Bipolar charge transport in organic electron donor-acceptor systems with stable organic radicals as electron-withdrawing moieties
Two very stable organic radical adducts 1 and 2 formed by an electron donor-acceptor system with bipolar charge transport behavior have been investigated. Both present the same electron donor moiety, 3,6-bis(N-carbazolyl)carbazole, and are distinguished by the paramagnetic electron-withdrawing moiet...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/200816 |
| Acceso en línea: | http://hdl.handle.net/10261/200816 |
| Access Level: | acceso abierto |
| Palabra clave: | Band gap Absorptivity Bipolar charge Cyclic voltammetry Organic radicals |
| Sumario: | Two very stable organic radical adducts 1 and 2 formed by an electron donor-acceptor system with bipolar charge transport behavior have been investigated. Both present the same electron donor moiety, 3,6-bis(N-carbazolyl)carbazole, and are distinguished by the paramagnetic electron-withdrawing moiety, tris(2,3,5,6-tetrachlorophenyl)methyl radical (DTM) in 1 and tris(2,4,6-trichlorophenyl)methyl radical (TTM) in 2. They exhibit low band gaps (difference between HOMO and LUMO orbitals), 1.54 and 1.81 eV for 1 and 2, respectively, absorbing in the visible rang of the electromagnetic spectrum. Both radical adducts present suitable charge transport results with the DTM derivative 1 showing the best performance. Thus, 1 with higher structural congestion displays a well-balanced ambipolar behavior and the highest hole and electron mobility values. © 2019 John Wiley & Sons, Ltd. |
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