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Volatile electrical switching in a functional polyimide containing electron-donor and -acceptor moieties
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10.1063/1.3077286
/content/aip/journal/jap/105/4/10.1063/1.3077286
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/4/10.1063/1.3077286
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Molecular structure of PYTPA-PI and schematic diagram of the memory device consisting of a thin film of PYTPA-PI sandwiched between an ITO bottom electrode and an Al top electrode.

Image of FIG. 2.
FIG. 2.

Synthesis routes for the monomers and PYTPA-PI.

Image of FIG. 3.
FIG. 3.

UV-visible absorption spectrum (solid curve) and fluorescence emission spectrum (dash curve) with excitation at 343 nm of PYTPA-PI in DMAc solution.

Image of FIG. 4.
FIG. 4.

Cyclic voltammogram measurement of PYTPA-PI on a platinum disk electrode in /acetonitrile solution, with Ag/AgCl as the reference electrode and a platinum wire as the counterelectrode.

Image of FIG. 5.
FIG. 5.

(a) characteristics of an ITO/PYTPA-PI/Al device under ambient conditions. The sequence and direction of each sweep are indicated by the respective number and arrow. The seventh and eighth sweeps were conducted sequentially about 1 min after the power had been turned off. The 9th–12th sweeps were conducted after the probe contact had been lifted and reapplied to the device, and the 12th sweep was conducted about 2 min after the power had been turned off. The ON state was sustained by a refreshing voltage pulse of 2 V, with a pulse duration of 1 ms in every 5 s, as shown by the rf trace. (b) characteristics of an ITO/PYTPA-PI/Al device showing bidirectional electrical switching behaviors under ambient conditions. The sequence and direction of each sweep are indicated by the respective number and arrow. The fifth sweep was conducted about 1 min after the power had been turned off. (c) characteristics of an ITO/PYTPA-PI/Al device showing similar bidirectional electrical switching behaviors under an argon atmosphere. The sequence and direction of each sweep are indicated by the respective number and arrow. The fifth sweep was conducted about 2 min after the power had been turned off.

Image of FIG. 6.
FIG. 6.

(a) LUMO and HOMO energy levels of the PYTPA-PI BU and the functional moieties of PYTPA-PI along with the work functions of the ITO and Al electrodes. The energy levels of the copolymer determined from CV and UV-visible absorption measurements are denoted with an asterisk. (b) Calculated molecular orbitals, the corresponding energy levels of the BU, and the plausible electronic transitions under an electric field.

Image of FIG. 7.
FIG. 7.

Experimental and fitted curves of the ITO/PTPA-PI/Al device: (a) OFF state current fitted with the Schottky emission model and (b) ON state current fitted with the Ohmic model.

Image of FIG. 8.
FIG. 8.

Effect of operation time on the ON and OFF states of the ITO/PYTPA-PI/Al device under a constant stress of 2 V and the ON/OFF current ratio as a function of the applied bias for the same sweep.

Image of FIG. 9.
FIG. 9.

Effect of read pulses of 2 V on the ON and OFF states of the ITO/PYTPA-PI/Al device. The inset shows the pulses used for the measurement.

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/content/aip/journal/jap/105/4/10.1063/1.3077286
2009-02-17
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Volatile electrical switching in a functional polyimide containing electron-donor and -acceptor moieties
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/4/10.1063/1.3077286
10.1063/1.3077286
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