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. 2015 Mar 20:5:9321.
doi: 10.1038/srep09321.

Molecular design of near-IR dyes with different surface energy for selective loading to the heterojunction in blend films

Huajun Xu  1 , Takaaki Wada  1 , Hideo Ohkita  2 , Hiroaki Benten  1 , Shinzaburo Ito  1
Affiliations

Molecular design of near-IR dyes with different surface energy for selective loading to the heterojunction in blend films

Huajun Xu et al. Sci Rep. .

Abstract

We have synthesized three silicon phthalocyanine dyes with different hydrophobic substituents in order to control surface energy in the solid state, aiming at selective loading of the dyes into blend films of poly(3-hexylthiophene) (P3HT) and polystyrene (PS). These three dyes are differently located at P3HT domains, at P3HT/PS interface, and at PS domains, respectively, which are fully consistent with the locations predicted by the wetting coefficient derived from the surface energy of each material.

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Figures

Figure 1
Figure 1. Dependence of surface energy of RRa-P3HT/dye (closed symbols) and PS/dye (open symbols) binary blend films on the dye concentration: a) dye = BuSiPc6, b) dye = SiPc6, and c) dye = SiPcBz.
Figure 2
Figure 2
Absorption spectra of RRa-P3HT/PS/BuSiPc6 ternary blend films with a weight ratio of 2:2:1 a) before and b) after the pentane treatment, and c) after the cyclohexane treatment. AFM images of the ternary blend films d) before and e) after the pentane treatment, and f) after the cyclohexane treatment. The cross-sectional line profiles along the white lines indicated in the corresponding AFM images g) before and h) after the pentane treatment, and i) after the cyclohexane treatment.
Figure 3
Figure 3
Absorption spectra of RRa-P3HT/PS/SiPc6 ternary blend films with a weight ratio of 2:2:1 a) before and b) after the pentane treatment, and c) after the cyclohexane treatment. AFM images of the ternary blend films d) before and e) after the pentane treatment, and f) after the cyclohexane treatment. The cross-sectional line profiles along the white lines indicated in the corresponding AFM images g) before and h) after the pentane treatment, and i) after the cyclohexane treatment.
Figure 4
Figure 4
Absorption spectra of RRa-P3HT/PS/SiPcBz ternary blend films with a weight ratio of 2:2:1 a) before and b) after the pentane treatment, and c) after the cyclohexane treatment. AFM images of the ternary blend films d) before and e) after the pentane treatment, and f) after the cyclohexane treatment. The cross-sectional line profiles along the white lines indicated in the corresponding AFM images g) before and h) after the pentane treatment, and i) after the cyclohexane treatment.
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