TPU-PEDOT:PSS Bilayer with Excellent Adhesive Properties Enabling Fabrication of High-Performance and Intrinsically-Stretchable Organic Solar Cells

Abstract

Replacing rigid metal oxide electrodes and glass substrates with more flexible polymeric materials is one of the urgent challenges for commercialization of wearable electronic devices. Here, we fabricated intrinsically−stretchable organic solar cells (IS−OSCs) utilizing thermoplastic urethane (TPU) and poly(3,4−ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The interdiffused bilayer in the molecular interdiffusion (MID)−based TPU−PEDOT:PSS affords strongly adhesive interfaces with fracture energy (Gc) =45.0 J m-2. Finally, we demonstrate highly efficient (PCE = 13.1%) and highly stretchable (strain at PCE80% = 34%) IS−OSCs when the PM6:Y6−BO:N2200−based active layer was used. These our findings provide a useful strategy for the developmentofstretchable transparent electrodes and demonstrate the importance of interfacial adhesion properties in achieving efficient and highly stretchable IS-OSCs.