Synthetic Routes to TEG‐Substituted Diketopyrrolopyrrole‐Based Low Band‐Gap Polymers

Abstract

We report herein general synthetic routes to novel TEG‐functionalized DPP‐based co‐polymers (TEG = triethylene glycol; DPP = diketopyrrolopyrrole) that display alternating TEG‐substituted DPP moieties with various functionalized donor units; donor units contain moieties such as polythiophene segments decorated with thermocleavable tertiary esters or additional TEG chains and alkoxy‐substituted benzodithiophenes. The synthetic approaches are based on Stille coupling chemistry or, for the first time for TEG‐substituted DPP‐based polymers, on direct heteroarylation polymerizations. Spectroscopic and electrochemical characterization as well as preliminary tests in photovoltaic cells are also reported.