Abstract
We report the synthesis of poly[(3-hexylthiophene)-block-(3-(4,4,5,5,6,6,7,7,7-nonafluoroheptyl)thiophene)], P(3HT-b-3SFT), carried out by the Grignard Metathesis Method (GRIM). The copolymers composition was determined by 1H and 19F NMR spectroscopies, and gel permeation chromatography (GPC). The thin films of P(3HT-b-3SFT) were investigated by ultraviolet-visible absorption spectroscopy and atomic force microscopy (AFM). We also fabricated bulk-hetero junction (BHJ) solar cells based on blends of P(3HT-b-3SFT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Although the composition ratio of P3SFT in P(3HT-b-3SFT) was low, the influence of P3SFT on the morphology and properties of solar cells was significant. The annealing process for the BHJ solar cells induced the formation of large domains and led to poor solar cell performance. The BHJ solar cells, based on PCBM and P(3HT-b-3SFT), prepared by the non-annealing process, had a maximum power conversion efficiency of 0.84% under 100 mW/cm2 (AM 1.5 solar illumination) in air.
Highlights
The bulk heterojunction (BHJ) solar cells, consisting of π-conjugated polymers as donor and fullerene derivatives as acceptor, have the advantage of low cost fabrication and easy processing due to solution based low temperature processes
The P3HT homopolymer (8) was synthesized, because the P3SFT homopolymer was immediately deposited from the polymerization system
We fabricated solar cells based on the blends of P(3HT-b-3SFT)s and phenyl-C61-butyric acid methyl ester (PCBM), which showed phase separation as expected
Summary
The bulk heterojunction (BHJ) solar cells, consisting of π-conjugated polymers as donor and fullerene derivatives as acceptor, have the advantage of low cost fabrication and easy processing due to solution based low temperature processes. We attempted to construct an interpenetrating networks structure of the donor and acceptor phase in the photoactive layer using, self-assembly of diblock copolymer, and fluorine property. It is well known that several diblock copolymers containing various conjugated segments self-assemble and form a nano-scale separated structure This behavior improves the crystallinity of polymer film for organic electronic devices, so some diblock copolymers based on alkyl-thiophene were synthesized [14,15,16,17], and the organic devices have been fabricated [18,19]. We report on diblock copolymers that consist of thiophenes with hydrocarbon and fluorinated carbon chains to construct the interpenetrating network structures of the donor and acceptor phase in the photoactive layer. The composition and characteristics of the diblock copolymer and the performance of the solar cells fabricated with P(3HT-b-3SFT):PCBM blend were studied
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