Bulk-heterojunction organic photovoltaic cells fabricated using a high-viscosity solution of poly(3-hexylthiophene) with extremely high molecular weight

Yasuda, Takeshi; Meguro, Hikaru; Okamoto, Shuji; Han, Lyuan

doi:10.1038/pj.2012.182

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…Moreover, in all cases, atomic force microscopy (AFM) images of the spin-coated polymer thin films showed their flat surfaces (Figure S2). Although both the terminal moiety and molecular weight − are known to affect the surface morphology of the crystalline polymers, P1 – P4 have similar surface morphologies, presumably due to the characteristics of the amorphous polymers. These results show that both the energy levels and morphologies were independent of the modification of the terminal structure, the amount of residual Pd, and the molecular weights of the polymers.…”

Section: Resultsmentioning

confidence: 99%

“…Of the several potential factors, we focused on the polymer terminal structure, residual Pd catalyst, and the molecular weight of polymers, and we systematically investigated the effects of these factors on OPV performance. Although the terminal structure, − amount of residual Pd, − and molecular weight − are known to affect the performance of OPVs, a systematic comparison of these factors on material performance has not been made . In addition, the dependence of the long-term stability of the materials on these three factors and the use of environmentally friendly fabrication methods using a nonhalogenated solvent are also discussed.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Terminal Structure, Purity, and Molecular Weight of an Amorphous Conjugated Polymer on Its Photovoltaic Characteristics

Kuwabara

Yasuda

Takase

et al. 2016

ACS Appl. Mater. Interfaces

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The photovoltaic characteristics of an amorphous polymer containing EDOT and fluorene units were investigated. In particular, the effects of the terminal structure, residual amount of Pd, and molecular weight were systematically investigated. Direct arylation polycondensation of EDOT followed by an established purification method readily afforded polymers with different terminal structures, Pd contents, and molecular weights. Of these factors, the terminal structure of the polymer was a crucial factor affecting the photovoltaic characteristics. For example, the polymer with a Br terminal had a PCE of 2.9% in bulk-heterojunction organic photovoltaics (BHJ OPVs) with a fullerene derivative, whereas the polymer without a Br terminal had a PCE of 4.6% in the same cell configuration. The decreased Pd residues and high molecular weights of the polymers increased the long-term stability of the devices. Moreover, BHJ OPVs containing the high-molecular-weight polymer could be fabricated with an environmentally friendly nonhalogenated solvent.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the Terminal Structure, Purity, and Molecular Weight of an Amorphous Conjugated Polymer on Its Photovoltaic Characteristics

Kuwabara

Yasuda

Takase

et al. 2016

ACS Appl. Mater. Interfaces

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“…Although the PCEs of poly(3HTBT-TPA)-based OPVs fabricated using non-halogenated solvents were lower than those of P3HT-based OPVs fabricated using the typical halogenated solvent o-DCB [18,19], the use of amorphous polymers in BHJ OPVs offers two advantages over the use of polycrystalline polymers films: highly reproducible BHJ OPV performance and the possibility of an environmentally friendly process for fabricating BHJ OPVs.…”

Section: Resultsmentioning

confidence: 99%

Bulk Heterojunction Photovoltaic Cells with Triphenylamine-Based Amorphous Polymer and Non-Halogenated Solvent Processing Provide Reproducible Performance

Yasuda

Kusagaki

Kitahara

et al. 2015

J. Photopol. Sci. Technol.

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The performance of bulk heterojunction (BHJ) organic photovoltaics (OPVs) based on an amorphous polymer, poly(3HTBT-TPA), and fabricated using either halogenated or non-halogenated solvents was investigated. All the BHJ OPVs exhibited almost the same power conversion efficiencies of around 2.2%, indicating that their performance is independent of the casting solvent. These experimental results indicate that the use of amorphous π-conjugated polymers in the fabrication of BHJ OPVs offers two advantages over the use of polycrystalline π-conjugated polymers: highly reproducible OPV performance and the possibility of an environmentally friendly process for fabricating OPVs.

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“…High molecular weight: A synthetic method should afford a high-molecular-weight polymer, which generally show better performances regarding carrier mobility and photoelectric conversion. [14][15][16][17] To achieve a high molecular weight, the conversion of the coupling reaction must be high.…”

Section: Introductionmentioning

confidence: 99%

Direct arylation polycondensation for synthesis of optoelectronic materials

Kuwabara

2018

Polym J

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Direct arylation polycondensation has been investigated to develop efficient methods for the preparation of conjugated polymer materials for optoelectronic applications. The reaction conditions have been examined to achieve a high molecular weight and minimal structural defects in the recurring structure. Under the optimal conditions, the direct arylation method has several advantages over the conventional method, for example, having few synthetic steps and yielding a high-molecular-weight and high-purity polymer. The obtained high-quality polymer materials show superior performance to those obtained using a conventional method when used in optoelectronic devices such as organic photovoltaics and field effect transistors. Recent developments in C-H/C-H coupling polycondensation are also described.

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Bulk-heterojunction organic photovoltaic cells fabricated using a high-viscosity solution of poly(3-hexylthiophene) with extremely high molecular weight

Cited by 8 publications

References 19 publications

Effects of the Terminal Structure, Purity, and Molecular Weight of an Amorphous Conjugated Polymer on Its Photovoltaic Characteristics

Effects of the Terminal Structure, Purity, and Molecular Weight of an Amorphous Conjugated Polymer on Its Photovoltaic Characteristics

Bulk Heterojunction Photovoltaic Cells with Triphenylamine-Based Amorphous Polymer and Non-Halogenated Solvent Processing Provide Reproducible Performance

Direct arylation polycondensation for synthesis of optoelectronic materials

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