Preprint Communication Version 1 This version is not peer-reviewed

Fullerene Aggregation in Thin Films of Polymer Blends for Solar Cell Applications

Version 1 : Received: 30 September 2018 / Approved: 30 September 2018 / Online: 30 September 2018 (16:35:40 CEST)

A peer-reviewed article of this Preprint also exists.

Lindqvist, C.; Moons, E.; van Stam, J. Fullerene Aggregation in Thin Films of Polymer Blends for Solar Cell Applications. Materials 2018, 11, 2068. Lindqvist, C.; Moons, E.; van Stam, J. Fullerene Aggregation in Thin Films of Polymer Blends for Solar Cell Applications. Materials 2018, 11, 2068.

Journal reference: Materials 2018, 11, 2068
DOI: 10.3390/ma11112068

Abstract

We report on the effects of the film morphology on the fluorescence spectra for a thin film including a quinoxaline-based co-polymer (TQ1) and a fullerene derivative (PC70BM). The ratio between the polymer and the fullerene derivative, as well as the processing solvent were varied. Beside the main emission peak at 700 nm in the fluorescence spectra of thin films of this phase-separated blend, a broad emission band is observed with a maximum at 520 - 550 nm. The intensity of this emission band decreases with an increasing degree of mixing in the film and becomes most prominent in thicker films, films with high PC70BM content, and films that were spin-coated from solvents with lower PC70BM solubility. We assign this emission band to aggregated PC70BM.

Subject Areas

fullerene aggregation; organic solar cells; fluorescence; organic photovoltaics

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