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Synergy Effect of Porphyrin Units and Alkynyl π Bridges Tunes the Memory Behavior and Threshold Voltage of Hyperbranched Polyimides
- Source :
- The Journal of Physical Chemistry - Part C; February 2020, Vol. 124 Issue: 5 p2872-2878, 7p
- Publication Year :
- 2020
-
Abstract
- Porphyrin units are a kind of ideal electron donor units, which have large π conjugation and well-defined planar and electron-rich structures. The inserted alkynyl π bridges between porphyrin units and anhydride moieties can effectively enlarge the π-electron delocalization and molecular dimension effect and thus enhance the electron-donating ability and reduce the dipole moment in the porphyrin-based hyperbranched polyimides (HBPIs). The synergy effect of porphyrin units and alkynyl π bridges can facilitate the charge-transfer formation and dissociation, realize the transformation of memory type, and shorten the retention time of HBPI-TAPEPP-6FDA-based memory devices. The HBPI-TAPEPP-6FDA-based memory devices manifest lower threshold voltages of −2.32 and 2.42 V, a higher ON/OFF current ratio up to 107, and a shorter retention time of ∼20 s.
Details
- Language :
- English
- ISSN :
- 19327447 and 19327455
- Volume :
- 124
- Issue :
- 5
- Database :
- Supplemental Index
- Journal :
- The Journal of Physical Chemistry - Part C
- Publication Type :
- Periodical
- Accession number :
- ejs52084007
- Full Text :
- https://doi.org/10.1021/acs.jpcc.9b11370