Multiscale Study of Strain-Dependent Charge Transport in Deformable Conjugated Polymers
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Maintaining good charge-carrier transport while deforming semiconducting layers is critical for their potential application in stretchable electronics. However, only a small number of conjugated polymers have been reported to retain their original charge-carrier transport when deformed. Herein, the structural requirements for diketopyrrolopyrrole (DPP)-based conjugated polymers are reported to avoid the loss of electrical properties during deformation. Inclusion of a flexible donor moiety between DPP acceptors reduces crystalline packing and dramatically enhances mechanical deformability. Furthermore, in DPP polymers with flexible donor moieties, strain-induced flattening of polymer chains is observed, lowering the energy barrier for hopping transport. Stretchable transistors with remarkable charge-carrier mobility under strain up to 80% are achieved by controlling the backbone flexibility of conjugated polymer.