Electroactive Crystalline Polymers for Semiconductor Device Solutions
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Spontaneous polarization from aligned polymer chains of large dipole moments offers numerous opportunities for controlling of electrical and ionic properties of diverse materials, boosting-up of device performances and realizing novel device architectures. Ferroelectric polymers, such as fluorinated polymers or polyamides, are representative electroactive polymers of which the polarizations can be modulated by electrical stimuli in non-volatile manner. Here we present that the ferroelectric fluorinated polymers can solve an issue of mobile ions in diverse semiconductors such as halide perovskites. The spontaneous polarization enables the fixation of the mobile ions by simple electrical stimuli, leading to operation of perovskite transistors at room-temperature. We further introduce a novel processing route to use polyamides, or nylons, as ferroelectric thin films to obtain long-term stable polarizations in place of conventional fluorinated polymers.