Comparative study of fluorene- and carbazole-based polymer donors for organic photovoltaic cells

Yoonho Eom; Eunhee Lim

doi:10.7317/pk.2015.39.6.986

Comparative study of fluorene- and carbazole-based polymer donors for organic photovoltaic cells

Yoonho Eom, Eunhee Lim

Department of Applied Chemistry

Kyonggi University

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

1 Scopus citations

Abstract

We synthesized two triazole-substituted fluorene- and carbazole-based copolymers PFT2Tz and PCzT2Tz by Suzuki-coupling reaction and characterized them with 'H NMR. The physical properties of the copolymers were investigated with GPC, TGA, CV, and UV-vis absorption spectroscopy. The HOMO energy levels of PFT2Tz and PCzT2Tz were -5.37 and -5.32 eV, respectively. More importantly, PCzT2Tz film had a broader, red-shifted UV absorption than the PFT2Tz. The organic photovoltaic cells were fabricated with a configuration of ITO/PEDOT:PSS/copolymer: PC₇₁|BM/LiF/Al using the copolymers as donors. PCzT2Tz showed the higher power conversion efficiency (PCE) of 0.67% (J_sc= 2.79 mA/cm², V_oc = 0.68 V), compared to PFT2Tz (PCE = 0.57%, J_sc = 2.16 mA/cm², V_oc = 0.83 V). The relatively high open-circuit voltage of the PCzT2Tz came from the low-lying HOMO level of the PCzT2Tz donor. The higher PCE of PCzT2Tz can be explained by its relatively improved UV absorption and thus higher short-circuit currents.

Original language	English
Pages (from-to)	986-992
Number of pages	7
Journal	Polymer (Korea)
Volume	39
Issue number	6
DOIs	https://doi.org/10.7317/pk.2015.39.6.986
State	Published - Nov 2015

Keywords

Carbazole
Conjugated polymer
Fluorene
Organic solar cells (OPV)

UN SDGs

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

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title = "Comparative study of fluorene- and carbazole-based polymer donors for organic photovoltaic cells",

abstract = "We synthesized two triazole-substituted fluorene- and carbazole-based copolymers PFT2Tz and PCzT2Tz by Suzuki-coupling reaction and characterized them with 'H NMR. The physical properties of the copolymers were investigated with GPC, TGA, CV, and UV-vis absorption spectroscopy. The HOMO energy levels of PFT2Tz and PCzT2Tz were -5.37 and -5.32 eV, respectively. More importantly, PCzT2Tz film had a broader, red-shifted UV absorption than the PFT2Tz. The organic photovoltaic cells were fabricated with a configuration of ITO/PEDOT:PSS/copolymer: PC71|BM/LiF/Al using the copolymers as donors. PCzT2Tz showed the higher power conversion efficiency (PCE) of 0.67% (Jsc= 2.79 mA/cm2, Voc = 0.68 V), compared to PFT2Tz (PCE = 0.57%, Jsc = 2.16 mA/cm2, Voc = 0.83 V). The relatively high open-circuit voltage of the PCzT2Tz came from the low-lying HOMO level of the PCzT2Tz donor. The higher PCE of PCzT2Tz can be explained by its relatively improved UV absorption and thus higher short-circuit currents.",

keywords = "Carbazole, Conjugated polymer, Fluorene, Organic solar cells (OPV)",

author = "Yoonho Eom and Eunhee Lim",

year = "2015",

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doi = "10.7317/pk.2015.39.6.986",

language = "English",

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pages = "986--992",

journal = "Polymer (Korea)",

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publisher = "Polymer Society of Korea",

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TY - JOUR

T1 - Comparative study of fluorene- and carbazole-based polymer donors for organic photovoltaic cells

AU - Eom, Yoonho

AU - Lim, Eunhee

PY - 2015/11

Y1 - 2015/11

N2 - We synthesized two triazole-substituted fluorene- and carbazole-based copolymers PFT2Tz and PCzT2Tz by Suzuki-coupling reaction and characterized them with 'H NMR. The physical properties of the copolymers were investigated with GPC, TGA, CV, and UV-vis absorption spectroscopy. The HOMO energy levels of PFT2Tz and PCzT2Tz were -5.37 and -5.32 eV, respectively. More importantly, PCzT2Tz film had a broader, red-shifted UV absorption than the PFT2Tz. The organic photovoltaic cells were fabricated with a configuration of ITO/PEDOT:PSS/copolymer: PC71|BM/LiF/Al using the copolymers as donors. PCzT2Tz showed the higher power conversion efficiency (PCE) of 0.67% (Jsc= 2.79 mA/cm2, Voc = 0.68 V), compared to PFT2Tz (PCE = 0.57%, Jsc = 2.16 mA/cm2, Voc = 0.83 V). The relatively high open-circuit voltage of the PCzT2Tz came from the low-lying HOMO level of the PCzT2Tz donor. The higher PCE of PCzT2Tz can be explained by its relatively improved UV absorption and thus higher short-circuit currents.

AB - We synthesized two triazole-substituted fluorene- and carbazole-based copolymers PFT2Tz and PCzT2Tz by Suzuki-coupling reaction and characterized them with 'H NMR. The physical properties of the copolymers were investigated with GPC, TGA, CV, and UV-vis absorption spectroscopy. The HOMO energy levels of PFT2Tz and PCzT2Tz were -5.37 and -5.32 eV, respectively. More importantly, PCzT2Tz film had a broader, red-shifted UV absorption than the PFT2Tz. The organic photovoltaic cells were fabricated with a configuration of ITO/PEDOT:PSS/copolymer: PC71|BM/LiF/Al using the copolymers as donors. PCzT2Tz showed the higher power conversion efficiency (PCE) of 0.67% (Jsc= 2.79 mA/cm2, Voc = 0.68 V), compared to PFT2Tz (PCE = 0.57%, Jsc = 2.16 mA/cm2, Voc = 0.83 V). The relatively high open-circuit voltage of the PCzT2Tz came from the low-lying HOMO level of the PCzT2Tz donor. The higher PCE of PCzT2Tz can be explained by its relatively improved UV absorption and thus higher short-circuit currents.

KW - Carbazole

KW - Conjugated polymer

KW - Fluorene

KW - Organic solar cells (OPV)

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SN - 0379-153X

VL - 39

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JO - Polymer (Korea)

JF - Polymer (Korea)

IS - 6

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Comparative study of fluorene- and carbazole-based polymer donors for organic photovoltaic cells

Abstract

Keywords

UN SDGs

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