2 on a high thermal conductive silicon substrate, and demonstrate an extremely high breakdown current density of JMAX =6.35MA/cm2. This high current density injection and transport reveal that current density-voltage characteristics of the CuPc device can be categorized into the four charge-carrier transport processes, i.e., ohm current, shallow-trap space-charge-limited current (SCLC), trap-free SCLC, and two-carrier injection current processes. We discuss on the detailed injection and transport mechanism, and the prospect of organic laser diodes.

© 2006 Optical Society of America

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