Drastic change of molecular orientation in a thiazolothiazole copolymer by molecular-weight control and blending with PC 61BM leads to high efficiencies in solar cells

Itaru Osaka; Masahiko Saito; Hiroki Mori; Tomoyuki Koganezawa; Kazuo Takimiya

doi:10.1002/adma.201103065

Drastic change of molecular orientation in a thiazolothiazole copolymer by molecular-weight control and blending with PC ₆₁BM leads to high efficiencies in solar cells

Itaru Osaka, Masahiko Saito, Hiroki Mori, Tomoyuki Koganezawa, Kazuo Takimiya

Research output: Contribution to journal › Article › peer-review

156 Citations (Scopus)

Abstract

A thiazolothiazole-thiophene copolymer is examined as the active material in bulk heterojunction (BHJ) solar cells. By optimizing the molecular weight, the polymer-based cells exhibit power conversion efficiencies as high as 5.7%. The increase in molecular weight improves the orientational order, and blending with phenyl-C61-butyric acid methyl ester (PC ₆₁BM) changes the orientational motif from edge-on to face-on, which accounts for the trend in photovoltaic performances. These results might give new insight into the structure-property relationships in BHJ solar cells.

Original language	English
Pages (from-to)	425-430
Number of pages	6
Journal	Advanced Materials
Volume	24
Issue number	3
DOIs	https://doi.org/10.1002/adma.201103065
Publication status	Published - Jan 17 2012
Externally published	Yes

Keywords

bulk heterojunctions
molecular orientation
semiconducting polymers
solar cells
thiazolothiazole

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/adma.201103065

Cite this

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abstract = "A thiazolothiazole-thiophene copolymer is examined as the active material in bulk heterojunction (BHJ) solar cells. By optimizing the molecular weight, the polymer-based cells exhibit power conversion efficiencies as high as 5.7%. The increase in molecular weight improves the orientational order, and blending with phenyl-C61-butyric acid methyl ester (PC 61BM) changes the orientational motif from edge-on to face-on, which accounts for the trend in photovoltaic performances. These results might give new insight into the structure-property relationships in BHJ solar cells.",

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T1 - Drastic change of molecular orientation in a thiazolothiazole copolymer by molecular-weight control and blending with PC 61BM leads to high efficiencies in solar cells

AU - Osaka, Itaru

AU - Saito, Masahiko

AU - Mori, Hiroki

AU - Koganezawa, Tomoyuki

AU - Takimiya, Kazuo

PY - 2012/1/17

Y1 - 2012/1/17

N2 - A thiazolothiazole-thiophene copolymer is examined as the active material in bulk heterojunction (BHJ) solar cells. By optimizing the molecular weight, the polymer-based cells exhibit power conversion efficiencies as high as 5.7%. The increase in molecular weight improves the orientational order, and blending with phenyl-C61-butyric acid methyl ester (PC 61BM) changes the orientational motif from edge-on to face-on, which accounts for the trend in photovoltaic performances. These results might give new insight into the structure-property relationships in BHJ solar cells.

AB - A thiazolothiazole-thiophene copolymer is examined as the active material in bulk heterojunction (BHJ) solar cells. By optimizing the molecular weight, the polymer-based cells exhibit power conversion efficiencies as high as 5.7%. The increase in molecular weight improves the orientational order, and blending with phenyl-C61-butyric acid methyl ester (PC 61BM) changes the orientational motif from edge-on to face-on, which accounts for the trend in photovoltaic performances. These results might give new insight into the structure-property relationships in BHJ solar cells.

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KW - solar cells

KW - thiazolothiazole

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