Efficient charge generation by relaxed charge-transfer states at organic interfaces
Interfaces between organic electron-donating (D) and electron-accepting (A) materials have the ability to generate charge carriers on illumination. Efficient organic solar cells require a high yield for this process, combined with a minimum of energy losses. Here, we investigate the role of the lowe...
| Κύριοι συγγραφείς: | , , , , , , , , , , , , , , , , |
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| Μορφή: | Journal article |
| Γλώσσα: | English |
| Έκδοση: |
Nature Publishing Group
2014
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| Θέματα: |
| _version_ | 1826277481070460928 |
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| author | Vandewal, K Albrecht, S Hoke, E Graham, K Graham, K Widmer, J Douglas, J Schubert, M Mateker, W Bloking, J Burkhard, G Sellinger, A Sellinger, A Fréchet, J Fréchet, J Amassian, A Riede, M Riede, M McGehee, MD Neher, D Salleo, A |
| author_facet | Vandewal, K Albrecht, S Hoke, E Graham, K Graham, K Widmer, J Douglas, J Schubert, M Mateker, W Bloking, J Burkhard, G Sellinger, A Sellinger, A Fréchet, J Fréchet, J Amassian, A Riede, M Riede, M McGehee, MD Neher, D Salleo, A |
| author_sort | Vandewal, K |
| collection | OXFORD |
| description | Interfaces between organic electron-donating (D) and electron-accepting (A) materials have the ability to generate charge carriers on illumination. Efficient organic solar cells require a high yield for this process, combined with a minimum of energy losses. Here, we investigate the role of the lowest energy emissive interfacial charge-transfer state (CT1) in the charge generation process. We measure the quantum yield and the electric field dependence of charge generation on excitation of the charge-transfer (CT) state manifold via weakly allowed, low-energy optical transitions. For a wide range of photovoltaic devices based on polymer:fullerene, small-molecule:C60 and polymer:polymer blends, our study reveals that the internal quantum efficiency (IQE) is essentially independent of whether or not D, A or CT states with an energy higher than that of CT1 are excited. The best materials systems show an IQE higher than 90% without the need for excess electronic or vibrational energy. © 2014 Macmillan Publishers Limited. |
| first_indexed | 2024-03-06T23:29:32Z |
| format | Journal article |
| id | oxford-uuid:6b8b249d-4839-4e1e-bc53-deec97c2d81c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:29:32Z |
| publishDate | 2014 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | oxford-uuid:6b8b249d-4839-4e1e-bc53-deec97c2d81c2022-03-26T19:04:50ZEfficient charge generation by relaxed charge-transfer states at organic interfacesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6b8b249d-4839-4e1e-bc53-deec97c2d81cMaterials SciencesEnglishSymplectic Elements at OxfordNature Publishing Group2014Vandewal, KAlbrecht, SHoke, EGraham, KGraham, KWidmer, JDouglas, JSchubert, MMateker, WBloking, JBurkhard, GSellinger, ASellinger, AFréchet, JFréchet, JAmassian, ARiede, MRiede, MMcGehee, MDNeher, DSalleo, AInterfaces between organic electron-donating (D) and electron-accepting (A) materials have the ability to generate charge carriers on illumination. Efficient organic solar cells require a high yield for this process, combined with a minimum of energy losses. Here, we investigate the role of the lowest energy emissive interfacial charge-transfer state (CT1) in the charge generation process. We measure the quantum yield and the electric field dependence of charge generation on excitation of the charge-transfer (CT) state manifold via weakly allowed, low-energy optical transitions. For a wide range of photovoltaic devices based on polymer:fullerene, small-molecule:C60 and polymer:polymer blends, our study reveals that the internal quantum efficiency (IQE) is essentially independent of whether or not D, A or CT states with an energy higher than that of CT1 are excited. The best materials systems show an IQE higher than 90% without the need for excess electronic or vibrational energy. © 2014 Macmillan Publishers Limited. |
| spellingShingle | Materials Sciences Vandewal, K Albrecht, S Hoke, E Graham, K Graham, K Widmer, J Douglas, J Schubert, M Mateker, W Bloking, J Burkhard, G Sellinger, A Sellinger, A Fréchet, J Fréchet, J Amassian, A Riede, M Riede, M McGehee, MD Neher, D Salleo, A Efficient charge generation by relaxed charge-transfer states at organic interfaces |
| title | Efficient charge generation by relaxed charge-transfer states at organic interfaces |
| title_full | Efficient charge generation by relaxed charge-transfer states at organic interfaces |
| title_fullStr | Efficient charge generation by relaxed charge-transfer states at organic interfaces |
| title_full_unstemmed | Efficient charge generation by relaxed charge-transfer states at organic interfaces |
| title_short | Efficient charge generation by relaxed charge-transfer states at organic interfaces |
| title_sort | efficient charge generation by relaxed charge transfer states at organic interfaces |
| topic | Materials Sciences |
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