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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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J-V characteristics of polymer solar cells with PCBM:P(3HT-b-3SFT)s.
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f6-ijms-11-05027: J-V characteristics of polymer solar cells with PCBM:P(3HT-b-3SFT)s.

Mentions: The BHJ solar cells based on the blends of P(3HT-b-3SFT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were fabricated and the solar cell properties were characterized. The device structure was glass/ITO/PEDOT:PSS/blend of P(3HT-b-3SFT) and PCBM/Al. The property of solar cells was measured by using a solar simulator (100 mW/cm2, AM 1.5). We fabricated the solar cells with P(3HT-b-3SFT) (1 mol% and 2 mol% Ni(dppp)Cl2):PCBM (1:1 by weight) which were annealed at 100 °C for 20 min. Figure 6 shows the current density-voltage characteristics of the BHJ solar cells. The corresponding photovoltaic parameters (short circuit current density Jsc, open circuit voltage Voc, fill factor FF and solar cell efficiency Eff) are summarized in Table 3. The device with P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2) exhibits higher Jsc and FF values than that with P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2). On the other hand, the Voc value of the solar cell with P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2) was higher than that with P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2). The surface morphology of the solar cells by AFM was then studied. The phase image of P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2) has smaller domains (average domain area:0.006 μm) than the P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2) (average domain area:0.012 μm). This result is contrary to the AFM phase image of only P(3HT-b-3SFT) shown in Figure 5, and the solar cell which has smaller domain shows better solar cell performance. It seems that the blend of PCBM interrupts aggregation of diblock copolymers, as a result the domain size of copolymers for solar cells is smaller than those of copolymer thin films. However we cannot ascertain why the domain size of P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2) is smaller than that of P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2).


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)

J-V characteristics of polymer solar cells with PCBM:P(3HT-b-3SFT)s.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6-ijms-11-05027: J-V characteristics of polymer solar cells with PCBM:P(3HT-b-3SFT)s.
Mentions: The BHJ solar cells based on the blends of P(3HT-b-3SFT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were fabricated and the solar cell properties were characterized. The device structure was glass/ITO/PEDOT:PSS/blend of P(3HT-b-3SFT) and PCBM/Al. The property of solar cells was measured by using a solar simulator (100 mW/cm2, AM 1.5). We fabricated the solar cells with P(3HT-b-3SFT) (1 mol% and 2 mol% Ni(dppp)Cl2):PCBM (1:1 by weight) which were annealed at 100 °C for 20 min. Figure 6 shows the current density-voltage characteristics of the BHJ solar cells. The corresponding photovoltaic parameters (short circuit current density Jsc, open circuit voltage Voc, fill factor FF and solar cell efficiency Eff) are summarized in Table 3. The device with P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2) exhibits higher Jsc and FF values than that with P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2). On the other hand, the Voc value of the solar cell with P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2) was higher than that with P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2). The surface morphology of the solar cells by AFM was then studied. The phase image of P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2) has smaller domains (average domain area:0.006 μm) than the P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2) (average domain area:0.012 μm). This result is contrary to the AFM phase image of only P(3HT-b-3SFT) shown in Figure 5, and the solar cell which has smaller domain shows better solar cell performance. It seems that the blend of PCBM interrupts aggregation of diblock copolymers, as a result the domain size of copolymers for solar cells is smaller than those of copolymer thin films. However we cannot ascertain why the domain size of P(3HT-b-3SFT) (1 mol% Ni(dppp)Cl2) is smaller than that of P(3HT-b-3SFT) (2 mol% Ni(dppp)Cl2).

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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