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Organic field-effect transistors have been envisioned for advanced photodetectors because the organic semiconductors provide unique absorption characteristics, low-cost fabrication, or compatibility with flexible substrates. However, the response time of organic phototransistors still does not reach the required application level. Here, we report the photoresponse of copper phthalocyanine phototransistor in a steady state and under pulsed illumination. The detailed analysis based on the random walk among a field of traps was used to evaluate the dimensionality of electron transport in a device.

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Metal-oxide semiconductors have drawn great attention in recent years for the possibility of low-cost applications. Especially solution-processed copper-oxide transistors have been envisioned; however, they struggle because of low effective mobility and high-cost metals used for injection electrodes. Here we report the application of gold and aluminium for source/drain electrodes of the device using cupric oxide as an active layer. Furthermore, the detailed analysis of the contact resistance illustrates a lower injection barrier for aluminium electrodes, making them a suitable replacement for high-cost gold electrodes.