Synthesis and photovoltaic properties of a low band gap polymer for organic solar cell

Yong Ho Woo; Hyo Sang Lee; Sungnam Park; E. Joon Choi; Bong Soo Kim

doi:10.7317/pk.2015.39.1.71

Synthesis and photovoltaic properties of a low band gap polymer for organic solar cell

Yong Ho Woo, Hyo Sang Lee, Sungnam Park, E. Joon Choi, Bong Soo Kim

Department of Chemistry

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

2 Citations (Scopus)

Abstract

We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. difluorobenzothiadiazoles) for high performance organic solar cells. The polymer was prepared by the Stille coupling reaction and characterized using ¹H NMR, GPC, TGA, UV-visible absorption spectroscopy, and cyclic voltammetry. Solar cells were fabricated in a structure of ITO/PEDOT:PSS/polymer:PC₇₀BM/Al with five different blending ratios of polymer and PC₇₀BM (1:1.5, 1:2, 1:3, 1:3.5 and 1:4 by weight ratio). The best efficiency was achieved from the 1:3 ratio of polymer and PC₇₀BM in the photoactive layer, and TEM revealed that there is an optimal nanoscale phase separation between polymer and PC₇₀BM in the 1:3 ratio blend film.

Original language	English
Pages (from-to)	71-77
Number of pages	7
Journal	Polymer (Korea)
Volume	39
Issue number	1
DOIs	https://doi.org/10.7317/pk.2015.39.1.71
Publication status	Published - 2015 Jan 1

Keywords

Alternating copolymer
Low band gap
Organic solar cell
Stille coupling reaction

ASJC Scopus subject areas

Chemical Engineering(all)
Polymers and Plastics
Materials Chemistry

UN SDGs

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

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10.7317/pk.2015.39.1.71

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title = "Synthesis and photovoltaic properties of a low band gap polymer for organic solar cell",

abstract = "We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. difluorobenzothiadiazoles) for high performance organic solar cells. The polymer was prepared by the Stille coupling reaction and characterized using 1H NMR, GPC, TGA, UV-visible absorption spectroscopy, and cyclic voltammetry. Solar cells were fabricated in a structure of ITO/PEDOT:PSS/polymer:PC70BM/Al with five different blending ratios of polymer and PC70BM (1:1.5, 1:2, 1:3, 1:3.5 and 1:4 by weight ratio). The best efficiency was achieved from the 1:3 ratio of polymer and PC70BM in the photoactive layer, and TEM revealed that there is an optimal nanoscale phase separation between polymer and PC70BM in the 1:3 ratio blend film.",

keywords = "Alternating copolymer, Low band gap, Organic solar cell, Stille coupling reaction",

author = "Woo, {Yong Ho} and Lee, {Hyo Sang} and Sungnam Park and Choi, {E. Joon} and Kim, {Bong Soo}",

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doi = "10.7317/pk.2015.39.1.71",

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T1 - Synthesis and photovoltaic properties of a low band gap polymer for organic solar cell

AU - Woo, Yong Ho

AU - Lee, Hyo Sang

AU - Park, Sungnam

AU - Choi, E. Joon

AU - Kim, Bong Soo

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. difluorobenzothiadiazoles) for high performance organic solar cells. The polymer was prepared by the Stille coupling reaction and characterized using 1H NMR, GPC, TGA, UV-visible absorption spectroscopy, and cyclic voltammetry. Solar cells were fabricated in a structure of ITO/PEDOT:PSS/polymer:PC70BM/Al with five different blending ratios of polymer and PC70BM (1:1.5, 1:2, 1:3, 1:3.5 and 1:4 by weight ratio). The best efficiency was achieved from the 1:3 ratio of polymer and PC70BM in the photoactive layer, and TEM revealed that there is an optimal nanoscale phase separation between polymer and PC70BM in the 1:3 ratio blend film.

AB - We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. difluorobenzothiadiazoles) for high performance organic solar cells. The polymer was prepared by the Stille coupling reaction and characterized using 1H NMR, GPC, TGA, UV-visible absorption spectroscopy, and cyclic voltammetry. Solar cells were fabricated in a structure of ITO/PEDOT:PSS/polymer:PC70BM/Al with five different blending ratios of polymer and PC70BM (1:1.5, 1:2, 1:3, 1:3.5 and 1:4 by weight ratio). The best efficiency was achieved from the 1:3 ratio of polymer and PC70BM in the photoactive layer, and TEM revealed that there is an optimal nanoscale phase separation between polymer and PC70BM in the 1:3 ratio blend film.

KW - Alternating copolymer

KW - Low band gap

KW - Organic solar cell

KW - Stille coupling reaction

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DO - 10.7317/pk.2015.39.1.71

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VL - 39

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EP - 77

JO - Polymer (Korea)

JF - Polymer (Korea)

SN - 0379-153X

IS - 1

ER -

Synthesis and photovoltaic properties of a low band gap polymer for organic solar cell

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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