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

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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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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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