| 摘要: | 摘要： We report the synthesis and resistive memory device characteristics of new donor-acceptor (D-A) conjugated poly(arylene vinylene) polymers, PVC-PI , PVT-PI , and PVTPA-PI , consisting of carbazole ( C ), thiophene ( T ), and triphenylamine ( TPA ) with pendent phenanthro[9,10- d ]imidazole ( PI ). PVC-PI , PVT-PI , and PVTPA-PI synthesized by Stille coupling reaction have the optical band gaps of 2.86, 1.68, and 2.58 eV, respectively. These polymers possess similar HOMO energy levels (−5.08 to −5.18 eV), but different LUMO energy levels (−2.24, −3.40, and −2.60 eV for PVC-PI , PVT-PI , and PVTPA-PI , respectively). The PVC-PI flexible device with the sandwich configuration of PEN/Al/polymer/Al reveals the volatile static random access memory (SRAM) characteristic while the PVTPA-PI device exhibits the nonvolatile write-once-read-many-times (WORM) switching behavior. The above two devices could operate at low voltages (less than 2.5 V) with high ON/OFF current ratios (over 10 4 ) and exhibit excellent durability upon repeated bending tests. However, the PVT-PI device only shows a diode-like electrical behavior. The polymer conformation affects the strength of D-A electrical polarization and charge trapping ability, leading to the variation of the volatility of the memory devices. The present study demonstrates that the prepared vinylene-based donor-acceptor conjugated polymers have excellent memory characteristics with reproducibility and reliability for advanced flexible organic electronics. Donor-acceptor conjugated polymers of arylene (carbazole, thiophene and triphenylamine) vinylene with pendent phenanthro[9,10- d ]imidazole are developed for electrical memory devices with volatile SRAM, diode-like, and nonvolatile WORM characteristics.
出版日期： 2013-09-17
資源來源： Royal Society of Chemistry
識別號： ISSN: 1759-9954
識別號： EISSN: 1759-9962
識別號： DOI: 10.1039/c3py00107e |
