Carborane-based polymers: a novel class of semiconductors with tunable properties

Literature Information

Publication Date 2017-04-03
DOI 10.1039/C7CP00835J
Impact Factor 3.676
Authors

B. Dong, A. Oyelade, J. A. Kelber


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Abstract

Semiconducting boron carbides based on cross-linked carborane (B10C2H12) icosahedra, developed several decades ago, are of significant interest in a variety of emerging areas, including photocatalysis, spintronics, and especially neutron detection. These materials, however, display generally poor charge carrier mobility, high defect levels and other properties that pose significant drawbacks. A class of nanocomposite carborane-based materials has recently been developed, that addresses many of these issues. The films consist of polymerized mixtures of carboranes and aromatic species, including benzene, 1,4-diaminobenzene, pyridine or aniline. In these materials, electronic states corresponding to the aromatic moiety appearing near the top of the valence band, and states associated with the carborane moiety occupy the bottom of the conduction band. Band gap energies are substantially reduced relative to films without aromatic content. Transport measurements also indicate that charge scattering lifetimes are substantially enhanced in aromatic/carborane films compared to corresponding films without aromatic content. This combination of superior electron–hole separation, narrower band gaps, and superior charge scattering lifetimes, yields markedly enhanced charge collection in neutron voltaics studies compared to conventional carborane-derived boron carbides. The implications of these enhanced properties for neutron detection and other applications are discussed.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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