Abstract Oligomers and regioregular copolymers based on fluorenone subunits are synthesized and used in bulk‐heterojunction photovoltaic cells. These are 2,7‐bis(5‐[( E )‐1,2‐bis(3‐octylthien‐2‐yl)ethylene])‐fluoren‐9‐one (TVF), the product of its oxidative polymerization, that is, (poly[(5,5′‐(bis‐...
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