Multi-valued logic inverter by resistance control of molecular switch
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Developing logic circuit systems that have high data throughput levels and mechanical flexibility is becoming more and more important with expanding market of AI and autonomous driving. In that respect, organic thin film transistors have weaknesses in high-temperature processes and fine patterning. As an alternative to solving this problem, a logic (MVL) system has been proposed.
Diarylethene, a molecular switch that can change its structure by light, was able to successfully decrease the current level of embedded organic polymer. In the electric field condition, charge carriers move from one electrode to the other. When UV light is irradiated to DAE, the HOMO level of DAE rises as the molecule becomes closed form. Then UV irradiation causes them to be trapped in the HOMO of DAE, which leads to the high resistance level. In the inverter operation mechanism, the output voltage depends on relative resistance of p-type semiconductor and n-type semiconductor. The resistance control through UV irradiation can give additional logic state.