5 years ago

Ionic Species-Modulated Interfacial Polarization and Frequency Selectivity in Polymer Electrolyte/Semiconductor Heterojunctions

Ionic Species-Modulated Interfacial Polarization and Frequency Selectivity in Polymer Electrolyte/Semiconductor Heterojunctions
Jialu Liu, Yuandong Hu, Jun Yin, Fei Zeng, Qin Wan
Microstructures and ionic species in Ca(CF3SO3)2 doped poly(ethylene oxide)(PEO-CaTf2) are modulated by varying the ethylene oxide (EO)/Ca2+ ratio. Increasing the salt concentrations, that is, reducing EO/Ca2+, can enhance the ratios of ion-pairs and aggregates but reduce the ratio of free ions, accompanied by reduced grain size and narrowed ion passages. Such microscopic variations influence the transportation properties of PEO-CaTf2/poly(3-hexylthiophene-2,5-diyl) (P3HT) heterojunctions in two aspects. First, the negative differential resistance (NDR) is under the bias loaded from PEO-CaTf2 to P3HT and shifts left to the region of low voltage with decreased EO/Ca2+ because the interfacial polarization was weakened due to the reduced mobility of anions, confirmed by the fitted results of the facilitate time constant (τF). Second, pulse responses were tested and the short-term synaptic plasticity was examined for the system. Evident frequency selectivity occurs for the heterojunctions with larger EO/Ca2+, but monotonous weight potentiation was only observed for the sample with an EO/Ca2+ of 8:1. This is due to the reason that the reduced polarization does not induce effective doping. Our results demonstrate that the types of ionic species are able to modulate signal selectivity, which might be a part of the secrets of information handling the biological body.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b05160

DOI: 10.1021/acs.jpcc.7b05160

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