Theoretical study on mesoscopic-size impurity effects in the charge separation process of organic photocells
Literature Information
Motomichi Tashiro, Takahito Nakajima
A bulk-heterojunction structure is often employed to develop high-performance organic photocells, in which the donor and acceptor regions are complexly intertwined. In such situations, mesoscopic-scale islands and peninsulas that compose the donor materials may be formed in the acceptor region. Alternatively, the donor region may extend deeply into the acceptor region. This yields mesoscopic-size impurities that can create obstacles in the charge separation (exciton dissociation) process of organic photocells and prevents the dissociation of excitons (electron–hole pairs). We previously reported on the effect of the cooperative behavior between the hot charge transfer (CT) state and the dimensional (entropy) effect on the charge separation process. In this paper, we discuss the mesoscopic-scale impurity effect on the charge separation process in PCBM acceptor models by considering the hot CT state and dimensional effects. In addition, we discuss atomic-scale effects such as molecular distortions and conformation changes using molecular dynamics (MD) simulations.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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