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Improving the ON/OFF Ratio and Reversibility of Recording by Rational Structural Arrangement of Donor – Acceptor Molecules
Author(s) -
Ma Ying,
Cao Xingbo,
Li Guo,
Wen Yongqiang,
Yang Ye,
Wang Jingxia,
Du Shixuan,
Yang Lianming,
Gao Hongjun,
Song Yanlin
Publication year - 2010
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.200901692
Subject(s) - materials science , acceptor , molecule , nanoelectronics , nanotechnology , molecular electronics , quantum tunnelling , scanning tunneling microscope , conductance , work function , nanoscopic scale , optoelectronics , chemistry , condensed matter physics , organic chemistry , physics , layer (electronics)
Organic molecules with donor – acceptor (D – A) structure are an important type of material for nanoelectronics and molecular electronics. The influence of the electron donor and acceptor units on the electrical function of materials is a worthy topic for the development of high‐performance data storage. In this work, the effect of different D – A structures (namely D – Π – A – Π – D and A – Π – D – Π – A) on the electronic switching properties of triphenylamine‐based molecules is investigated. Devices based on D – Π – A – Π – D molecules exhibit excellent write – read – erase characteristics with a high ON/OFF ratio of up to 10 6 , while that based on A – Π – D – Π – A molecules exhibit irreversible switching behavior with an ON/OFF ratio of about (3.2 × 10 1 )–(1 × 10 3 ). Moreover, long retention time of the high conductance state and low threshold voltage are observed for the D – A switching materials. Accordingly, stable and reliable nanoscale data storage is achieved on the thin films of the D – A molecules by scanning tunneling microscopy. The influence of the arrangement of the D and A within the molecular backbone disclosed in this study will be of significance for improving the electronic switching properties (ON/OFF current ratio and reversibility) of new molecular systems, so as to achieve more efficient data storage through appropriate design strategies.