Development of photo-switching transistors using functional organic molecules

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The objective of our study is to control the charge-transfer at organic hetero-interface by photo-irradiation, leading to development of photo-switching organic transistor. Firstly, we successfully improved electrical properties of quaterrylene (QT) thin film transistors by interface-engineering. As a result, even 2ML-thick QT thin films worked as p-typed transistors. Then, we formed organic hetero-layer transistors, where charge-transfer complex molecules with high electron acceptability were deposited on the top of QT transistors. Threshold voltage in the hetero-layer transistors was drastically changed by charge-transfer complex molecules, demonstrating that transistor properties can be controlled through organic hetero-interface.