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.

Ganzer, L., Zappia, S., Russo, M., Ferretti, A., Vohra, V., Diterlizzi, M., et al. (2020). Ultrafast spectroscopy on water-processable PCBM: Rod-coil block copolymer nanoparticles. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 22(45), 26583-26591 [10.1039/d0cp05478j].

Ultrafast spectroscopy on water-processable PCBM: Rod-coil block copolymer nanoparticles

Vohra V.;Diterlizzi M.;
2020

Abstract

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.
Articolo in rivista - Articolo scientifico
nanoparticles; spectroscopy;
English
26583
26591
9
Hybrid Gold Open Access
Ganzer, L., Zappia, S., Russo, M., Ferretti, A., Vohra, V., Diterlizzi, M., et al. (2020). Ultrafast spectroscopy on water-processable PCBM: Rod-coil block copolymer nanoparticles. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 22(45), 26583-26591 [10.1039/d0cp05478j].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/347471
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