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- W2895764989 abstract "Abstract The packing mode of small‐molecular semiconductors in thin films is an important factor that controls the performance of their optoelectronic devices. Designing and changing the packing mode by molecular engineering is challenging. Three structurally related diketopyrrolopyrrole (DPP)‐based compounds were synthesized to study the effect of replacing C−C bonds by isoelectronic dipolar B←N bonds. By replacing one of the bridging C−C bonds on the peripheral fluorene units of the DPP molecules by a coordinative B←N bond and changing the B←N bond orientation, the optical absorption, fluorescence, and excited‐state lifetime of the compounds can be tuned. The substitution alters the preferential aggregation of the molecules in the solid state from H‐type (for C−C) to J‐type (for B←N). Introducing B←N bonds thus provides a subtle way of controlling the packing mode. The photovoltaic properties of the compounds were evaluated in bulk heterojunctions with a fullerene acceptor and showed moderate performance as a consequence of suboptimal morphologies, bimolecular recombination, and triplet‐state formation." @default.
- W2895764989 created "2018-10-12" @default.
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- W2895764989 date "2018-12-10" @default.
- W2895764989 modified "2023-10-16" @default.
- W2895764989 title "Adjusting Aggregation Modes and Photophysical and Photovoltaic Properties of Diketopyrrolopyrrole‐Based Small Molecules by Introducing B←N Bonds" @default.
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