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To achieve long\u2010term retention time, correlating the synaptic responses with the microstructures of polymer semiconductor is an imperative step. It is shown that synaptic plasticity in ion\u2010gel\u2010gated organic synaptic transistors (IGOSTs) can be modulated by controlling the microstructure of organic semiconductors and that long\u2010term memory retention can be significantly prolonged by increasing their crystallinity. The crystallinity of poly(3\u2010hexylthiophene\u20102,5\u2010diyl) (P3HT) films that are spun\u2010cast on bare and self\u2010assembled monolayer is systematically controlled, before and after thermal treatments. Long\u2010term retention tends to extend, as the crystallinity increases. To evaluate synaptic current decay behaviors, it is suggested that the relaxation is a result of de\u2010doping of the polymer semiconductor over time. 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