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Nano-pathways: Bridging the divide between water-processable nanoparticulate and bulk heterojunction organic photovoltaics

N. P. Holmes ; M. Marks ; P. Kumar ; R. Kroon ; M. G. Barr ; N. Nicolaidis ; K. Feron ; A. Pivrikas ; A. Fahy ; Amaia Diaz de Zerio Mendaza (Institutionen för kemi och kemiteknik, Polymerteknologi) ; A. L. D. Kilcoyne ; Christian Müller (Institutionen för kemi och kemiteknik, Polymerteknologi) ; X. J. Zhou ; Mats R. Andersson (Institutionen för kemi och kemiteknik, Polymerteknologi) ; P. C. Dastoor ; W. J. Belcher
Nano Energy (2211-2855). Vol. 19 (2016), p. 495-510.
[Artikel, refereegranskad vetenskaplig]

Here we report the application of a conjugated copolymer based on thiophene and quinoxaline units, namely poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-di yl] (TQ1), to nanoparticle organic photovoltaics (NP-OPVs). TQ1 exhibits more desirable material properties for NP-OPV fabrication and operation, particularly a high glass transition temperature (T-g) and amorphous nature, compared to the commonly applied semicrystalline polymer poly(3-hexylthiophene) (P3HT). This study reports the optimisation of TQ1:PC71BM (phenyl C-71 butyric acid methyl ester) NP-OPV device performance by the application of mild thermal annealing treatments in the range of the T-g (sub-T-g and post-T-g), both in the active layer drying stage and post-cathode deposition annealing stage of device fabrication, and an in-depth study of the effect of these treatments on nanoparticle film morphology. In addition, we report a type of morphological evolution in nanoparticle films for OPV active layers that has not previously-been observed, that of PC71BM nano-pathway formation between dispersed PC71BM-rich nanoparticle cores, which have the benefit of making the bulk film more conducive to charge percolation and extraction.

Nyckelord: Water processable solar cells, Nanoparticle, Organic photovoltaic, Blend morphology, Glass transition



Denna post skapades 2016-03-09.
CPL Pubid: 232946

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Polymerkemi

Chalmers infrastruktur