Stretchable OFET Memories: Tuning the Morphology and the Charge-Trapping Ability of Conjugated Block Copolymers through Soft Segment Branching

The mechanical properties and structural design flexibility of charge-trapping polymer electrets have led to their widespread use in organic field-effect transistor (OFET) memories. For example, the polyfluorene-based conjugated/insulating block copolymers (BCPs), confined fiberlike polyfluorene nanostructures insulating matrix act as effective hole-trapping sites, leading controllable memory performance through BCPs. However, few studies reported intrinsically stretchable materials device applications, a practical method correlate thin-film morphology BCP with ability has not yet been developed. In this study, series new BCPs, poly(9,9-di-n-hexyl-2,7-fluorene)-block-poly(δ-decanolactone)s (PF-b-PDLx, x = 1–3), are reported. linear branched PDL blocks comparable molecular weights were used investigate effect architecture on performance. Moreover, coverage area nanofibers films was extracted from atomic force microscopy images, which can be correlated trapping density electrets. segments only improve stretchability but also tailor crystallinity phase separation thus increasing ability. OFET PF-b-PDL3 electret layer exhibited largest window (102 V) could retain its at up 100% strain. This research highlights importance for developing materials.