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Poly[(3-hexylthiophene)-block-(3-semifluoroalkylthiophene)] for polymer solar cells.

Yamada I, Takagi K, Hayashi Y, Soga T, Shibata N, Toru T - Int J Mol Sci (2010)

Bottom Line: 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/cm(2) (AM 1.5 solar illumination) in air.

View Article: PubMed Central - PubMed

Affiliation: Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan; E-Mails: jade1cat@yahoo.co.jp (I.Y.); soga@nitech.ac.jp (T.S.); nozshiba@nitech.ac.jp (N.S.).

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 (1)H and (19)F 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-C(61)-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/cm(2) (AM 1.5 solar illumination) in air.

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The model image of phase separation of P(3HT-b-3SFT).
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f5-ijms-11-05027: The model image of phase separation of P(3HT-b-3SFT).

Mentions: The surface morphology of the thin film of P3HT and P(3HT-b-3SFT)s were observed by the atomic force microscopy (AFM). Figure 4 shows AFM phase images of thin films of P3HT and P(3HT-b-3SFT). Roughness values for all polymers obtained from AFM images are summarized in Table 2. Similar roughness values for P3HT and P(3HT-b-3SFT)s were obtained, whereas the phase image of P(3HT-b-3SFT) was found to be quite different from that of P3HT. The phase image of the P3HT film shows a homogeneous surface, while the P(3HT-b-3SFT) film shows round-shape domains on the surface. These domains are apparently obtained due to the phase separation of the hydrocarbon and fluorinated carbon segments by the repulsive nature of the fluorine atom (Figure 5); and the difference of the domain size is caused by the molecular weight of the copolymer as well as the content of P3SFT in P(3HT-b-3SFT). These results suggest that even the small P3SFT segment of P(3HT-b-3SFT) is enough to influence the morphology of the polymer thin film.


Poly[(3-hexylthiophene)-block-(3-semifluoroalkylthiophene)] for polymer solar cells.

Yamada I, Takagi K, Hayashi Y, Soga T, Shibata N, Toru T - Int J Mol Sci (2010)

The model image of phase separation of P(3HT-b-3SFT).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3100822&req=5

f5-ijms-11-05027: The model image of phase separation of P(3HT-b-3SFT).
Mentions: The surface morphology of the thin film of P3HT and P(3HT-b-3SFT)s were observed by the atomic force microscopy (AFM). Figure 4 shows AFM phase images of thin films of P3HT and P(3HT-b-3SFT). Roughness values for all polymers obtained from AFM images are summarized in Table 2. Similar roughness values for P3HT and P(3HT-b-3SFT)s were obtained, whereas the phase image of P(3HT-b-3SFT) was found to be quite different from that of P3HT. The phase image of the P3HT film shows a homogeneous surface, while the P(3HT-b-3SFT) film shows round-shape domains on the surface. These domains are apparently obtained due to the phase separation of the hydrocarbon and fluorinated carbon segments by the repulsive nature of the fluorine atom (Figure 5); and the difference of the domain size is caused by the molecular weight of the copolymer as well as the content of P3SFT in P(3HT-b-3SFT). These results suggest that even the small P3SFT segment of P(3HT-b-3SFT) is enough to influence the morphology of the polymer thin film.

Bottom Line: 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/cm(2) (AM 1.5 solar illumination) in air.

View Article: PubMed Central - PubMed

Affiliation: Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan; E-Mails: jade1cat@yahoo.co.jp (I.Y.); soga@nitech.ac.jp (T.S.); nozshiba@nitech.ac.jp (N.S.).

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 (1)H and (19)F 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-C(61)-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/cm(2) (AM 1.5 solar illumination) in air.

Show MeSH
Related in: MedlinePlus