Ultrafast spectroscopy on water-processable PCBM: Rod-coil block copolymer nanoparticles
| Autor: | Lucia, Ganzer, Stefania, Zappia, Mattia, Russo, Anna Maria, Ferretti, Varun, Vohra, Marianna, Diterlizzi, Maria Rosa, Antognazza, Silvia, Destri, Tersilla, Virgili |
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| Přispěvatelé: | Ganzer, L, Zappia, S, Russo, M, Ferretti, A, Vohra, V, Diterlizzi, M, Antognazza, M, Destri, S, Virgili, T |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | PCCP. Physical chemistry chemical physics (2020). doi:10.1039/D0CP05478J info:cnr-pdr/source/autori:Lucia Ganzer, Stefania Zappia, Mattia Russo, Anna Maria Ferretti, Varun Vohra, Marianna Diterlizzi, Maria Rosa Antognazza, Silvia Destri and Tersilla Virgili/titolo:Ultrafast spectroscopy on water-processable PCBM: rod-coil block copolymer nanoparticles/doi:10.1039%2FD0CP05478J/rivista:PCCP. Physical chemistry chemical physics (Print)/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| Popis: | Using ultrafast spectroscopy, we investigate the photophysics of water-processable nanoparticles composed of a block copolymer electron donor and a fullerene derivative electron acceptor. The block copolymers are based on a poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] rod, which is covalently linked with 2 or 100 hydrophilic coil units. In both samples the photogenerated excitons in the blend nanoparticles migrate in tens of ps to a donor/acceptor interface to be separated into free charges. However, transient absorption spectroscopy indicates that increasing the coil length from 2 to 100 units results in the formation of long living charge transfer states which reduce the charge generation efficiency. Our results shed light on the impact of rod-coil copolymer coil length on the blend nanoparticle morphology and provide essential information for the design of amphiphilic rod-coil block copolymers to increase the photovoltaic performances of water-processable organic solar cell active layers. |
| Databáze: | OpenAIRE |
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