Solution‐Processed, Insoluble Thin Films through In Situ Chemical Polymerization of Semiconducting Native Polythiophene

Abstract

The use of multilayer, solution‐processed organic thin film devices can benefit strongly from the controlled deposition of insoluble thin films. Here, a solution‐based in situ polymerization technique for semiconducting polythiophene thin films based on nonchlorinated solvents forming a range of large‐scale structured or homogeneous, insoluble thin films is systematically developed. The high‐quality nature of the resulting polythiophene thin films is demonstrated by successfully implementing the films in the active layer of bilayer heterojunction solar cells. It is possible to transfer this protocol to large‐scale processing without additional changes to the material system.