Abstract
Two non-fullerene acceptors based on the indeno[1,2-b]fluorene central moiety, with selenophene or 2-vinylselenophene as π-bridges and 2-(5,6-difuoro-3-oxo-2,3- dihydro-1H-inden-1-ylidene)malononitrile as end-capping groups, i.e. FICBF-Se and FICBF-SeVi, were synthesized, and the structure-property relationships of the acceptors were systematically studied. The introduction of the vinylene group led to clearly redshifted and broader absorption and a smaller bandgap. FICBF-Se and FICBF-SeVi exhibited optical bandgaps of 1.68 and 1.54 eV, respectively. Solar cells using polymer PBDB-T as a donor and FICBF-Se as an acceptor demonstrated a power conversion efficiency (PCE) of 6.25% with a short-circuit current density (Jsc) of 11.61 mA cm−2. However, the device based on PBDB-T/FICBF-SeVi only delivered a PCE of 3.63% with a Jsc of 9.08 mA cm−2, which should be mainly because the vinylene group decreased the crystallinity and its active layer morphology showed no distinct phase separation.
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