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Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV–vis Spectroscopy

Camilla Lindqvist (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Christian Müller (Institutionen för kemi- och bioteknik, Polymerteknologi)
Macromolecular Chemistry and Physics (1022-1352). Vol. 215 (2014), 6, p. 530-535.
[Artikel, refereegranskad vetenskaplig]

A simple technique is demonstrated based on UV–vis spectroscopy that permits the onset of fullerene crystallization to be monitored in polymer:fullerene bulk-heterojunction blends. The growth of fullerene crystals only occurs during thermal annealing above the glass transition temperature (Tg) of the blend. Light scattering due to the presence of micrometer-sized fullerene crystals reduces the apparent transmittance, which can serve as a clear indicator for the upper limit of the Tg. This principle is used to deduce this critical parameter for two high-performance photovoltaic blends that are based on a thiophene–quinoxaline and a thiophene–isoindigo copoly­mer, respectively. High Tgs of 115 and 145 °C promise good thermal stability.

Denna post skapades 2014-04-02. Senast ändrad 2014-09-02.
CPL Pubid: 196092


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)



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