Ozdemir, MehmetKim, Sang WooKim, HyungsugKim, Myung-GilKim, Bumjoon J.Kim, ChoongikUsta, Hakan2025-09-252025-09-2520182199-160Xhttps://doi.org/10.1002/aelm.201700354https://hdl.handle.net/20.500.12573/4620Usta, Hakan/0000-0002-0618-1979; Kim, Bumjoon/0000-0001-7783-9689;The synthesis, physicochemical, and optoelectronic properties of a new class of low band-gap (approximate to 1.3 eV) donor-acceptor copolymers based on a highly electron-deficient meso-5-(2-octyldodecyl)thiophene-substituted BODIPY pi-unit are presented. The polymeric solutions exhibit strong aggregation-dependent excitonic properties indicating the presence of enhanced pi-coherence as a result of strong interchain interactions. The polymeric semiconductor thin films prepared by spin coating show isotropic nodule-like grains with essentially no ordering in the out-of-plane direction. Field-effect hole mobilities of 0.005 cm(2) V-1.s(-1) are observed in bottom-gate top-contact organic field-effect transistors, and inverted bulk-heterojunction organic photovoltaics employing the polymer:PC71BM active layer exhibit excellent power conversion efficiencies of 6.2% with a short-circuit current of 16.6 mA cm(-2). As far as it is known, this is a record high value achieved to date for a boron-containing donor polymer in the photovoltaic literature indicating a significant enhancement in power conversion efficiency (>3-4 times). The findings clearly present that rationally designed BODIPY-based donor-acceptor copolymers can be a key player in photovoltaic applications.eninfo:eu-repo/semantics/closedAccessBODIPYDonor-Acceptor CopolymersField-Effect TransistorsPhotovoltaicsSemiconducting PolymersConference Object10.1002/aelm.2017003542-s2.0-85038102431