Nonlinear transport in ionic liquid gated strontium titanate nanowires

Abstract

Measurements of the current-voltage (I–V) characteristics of ionic liquid gated nanometer scale channels of strontium titanate have been carried out. At low gate voltages, the I–V characteristics exhibit a large voltage threshold for conduction and a nonlinear power law behavior at all temperatures measured. The source-drain current of these nanowires scales as a power law of the difference between the source-drain voltage and the threshold voltage. The scaling behavior of the I–V characteristic is reminiscent of collective electronic transport through an array of quantum dots. At large gate voltages, the narrow channel acts as a quasi-1D wire whose conductance follows Landauer's formula for multichannel transport.

Ionic‐Liquid Gating of InAs Nanowire‐Based Field‐Effect Transistors

“…The use of ionic liquids [11][12][13][14] for the realization of EDL transistors (EDLTs) [15] was shown to yield very high local electric fields and efficient carrier-density modulation, and was first proposed for the modulation of charge carriers in oxide- [16][17][18][19] and organic-semiconductor systems [20]. More recently, this approach was applied to nanomaterials such as 2D systems including graphene [21,22], layered transition-metal dichalcogenides [23][24][25]), quasi-1D systems such as nanotubes [26][27][28][29][30], and nanowires (NW) made from group IV and II-VI semiconductors [31][32][33][34][35][36] or oxides [37,38]. In particular, the ionic liquid EMIm-TFSI has been widely used for gating field effect devices fabricated starting from different nanostructures of diverse materials.…”

Gate‐tunable Thermoelectric Effect in Oxide Thin Films at Room Temperature

“…[19] Similarly, a high power factor of 50 μW cm −1 K −2 was obtained by ionic-liquid gating at the surface of a ZnO single crystal. [20] Ionic liquid gating on SrTiO 3 single crystal surfaces also shows remarkable tuning abilities, which results in an insulator to a metal transition, [21] an insulator to a superconductor transition, [22] nonlinear transport in SrTiO 3 nanowires, [23] tunable Kondo scattering at lower temperatures, [24] and modulations of the thermoelectric power. [25,26] However, so far, the gate tunability of the thermoelectric power factor of doped-SrTiO 3 thin films has not been exploited at temperatures relevant to thermoelectric energy harvesting.…”