Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt
| Autor: | Desiré Molina, Werther Cambarau, Aurelien Viterisi, Fernando Fernández-Lázaro, Ángela Sastre-Santos, Lluis F. Marsal, Sara Pla, Emilio Palomares, María Pilar Montero-Rama, Caterina Stenta |
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| Přispěvatelé: | Departamentos de la UMH::Farmacología, Pediatría y Química Orgánica |
| Rok vydání: | 2018 |
| Předmět: |
Electron mobility
Materials science Organic solar cell perylenediimide General Chemical Engineering 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences Article Polymer solar cell lcsh:Chemistry chemistry.chemical_compound Thiophene General Materials Science HOMO/LUMO chemistry.chemical_classification organic solar cells Electron acceptor 021001 nanoscience & nanotechnology Acceptor 0104 chemical sciences photovoltaics non-fullerene acceptor PTB7 bulkheterojunction 547 - Química orgánica lcsh:QD1-999 chemistry Charge carrier 0210 nano-technology |
| Zdroj: | REDIUMH. Depósito Digital de la UMH instname Nanomaterials; Volume 8; Issue 4; Pages: 211 Nanomaterials, Vol 8, Iss 4, p 211 (2018) Nanomaterials |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano8040211 |
| Popis: | Two new perylenediimides (PDIs) have been developed for use as electron acceptors in solution-processed bulk heterojunction solar cells. The compounds were designed to exhibit maximal solubility in organic solvents, and reduced aggregation in the solid state. In order to achieve this, diphenylphenoxy groups were used to functionalize a monomeric PDI core, and two PDI dimers were bridged with either one or two thiophene units. In photovoltaic devices prepared using PDI dimers and a monomer in conjunction with PTB7, it was found that the formation of crystalline domains in either the acceptor or donor was completely suppressed. Atomic force microscopy, X-ray diffraction, charge carrier mobility measurements and recombination kinetics studies all suggest that the lack of crystallinity in the active layer induces a significant drop in electron mobility. Significant surface recombination losses associated with a lack of segregation in the material were also identified as a significant loss mechanism. Finally, the monomeric PDI was found to have sub-optimum LUMO energy matching the cathode contact, thus limiting charge carrier extraction. Despite these setbacks, all PDIs produced high open circuit voltages, reaching almost 1 V in one particular case This work was supported by the Spanish Ministry of Economy, Industry and Competitiveness (MEIC) (TEC2015-71324-R, CTQ2014-55798-R and TEC2015-71915-REDT (MINECO/FEDER)) This work was supported by the Catalan Institution for Research and Advanced Studies (ICREA) (ICREA “Academia Award”, AGAUR 2017 SGR 017SGR1527) |
| Databáze: | OpenAIRE |
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