The choice of molecular material plays a crucial role in improving the performance of organic solar cells. Herein, two coumarin‐based small molecules are designed and synthesized in which the π‐system is extended by the introduction of double bonds. The molecules are differed by the attachment of central acceptor units. The replacement of the carbonyl group in C3 by the dicyanomethylene unit in C3–CN red‐shift the absorption, reduced the energy gap, and stabilized the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. When blended with a complementary absorbing all‐fused acceptor F13, the binary devices using C3 donor delivered a power conversion efficiency (PCE) of 11.09%. In contrast, C3–CN:F13‐based binary device displayed an impressive PCE of 14.84% due to the obvious increase in all open circuit voltage, short circuit current density, and fill factor values. The inclusion of CN group to the molecular backbone induces a tighter intermolecular packing, which is beneficial for the charge transport properties. The study demonstrates that the subtle modification in conjugation length and tuning of the energy level by the proper choice of acceptor could be a promising way to improve the device's performance.

Structurally characterized porous Ag(I)-molecular cage, AgMOC and Cu(II)-coordination polymer, CuCP with a premeditated ligand, 1,3-bis(((E)-2-methoxybenzylidene)amino)propan-2-ol and its parental amine with thiocyanate, respectively are reported to harness electrical mobility-driven hydrogen evolution...

The sustainable production of privileged amines by the catalytic reduction of nitriles with an inexpensive silane polymethylhydrosiloxane (PMHS) grabs a great promise to replace conventional synthetic routes having limited applicability...

Binary Organic Solar Cells In article number http://doi.wiley.com/10.1002/solr.202300032, Ganesh D. Sharma, Amaresh Mishra, and co‐workers present a donor‐acceptor substituted coumarin donor and all‐fused fullerene‐free acceptor for high efficiency binary organic solar cells.