Manipulating the hysteresis in poly(vinyl alcohol)-dielectric organic field-effect transistors toward memory elements

Tzung Da Tsai, Jer Wei Chang, Ten Chin Wen, Tzung Fang Guo

研究成果: Article同行評審

115 引文 斯高帕斯(Scopus)

摘要

The origins of hysteresis in organic field-effect transistors (OFETs) and its applications in organic memory devices is investigated. It is found that the orientations of the hydroxyl groups in poly(vinyl alcohol) (PVA) gate dielectrics are correlated with the hysteresis of transfer characteristics in pentacene-based OFETs under the forward and backward scan. The applied gate bias partially aligns the orientations of the hydroxyl groups perpendicular to the substrate as characterized by reflective absorption Fourier transform infrared spectroscopy (RA-FTIR), in which the field-induced surface dipoles at the pentacene/PVA interface trap charges and cause the hysteresis. Treating PVA with an anhydrous solvent eliminates the residual moisture in the dielectrics layer, allowing for more effective control of the induced dipoles by the applied gate bias. OFETs of dehydrated-PVA dielectrics present a pronounced shift of the threshold voltage (ΔVTh) of 35.7 V in transfer characteristics, higher than that of 18.5 V for untreated devices and results in sufficient dynamic response for applications in memory elements. This work highlights the usage of non-ferroelectric gate dielectrics to fabricate OFET memory elements by manipulating the molecular orientations in the dielectrics layer. The use of non-ferroelectric gate dielectrics to fabricate organic field-effect transistor memory elements by manipulating the molecular dipoles in the dielectric layer is highlighted. The applied gate bias partially aligns the orientations of the hydroxyl groups perpendicular to the substrate at the pentacene/dielectrics interface, which trap charges and cause the hysteresis.

原文English
頁(從 - 到)4206-4214
頁數9
期刊Advanced Functional Materials
23
發行號34
DOIs
出版狀態Published - 2013 9月 14

All Science Journal Classification (ASJC) codes

  • 一般化學
  • 一般材料科學
  • 凝聚態物理學

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