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Article

Ion-Locking in Solid Polymer Electrolytes for Reconfigurable Gateless Lateral Graphene p-n Junctions

1
Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15260, USA
2
Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
3
Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15260, USA
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(5), 1089; https://doi.org/10.3390/ma13051089
Received: 1 December 2019 / Revised: 25 December 2019 / Accepted: 28 January 2020 / Published: 1 March 2020
(This article belongs to the Special Issue 2D Materials for Advanced Devices)
A gateless lateral p-n junction with reconfigurability is demonstrated on graphene by ion-locking using solid polymer electrolytes. Ions in the electrolytes are used to configure electric-double-layers (EDLs) that induce p- and n-type regions in graphene. These EDLs are locked in place by two different electrolytes with distinct mechanisms: (1) a polyethylene oxide (PEO)-based electrolyte, PEO:CsClO4, is locked by thermal quenching (i.e., operating temperature < Tg (glass transition temperature)), and (2) a custom-synthesized, doubly-polymerizable ionic liquid (DPIL) is locked by thermally triggered polymerization that enables room temperature operation. Both approaches are gateless because only the source/drain terminals are required to create the junction, and both show two current minima in the backgated transfer measurements, which is a signature of a graphene p-n junction. The PEO:CsClO4 gated p-n junction is reconfigured to n-p by resetting the device at room temperature, reprogramming, and cooling to T < Tg. These results show an alternate approach to locking EDLs on 2D devices and suggest a path forward to reconfigurable, gateless lateral p-n junctions with potential applications in polymorphic logic circuits. View Full-Text
Keywords: p-n junction; graphene; ion doping; electric double layer; polymer electrolyte p-n junction; graphene; ion doping; electric double layer; polymer electrolyte
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MDPI and ACS Style

Liang, J.; Xu, K.; Arora, S.; Laaser, J.E.; Fullerton-Shirey, S.K. Ion-Locking in Solid Polymer Electrolytes for Reconfigurable Gateless Lateral Graphene p-n Junctions. Materials 2020, 13, 1089. https://doi.org/10.3390/ma13051089

AMA Style

Liang J, Xu K, Arora S, Laaser JE, Fullerton-Shirey SK. Ion-Locking in Solid Polymer Electrolytes for Reconfigurable Gateless Lateral Graphene p-n Junctions. Materials. 2020; 13(5):1089. https://doi.org/10.3390/ma13051089

Chicago/Turabian Style

Liang, Jierui; Xu, Ke; Arora, Swati; Laaser, Jennifer E.; Fullerton-Shirey, Susan K. 2020. "Ion-Locking in Solid Polymer Electrolytes for Reconfigurable Gateless Lateral Graphene p-n Junctions" Materials 13, no. 5: 1089. https://doi.org/10.3390/ma13051089

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