Exploring the origin of high optical absorption in conjugated polymers
| Autor: | Vezie, M. S., Few, S., Meager, I., Pieridou, Galatia K., Dörling, B., Ashraf, R. S., Goñi, A. R., Bronstein, H., McCulloch, I., Hayes, Sophia C., Campoy-Quiles, M., Nelson, J. |
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| Přispěvatelé: | Engineering and Physical Sciences Research Council (UK), University of Cyprus, Ministerio de Economía y Competitividad (España), European Research Council, European Commission, Martiradonna, L, Commission of the European Communities, Engineering & Physical Science Research Council (EPSRC), The Royal Society, Hayes, Sophia C. [0000-0002-2809-6193], Dörling, Bernhard [0000-0003-3171-0526], Apollo - University of Cambridge Repository |
| Rok vydání: | 2018 |
| Předmět: |
Technology
Light 02 engineering and technology Conjugated polymers Optoelectronic devices 01 natural sciences 7. Clean energy Molecular-weight Semiconductor devices Disorder General Materials Science Quantum chemical calculations Absorption (electromagnetic radiation) chemistry.chemical_classification Persistence length Mobility Chemistry Physical Enhancement Organic polymers Physics Polymer 0303 Macromolecular and Materials Chemistry Spectra 021001 nanoscience & nanotechnology Condensed Matter Physics Diketopyrrolopyrroles Chemistry Physics Condensed Matter Mechanics of Materials Chemical physics Physical Sciences 0210 nano-technology Quantum chemistry Visible spectrum Organic optoelectronics Materials science Materials Science Transport Nanotechnology Materials Science Multidisciplinary Conjugated system Backbone structures 010402 general chemistry Physics Applied Light absorption Electromagnetic wave absorption Nanoscience & Nanotechnology Dependence Photocurrent Science & Technology business.industry Solar-cells Mechanical Engineering Other conjugated polymers Thin-films General Chemistry Extinction coefficients 0104 chemical sciences Organic semiconductor Semiconductor Electrical transport chemistry Semiconductors business |
| Zdroj: | Nature Materials Nat.Mater. Digital.CSIC. Repositorio Institucional del CSIC instname |
| DOI: | 10.17863/cam.20276 |
| Popis: | Vezie, Michelle S. et al. The specific optical absorption of an organic semiconductor is critical to the performance of organic optoelectronic devices. For example, higher light-harvesting efficiency can lead to higher photocurrent in solar cells that are limited by sub-optimal electrical transport. Here, we compared over 40 conjugated polymers, and found that many different chemical structures share an apparent maximum in their extinction coefficients. However, a diketopyrrolopyrrole-thienothiophene copolymer shows remarkably high optical absorption at relatively low photon energies. By investigating its backbone structure and conformation with measurements and quantum chemical calculations, we find that the high optical absorption can be explained by the high persistence length of the polymer. Accordingly, we demonstrate high absorption in other polymers with high theoretical persistence length. Visible light harvesting may be enhanced in other conjugated polymers through judicious design of the structure. M.S.V. and S. F. are grateful to the Engineering and Physical Sciences Research Council (EPSRC) for a doctoral training award and a CDT studentship (EP/G037515/1) respectively. G.P. and S.C.H. acknowledge the University of Cyprus for funding through the internal grant "ORGANIC". B.D., A.G. and M.C.Q. acknowledge financial support from the Ministerio de Economía y Competitividad of Spain through projects CSD2010–00044 (Consolider NANOTHERM), SEV-2015_0496 and MAT2012–37776 and the European Research Council through project ERC CoG648901. I.M., R.S.A. and I.McC. acknowledge support from the European Commission FP7 Project ArtESun (604397). J.N. is grateful to the Royal Society for a Wolfson Merit Award, and acknowledges financial support from EPSRC grants EP/K030671/1, EP/K029843/1 and EP/J017361/1. The authors thank Dr. Isabel Alonso for performing supplementary ellipsometric measurements; we thank Prof. Thomas Kirchartz, Dr. Jarvist Moore Frost, Dr. Christian Müller and Dr. Isabel Alonso for helpful discussions. |
| Databáze: | OpenAIRE |
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