Nanotextured PEDOT:Tos layers from block copolymer lithography

Florent Pawula (1) , Solène Perrot (1) , Georges Hadziioannou (1) , Guillaume Fleury (1)

1 Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies

Among functional materials, π-conjugated polymers are very attractive for large-scale or wearable applications thanks to their electronic and soft-matter properties. Poly(3,4ethylenedioxythiophene) (PEDOT) based materials are often considered as the flagships of polymer electronics. Indeed, their tunable doping level affords various electronic transport behaviors, i.e. metallic, semi-metallic, or semiconductor , with respect to the targeted applications. Furthermore, reducing the size of functional objects is a cornerstone of the semiconductor industry's drive for improved performance. Hence, the nanopatterning of πconjugated polymers and its relationship to electronic behavior is of high interest for future developments in polymer electronics. Here we report the texturation of PEDOT:Tos thin films at the nanometer scale via block copolymer lithography using self-assembled poly(styrene)block-poly(methyl methacrylate) (PS-b-PMMA) layers as masks. By means of imaging and electronic spectral analyses, we demonstrate that doped-PEDOT nanostructures can be obtained by this process through a re-doping treatment, enabling the recovery of the majority of the electronic states of the nanotextured PEDOT:Tos layer.

Mots clés: polymer electronics; PEDOT; Block copolymer lithography

Domaines: Polymères; Micro et nanotechnologies/Microélectronique

Florent Pawula, Solène Perrot, Georges Hadziioannou, Guillaume Fleury. Nanotextured PEDOT:Tos layers from block copolymer lithography. Organic Electronics, 2023, 118, pp.106806. ⟨10.1016/j.orgel.2023.106806⟩. ⟨hal-04094881⟩