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Synthesis of Alternating Copolysiloxane with Terthiophene and Perylenediimide Derivative Pendants for Involatile WORM Memory Device
Author(s) -
Wen Guanyin,
Ren Zhongjie,
Sun Dianming,
Zhang Tingjie,
Liu Lili,
Yan Shouke
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201304004
Subject(s) - terthiophene , materials science , homo/lumo , acceptor , polymer , photochemistry , fluorescence , threshold voltage , voltage , molecule , transistor , organic chemistry , optics , chemistry , physics , quantum mechanics , composite material , condensed matter physics
Alternating copolysiloxane with both electron donor terthiophene and electron acceptor perylenediimide derivative pendants (PTSi‐alt‐PDISi) is synthesized successfully. The polymer exhibits high decomposition and glass transition temperatures, good film‐forming ability, and high morphological stability. The estimated HOMO and LUMO energy levels of PTSi‐alt‐PDISi are –5.77 and –3.90 eV, respectively. The fabricated memory device with the configuration of ITO/PTSi‐alt‐PDISi/Au(Al) shows nonvolatile write‐once‐read‐many‐times (WORM) memory characteristics. Its turn‐on threshold voltage is 1.7 V, while its ON/OFF current density ratio is around 10 4 in ambient atmosphere. The well‐defined memory property of PTSi‐alt‐PDISi is attributed to the transition of the pendant terthiophene and perylenediimide groups from the disoriented state to the ordered face‐to‐face conformation at the threshold voltage and the charge transfer interaction between pendent terthiophene donor and perylenediimide acceptor moieties, which are confirmed by XRD patterns and fluorescence emission measurement. This suggests that the new donor–acceptor polysiloxanes have potential applications in the field of memory devices.