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Inserting Thienyl Linkers into Conjugated Molecules for Efficient Multilevel Electronic Memory: A New Understanding of Charge‐Trapping in Organic Materials
Author(s) -
Li Yang,
Li Hua,
He Jinghui,
Xu Qingfeng,
Li Najun,
Chen Dongyun,
Lu Jianmei
Publication year - 2016
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201501441
Subject(s) - stacking , materials science , planarity testing , ternary operation , trapping , optoelectronics , conjugated system , molecule , polyetherimide , nanotechnology , computer science , polymer , chemistry , crystallography , organic chemistry , ecology , composite material , biology , programming language
The practical application of organic memory devices requires low power consumption and reliable device quality. Herein, we report that inserting thienyl units into D–π–A molecules can improve these parameters by tuning the texture of the film. Theoretical calculations revealed that introducing thienyl π bridges increased the planarity of the molecular backbone and extended the D–A conjugation. Thus, molecules with more thienyl spacers showed improved stacking and orientation in the film state relative to the substrates. The corresponding sandwiched memory devices showed enhanced ternary memory behavior, with lower threshold voltages and better repeatability. The conductive switching and variation in the performance of the memory devices were interpreted by using an extended‐charge‐trapping mechanism. Our study suggests that judicious molecular engineering can facilitate control of the orientation of the crystallite in the solid state to achieve superior multilevel memory performance.