Ozdemir, MehmetKim, Sang WooKim, HyungsugKim, Myung-GilKim, Bumjoon J.Kim, ChoongikUsta, Hakan2019-06-252019-06-252018DOI: 10.1002/aelm.201700354http://acikerisim.agu.edu.tr/xmlui/handle/20.500.12573/17The synthesis, physicochemical, and optoelectronic properties of a new class of low band-gap (?1.3 eV) donor–acceptor copolymers based on a highly electron-deficient meso-5-(2-octyldodecyl)thiophene-substituted BODIPY ?-unit are presented. The polymeric solutions exhibit strong aggregation-dependent excitonic properties indicating the presence of enhanced ?-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 cm2 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.enginfo:eu-repo/semantics/openAccessBODIPYdonor-acceptor copolymersfield-effect transistorsphotovoltaicssemiconducting polymersarticle10.1002/aelm.201700354