|Title:||Volatility Transition from Short-Term to Long-Term Photonic Transistor Memory by Using Smectic Liquid Crystalline Molecules as a Floating Gate||Authors:||Li G.-S
|Keywords:||liquid crystals;photomemory;rod-like molecules;smectic mesophase;transistor-type memory;Organic field effect transistors;Smectic liquid crystals;Thiophene;Field-effect transistor;Floating gates;Liquid-crystals;Photomemory;Photonic fields;Rod-like molecule;Smectic liquid crystalline;Smectic mesophases;Transistor types;Transistor-type memory;Molecules||Issue Date:||2021||Source:||Advanced Electronic Materials||Abstract:||
Rod-like molecules with liquid crystalline phase transitions show highly ordered stacking and orientation, which is promising as the floating gate electret in high-performance photonic field-effect transistor (FET) memory. In this work, a series of rod-like molecules, alkyl-dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (Cn-DNTT), are investigated with a smectic liquid crystalline phase transition. The photonic FET memory featuring these rod-like molecules is correlated with their morphology and crystallographic properties. A volatility transition from short?term to long?term memory behavior is found by utilizing the smectic liquid crystalline phase transitions (SmX, X = H, K, E) to orient the stacking in the floating gate. Accordingly, the annealed 2,9-didecyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (C10-DNTT) polycrystalline film with the optimized alkyl chain length achieved preferential end-on orientation associated with the herringbone-type stacking to store charges during photowriting, along with effective charge tunneling for the trapped charges during electrical erasing. Therefore, the resultant photonic FET memory provided a superior ON/OFF current ratio of up to 105 with retention of 104 after 104 s. The results demonstrate that rod-like molecules with smectic liquid crystalline phase and highly ordered orientation have great potentials for developing high-performance photonic FET memory. ? 2021 Wiley-VCH GmbH
|Appears in Collections:||化學工程學系|
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