Simple color sensing circuit based on organic field-effect transistors without color filters
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초록
내용
Organic semiconductor (OSC) research has been a fruitful endeavor for the last decades for a wide variety of applications due to the unique properties of these materials. The electron structure of OSCs is characterized by extended Π-conjugation, that is necessary for efficient charge transfer and also results in a HOMO-LUMO gap around 2-3 eV with narrow valence and conduction bands in the solid phase for most common OSCs. Therefore, OSCs generally have an absorption band of only a few hundred nanometers wide in the NIR, the visible or the low-energy UV region. In an organic field-effect transistor, the light absorbed by the semiconducting layer can be used to generate extra charge carriers to modulate the current, so a color-selective photodetector can be realized. In our research, we aim to fabricate a photodetector circuit using opposing polarity transistors based on two semiconductors with distinct absorbance properties to realize a color sensor in one complimentary inverter.