Based on our earlier crystallization studies on the semiconducting polymer poly(3-hexylthiophene)1 my talk will give an overview about our recent findings on structure-function relationships of n-type donor-acceptor copolymer films based on poly{[N,N’-bis(2-octyldodecyl)-1,4,5,8-naphthalenediimide-2,6-diyl]-alt-5,5’-(2,2’-bithiophene) (P(NDI2OD-T2)).2 The strong aggregation tendency of this polymer is particularly useful for the preparation of highly anisotropic structures. On the mesoscopic scale we give new insights in the structure formation upon solution deposition. A morphology analysis shows that the deposited films are based on characteristic fiber morphologies where the fiber and chain directions are coinciding.3 The involvement of liquid-crystalline phases, in particular nematic-like preordering in highly concentrated solutions is demonstrated. Solvent vapor annealing is shown to lead to large area alignment in spherulite-like superstructures with semi-crystalline structures. Particularly nice is the applicability of blade-coating to achieve highly anisotropic films where both the bulk and the surface morphology can be determined: whereas blade-coated films after 220°C annealing give evidence for face-on orientation in the bulk with segregated stacking in polymorph Form I, 300°C annealing leads to an edge-on orientation with mixed stacking in Form II.3,4 All films have a top edge-on layer. Using these well-defined morphologies we can access detailed insights into electrochemical and chemical doping mechanisms.5

Controlled crystallization studies of n-type donor-acceptor copolymer films

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.