A benzothiadiazole-based oligothiophene for vacuum-deposited organic photovoltaic cells

Jin Ah Kong; Eunhee Lim; Kyeong K. Lee; Sungkoo Lee; Sung Hyun Kim

doi:10.1016/j.solmat.2010.06.016

A benzothiadiazole-based oligothiophene for vacuum-deposited organic photovoltaic cells

Jin Ah Kong, Eunhee Lim, Kyeong K. Lee, Sungkoo Lee, Sung Hyun Kim

Department of Applied Chemistry

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

40 Scopus citations

Abstract

We introduced a benzothiadiazole unit into a small molecule conjugated system and determined the electronic features and organic photovoltaic cell (OPV) characteristics of the resulting material, 4,7-bis(5′-hexyl-2, 2′-bithiophene-5-yl)benzothiadiazole (DH5TB). DH5TB showed remarkably red-shifted UVvis absorption and photoluminescence (PL) emission spectra compared with α,α′-dihexyl-quinquethiophene (DH5T). The low energy band gap of 1.95 eV and good film morphology of DH5TB resulted in good OPV performance. We investigated the DH5TB:C₆₀ blend ratio dependence on OPV performance and further improved the efficiency by introducing a C ₆₀ interlayer on top of the DH5TB:C₆₀ layer. In the present work, the best photovoltaic cells had a J_SC of 4.75 mA/cm², a V_OC of 0.53 V, and a fill factor (FF) of 0.38, giving a power conversion efficiency of 0.97% under AM 1.5 (100 m/cm ²) without thermal annealing.

Original language	English
Pages (from-to)	2057-2063
Number of pages	7
Journal	Solar Energy Materials and Solar Cells
Volume	94
Issue number	12
DOIs	https://doi.org/10.1016/j.solmat.2010.06.016
State	Published - Dec 2010

Keywords

Benzothiadiazole
Low band gap
Oligothiophene
Organic photovoltaic cells
Solar cells

UN SDGs

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

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10.1016/j.solmat.2010.06.016

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title = "A benzothiadiazole-based oligothiophene for vacuum-deposited organic photovoltaic cells",

abstract = "We introduced a benzothiadiazole unit into a small molecule conjugated system and determined the electronic features and organic photovoltaic cell (OPV) characteristics of the resulting material, 4,7-bis(5′-hexyl-2, 2′-bithiophene-5-yl)benzothiadiazole (DH5TB). DH5TB showed remarkably red-shifted UVvis absorption and photoluminescence (PL) emission spectra compared with α,α′-dihexyl-quinquethiophene (DH5T). The low energy band gap of 1.95 eV and good film morphology of DH5TB resulted in good OPV performance. We investigated the DH5TB:C60 blend ratio dependence on OPV performance and further improved the efficiency by introducing a C 60 interlayer on top of the DH5TB:C60 layer. In the present work, the best photovoltaic cells had a JSC of 4.75 mA/cm2, a VOC of 0.53 V, and a fill factor (FF) of 0.38, giving a power conversion efficiency of 0.97% under AM 1.5 (100 m/cm 2) without thermal annealing.",

keywords = "Benzothiadiazole, Low band gap, Oligothiophene, Organic photovoltaic cells, Solar cells",

author = "{Ah Kong}, Jin and Eunhee Lim and Lee, {Kyeong K.} and Sungkoo Lee and {Hyun Kim}, Sung",

year = "2010",

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doi = "10.1016/j.solmat.2010.06.016",

language = "English",

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T1 - A benzothiadiazole-based oligothiophene for vacuum-deposited organic photovoltaic cells

AU - Ah Kong, Jin

AU - Lim, Eunhee

AU - Lee, Kyeong K.

AU - Lee, Sungkoo

AU - Hyun Kim, Sung

PY - 2010/12

Y1 - 2010/12

N2 - We introduced a benzothiadiazole unit into a small molecule conjugated system and determined the electronic features and organic photovoltaic cell (OPV) characteristics of the resulting material, 4,7-bis(5′-hexyl-2, 2′-bithiophene-5-yl)benzothiadiazole (DH5TB). DH5TB showed remarkably red-shifted UVvis absorption and photoluminescence (PL) emission spectra compared with α,α′-dihexyl-quinquethiophene (DH5T). The low energy band gap of 1.95 eV and good film morphology of DH5TB resulted in good OPV performance. We investigated the DH5TB:C60 blend ratio dependence on OPV performance and further improved the efficiency by introducing a C 60 interlayer on top of the DH5TB:C60 layer. In the present work, the best photovoltaic cells had a JSC of 4.75 mA/cm2, a VOC of 0.53 V, and a fill factor (FF) of 0.38, giving a power conversion efficiency of 0.97% under AM 1.5 (100 m/cm 2) without thermal annealing.

AB - We introduced a benzothiadiazole unit into a small molecule conjugated system and determined the electronic features and organic photovoltaic cell (OPV) characteristics of the resulting material, 4,7-bis(5′-hexyl-2, 2′-bithiophene-5-yl)benzothiadiazole (DH5TB). DH5TB showed remarkably red-shifted UVvis absorption and photoluminescence (PL) emission spectra compared with α,α′-dihexyl-quinquethiophene (DH5T). The low energy band gap of 1.95 eV and good film morphology of DH5TB resulted in good OPV performance. We investigated the DH5TB:C60 blend ratio dependence on OPV performance and further improved the efficiency by introducing a C 60 interlayer on top of the DH5TB:C60 layer. In the present work, the best photovoltaic cells had a JSC of 4.75 mA/cm2, a VOC of 0.53 V, and a fill factor (FF) of 0.38, giving a power conversion efficiency of 0.97% under AM 1.5 (100 m/cm 2) without thermal annealing.

KW - Benzothiadiazole

KW - Low band gap

KW - Oligothiophene

KW - Organic photovoltaic cells

KW - Solar cells

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M3 - Article

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SN - 0927-0248

VL - 94

SP - 2057

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JO - Solar Energy Materials and Solar Cells

JF - Solar Energy Materials and Solar Cells

IS - 12

ER -

A benzothiadiazole-based oligothiophene for vacuum-deposited organic photovoltaic cells

Abstract

Keywords

UN SDGs

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