Effect of fluorine substitution on photovoltaic performance of DPP-based copolymer

Jin Yong Lee; Jea Woong Jo; Won Ho Jo

doi:10.1016/j.orgel.2015.02.008

Effect of fluorine substitution on photovoltaic performance of DPP-based copolymer

Jin Yong Lee
, Jea Woong Jo
, Won Ho Jo

Department of Energy and Materials Engineering

Seoul National University

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

14 Scopus citations

Abstract

Low bandgap conjugated copolymers composed of thiophene-capped diketopyrrolopyrrole and benzene with/without fluorination were synthesized to investigate the effect of fluorine substitution on their photovoltaic properties. With increasing the number of substituted fluorine atom on benzene, both HOMO and LUMO energy levels of the copolymer are lowered and its crystallinity is increased. The fibril size of copolymer:PC₇₁BM blend becomes smaller as the number of substituted fluorine increases. As a result, the copolymer with two fluorine substitution exhibits deeper HOMO energy level (-5.30 eV), leading to higher V_OC (0.72 V), and also enhanced crystallinity (polymer chain packing), leading to higher J_SC (12.4 mA cm^-2) as compared to mono- and non-fluorinated ones. The copolymer with two fluorine atoms shows a promising power conversion efficiency of 5.63%.

Original language	English
Pages (from-to)	125-131
Number of pages	7
Journal	Organic Electronics
Volume	20
DOIs	https://doi.org/10.1016/j.orgel.2015.02.008
State	Published - May 2015

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

Conjugated polymer
Diketopyrrolopyrrole
Fluorination
Polymer solar cell

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10.1016/j.orgel.2015.02.008

Cite this

@article{97e5ec8d231e406d9ba77ea2d243959c,

title = "Effect of fluorine substitution on photovoltaic performance of DPP-based copolymer",

abstract = "Low bandgap conjugated copolymers composed of thiophene-capped diketopyrrolopyrrole and benzene with/without fluorination were synthesized to investigate the effect of fluorine substitution on their photovoltaic properties. With increasing the number of substituted fluorine atom on benzene, both HOMO and LUMO energy levels of the copolymer are lowered and its crystallinity is increased. The fibril size of copolymer:PC71BM blend becomes smaller as the number of substituted fluorine increases. As a result, the copolymer with two fluorine substitution exhibits deeper HOMO energy level (-5.30 eV), leading to higher VOC (0.72 V), and also enhanced crystallinity (polymer chain packing), leading to higher JSC (12.4 mA cm-2) as compared to mono- and non-fluorinated ones. The copolymer with two fluorine atoms shows a promising power conversion efficiency of 5.63\%.",

keywords = "Conjugated polymer, Diketopyrrolopyrrole, Fluorination, Polymer solar cell",

author = "Lee, \{Jin Yong\} and Jo, \{Jea Woong\} and Jo, \{Won Ho\}",

note = "Publisher Copyright: {\textcopyright}, 2015 Published by Elsevier B.V.",

year = "2015",

month = may,

doi = "10.1016/j.orgel.2015.02.008",

language = "English",

volume = "20",

pages = "125--131",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Effect of fluorine substitution on photovoltaic performance of DPP-based copolymer

AU - Lee, Jin Yong

AU - Jo, Jea Woong

AU - Jo, Won Ho

N1 - Publisher Copyright: ©, 2015 Published by Elsevier B.V.

PY - 2015/5

Y1 - 2015/5

N2 - Low bandgap conjugated copolymers composed of thiophene-capped diketopyrrolopyrrole and benzene with/without fluorination were synthesized to investigate the effect of fluorine substitution on their photovoltaic properties. With increasing the number of substituted fluorine atom on benzene, both HOMO and LUMO energy levels of the copolymer are lowered and its crystallinity is increased. The fibril size of copolymer:PC71BM blend becomes smaller as the number of substituted fluorine increases. As a result, the copolymer with two fluorine substitution exhibits deeper HOMO energy level (-5.30 eV), leading to higher VOC (0.72 V), and also enhanced crystallinity (polymer chain packing), leading to higher JSC (12.4 mA cm-2) as compared to mono- and non-fluorinated ones. The copolymer with two fluorine atoms shows a promising power conversion efficiency of 5.63%.

AB - Low bandgap conjugated copolymers composed of thiophene-capped diketopyrrolopyrrole and benzene with/without fluorination were synthesized to investigate the effect of fluorine substitution on their photovoltaic properties. With increasing the number of substituted fluorine atom on benzene, both HOMO and LUMO energy levels of the copolymer are lowered and its crystallinity is increased. The fibril size of copolymer:PC71BM blend becomes smaller as the number of substituted fluorine increases. As a result, the copolymer with two fluorine substitution exhibits deeper HOMO energy level (-5.30 eV), leading to higher VOC (0.72 V), and also enhanced crystallinity (polymer chain packing), leading to higher JSC (12.4 mA cm-2) as compared to mono- and non-fluorinated ones. The copolymer with two fluorine atoms shows a promising power conversion efficiency of 5.63%.

KW - Conjugated polymer

KW - Diketopyrrolopyrrole

KW - Fluorination

KW - Polymer solar cell

UR - https://www.scopus.com/pages/publications/84923551937

U2 - 10.1016/j.orgel.2015.02.008

DO - 10.1016/j.orgel.2015.02.008

M3 - Article

AN - SCOPUS:84923551937

SN - 1566-1199

VL - 20

SP - 125

EP - 131

JO - Organic Electronics

JF - Organic Electronics

ER -

Effect of fluorine substitution on photovoltaic performance of DPP-based copolymer

Abstract

UN SDGs

Keywords

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