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

Honorary professors

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

38 Citations (Scopus)

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
Publication status	Published - 2010 Dec

Keywords

Benzothiadiazole
Low band gap
Oligothiophene
Organic photovoltaic cells
Solar cells

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films

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@article{d412cf92746849babd240af4f536944f,

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",

month = dec,

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

language = "English",

volume = "94",

pages = "2057--2063",

journal = "Solar Energy Materials and Solar Cells",

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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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