Low-Temperature Behaviour of Charge Transfer Excitons in Narrow-Bandgap Polymer-Based Bulk Heterojunctions
| Autor: | Hans-Joachim Egelhaaf, Dorota Jarzab, Fabrizio Cordella, Markus C. Scharber, Maria Antonietta Loi, Jio Gao |
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| Přispěvatelé: | Zernike Institute for Advanced Materials, Photophysics and OptoElectronics |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Photoluminescence EFFICIENCY Organic solar cell Band gap Exciton Quantum yield RECOMBINATION 02 engineering and technology 010402 general chemistry FILMS 01 natural sciences 7. Clean energy Molecular physics BLENDS PHOTOVOLTAIC PERFORMANCE Condensed Matter::Materials Science ORGANIC SOLAR-CELLS ELECTROLUMINESCENCE General Materials Science Biexciton Renewable Energy Sustainability and the Environment Condensed Matter::Other Heterojunction Charge (physics) 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect TRANSPORT 0104 chemical sciences OPEN-CIRCUIT VOLTAGE TRANSFER STATES Atomic physics 0210 nano-technology |
| Zdroj: | Advanced Energy Materials, 1(4), 604-609. WILEY-V C H VERLAG GMBH Advanced Energy Materials |
| ISSN: | 1614-6832 |
| Popis: | Photoluminescence studies of the charge transfer exciton emission from a narrow-bandgap polymer-based bulk heterojunction are reported. The quantum yield of this emission is as high as 0.03%. Low temperature measurements reveal that while the dynamics of the singlet exciton is slower at low temperature, the dynamics of the charge transfer exciton emission is temperature independent. This behavior rules out any diffusion process of the charge transfer excitons and energy transfer from these interfacial states toward lower lying states. Photoluminescence measurements performed on the device under bias show a reduction (but not the total suppression) of the charge transfer exciton recombination. Finally, based on the low temperature results the role of the charge transfer excitons and the possible pathways to populate them are identified. |
| Databáze: | OpenAIRE |
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