Investigation of aging and restoration of polyethylene-oxide cesium-perchlorate solid polymer electrolyte used for ion doping of a WSe2 field-effect transistor

Transition metal dichalcogenides (TMDs) are of interest for tunnel field-effect transistors (TFETs) [1]. Their ultrathin body, absence of dangling bonds and native oxides, robustness to short channel effects, dielectric mediated mobilities, and the presence of a band gap are all favorable for use in TFETs. However, doping methods are needed for TMDs to create the p-n junction required for the TFET. Charge transfer doping [2] and ion-doping using solid polymers [3] are two approaches being explored. In this paper we show for the first time, the use of polyethylene oxide (PEO) and the salt, CsClO4, to induce both n and p channel conductivity in exfoliated WSe2 FETs.