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Molecular Conformation-dependent Memory Effects in Non-conjugated Polymers with Pendant Carbazole Moieties

  • Siew Lay Lim (a1), Qidan Ling (a2), Eric Yeow Hwee Teo (a3), Chun Xiang Zhu (a4), Daniel Siu Hung Chan (a5), En Tang Kang (a6) and Koon Gee Neoh (a7)...

Abstract

Single-layer devices of the structure indium-tin-oxide/polymer/aluminum were fabricated from two non-conjugated polymers with pendant carbazole groups in different spacer units. The device based on poly(2-(N-carbazolyl)ethyl methacrylate) (PMCz) exhibited non-volatile write-once-read-many-times (WORM) memory behavior with an ON/OFF current ratio up to 106, while the device based on poly(9-(2-((4-vinylbenzyl)oxy)ethyl)-9H-carbazole) (PVBCz) exhibited volatile memory behavior with an ON/OFF current ratio of approximately 103. In the absence of a spacer unit between the pendant carbazole group and the main chain, regioregular poly(N-vinylcarbazole) (PVK) exhibited only one conductivity state (ON state). The switching and memory effects observed were attributed to conformation changes of the pendant carbazole groups.

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