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We carried out optical pump-terahertz (THz) probe measurements to investigate the charge carrier dynamics of diketopyrrolopyrrole-linked tetrabenzoporphyrin (DPP-BP) thin films. In contrast to tetrabenzoporphyrin, DPP-BP exhibits broad and intense absorption, ranging from the visible and near infrared region. After the photoexcitation at 400 nm, we observed an instantaneous appearance of transient...
We performed optical pump-terahertz (THz) probe measurements to investigate the charge carrier dynamics of benzoporphyrin (BP) and BP-based bulk heterojunction (BHJ) thin films. In both samples, we observed an instantaneous appearance of transient THz signals which are attributed to polaron pairs. These polaron pairs recombine and/or trap in a defect site to localize within 1 ps time scale. From analysis...
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