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Enhanced thermal stability of a polymer solar cell blend induced by electron beam irradiation in the transmission electron microscope

Olof Bäcke (Institutionen för fysik, Eva Olsson Group (Chalmers)) ; Camilla Lindqvist (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Amaia Diaz de Zerio Mendaza (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Stefan Gustafsson (Institutionen för fysik, Eva Olsson Group (Chalmers)) ; Ergang Wang (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Mats R. Andersson (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Christian Müller (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Per Magnus Kristiansen ; Eva Olsson (Institutionen för fysik, Eva Olsson Group (Chalmers))
Ultramicroscopy (03043991). Vol. 173 (2017), p. 16-23.
[Artikel, refereegranskad vetenskaplig]

We show by in situ microscopy that the effects of electron beam irradiation during transmission electron microscopy can be used to lock microstructural features and enhance the structural thermal stability of a nanostructured polymer:fullerene blend. Polymer:fullerene bulk-heterojunction thin films show great promise for use as active layers in organic solar cells but their low thermal stability is a hindrance. Lack of thermal stability complicates manufacturing and influences the lifetime of devices. To investigate how electron irradiation affects the thermal stability of polymer:fullerene films, a model bulk-heterojunction film based on a thiophene-quinoxaline copolymer and a fullerene derivative was heat-treated in-situ in a transmission electron microscope. In areas of the film that exposed to the electron beam the nanostructure of the film remained stable, while the nanostructure in areas not exposed to the electron beam underwent large phase separation and nucleation of fullerene crystals. UV–vis spectroscopy shows that the polymer:fullerene films are stable for electron doses up to 2000 kGy.

Nyckelord: Crosslinking, Electron irradiation. In-situ transmission electron microscopy, Organic solar cells, Thermal stability



Denna post skapades 2017-01-30. Senast ändrad 2017-03-31.
CPL Pubid: 247879

 

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