Abstract
A series of new donor-acceptor (D-A) functionalized diketopyrrolopyrrole (DPP) derivatives bearing different electron-donating and electron-withdrawing substituents at the terminal thiophene units were synthesized by palladium-catalyzed cross-coupling reactions. The introduction of different substituent groups can influence the properties of these DPP dyes. The optical and electrochemical properties of these synthesized DPP dyes ( DPP1 – DPP4 ) were investigated by UV-Vis and steady-state fluorescence spectroscopy and cyclic voltammetry (CV). They have 1.61–2.28 eV of band gaps and appropriate energy levels, the bistriphenyl amine (TPA) substituted DPP2 shows a strong absorption band reaching in the near-infrared (NIR) region, which is a highly desirable feature for application in organic photovoltaics.
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