Asymmetrically Alkyl-Substituted Wide-Bandgap Nonfullerene Acceptor for Organic Solar Cells

Tian Xia; Chao Li; Hwa Sook Ryu; Xiaobo Sun; Han Young Woo; Yanming Sun

doi:10.1002/solr.202000061

Asymmetrically Alkyl-Substituted Wide-Bandgap Nonfullerene Acceptor for Organic Solar Cells

Tian Xia, Chao Li, Hwa Sook Ryu, Xiaobo Sun, Han Young Woo, Yanming Sun

Department of Chemistry

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

11 Citations (Scopus)

Abstract

An asymmetric wide-bandgap (WBG) nonfullerene acceptor (C₆-IDTT-T) is developed by shearing one alkyl side-chain from a symmetrically alkyl-substituted indacenodithieno[3,2-b]thiophene (IDTT) core of the fused-ring electron acceptor 2C₆-IDTT-T. These two acceptors both exhibit wide optical bandgaps over 1.8 eV. Investigations on the optical, electrochemical, and active layer morphology are conducted to understand the effect of asymmetric side chains on the electrical and photovoltaic properties. Compared with symmetric 2C₆-IDTT-T, asymmetric C₆-IDTT-T is found to exhibit redshifted absorption and higher electron mobility. As a result, the C₆-IDTT-T blend with a thienothiophene-benzodithiophene copolymer (PTB7-Th) presents higher electron mobility and more balanced charge carrier transport, which leads to an enhanced power conversion efficiency of 8.51% for C₆-IDTT-T-based device with a high open-circuit voltage of 1.052 V and a low energy loss of 0.60 eV.

Original language	English
Article number	2000061
Journal	Solar RRL
Volume	4
Issue number	5
DOIs	https://doi.org/10.1002/solr.202000061
Publication status	Published - 2020 May 1

Keywords

alkyl tailoring strategy
asymmetric nonfullerene acceptors
efficiency
open-circuit voltages
wide bandgaps

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Energy Engineering and Power Technology
Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

UN SDGs

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

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10.1002/solr.202000061

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title = "Asymmetrically Alkyl-Substituted Wide-Bandgap Nonfullerene Acceptor for Organic Solar Cells",

abstract = "An asymmetric wide-bandgap (WBG) nonfullerene acceptor (C6-IDTT-T) is developed by shearing one alkyl side-chain from a symmetrically alkyl-substituted indacenodithieno[3,2-b]thiophene (IDTT) core of the fused-ring electron acceptor 2C6-IDTT-T. These two acceptors both exhibit wide optical bandgaps over 1.8 eV. Investigations on the optical, electrochemical, and active layer morphology are conducted to understand the effect of asymmetric side chains on the electrical and photovoltaic properties. Compared with symmetric 2C6-IDTT-T, asymmetric C6-IDTT-T is found to exhibit redshifted absorption and higher electron mobility. As a result, the C6-IDTT-T blend with a thienothiophene-benzodithiophene copolymer (PTB7-Th) presents higher electron mobility and more balanced charge carrier transport, which leads to an enhanced power conversion efficiency of 8.51% for C6-IDTT-T-based device with a high open-circuit voltage of 1.052 V and a low energy loss of 0.60 eV.",

keywords = "alkyl tailoring strategy, asymmetric nonfullerene acceptors, efficiency, open-circuit voltages, wide bandgaps",

author = "Tian Xia and Chao Li and Ryu, {Hwa Sook} and Xiaobo Sun and Woo, {Han Young} and Yanming Sun",

note = "Funding Information: This work was financially supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 21734001, 51825301, and 21674007). H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2016M1A2A2940911, 2019R1A6A1A11044070). Publisher Copyright: {\textcopyright} 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2020",

month = may,

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doi = "10.1002/solr.202000061",

language = "English",

volume = "4",

journal = "Solar RRL",

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T1 - Asymmetrically Alkyl-Substituted Wide-Bandgap Nonfullerene Acceptor for Organic Solar Cells

AU - Xia, Tian

AU - Li, Chao

AU - Ryu, Hwa Sook

AU - Sun, Xiaobo

AU - Woo, Han Young

AU - Sun, Yanming

N1 - Funding Information: This work was financially supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 21734001, 51825301, and 21674007). H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2016M1A2A2940911, 2019R1A6A1A11044070). Publisher Copyright: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2020/5/1

Y1 - 2020/5/1

N2 - An asymmetric wide-bandgap (WBG) nonfullerene acceptor (C6-IDTT-T) is developed by shearing one alkyl side-chain from a symmetrically alkyl-substituted indacenodithieno[3,2-b]thiophene (IDTT) core of the fused-ring electron acceptor 2C6-IDTT-T. These two acceptors both exhibit wide optical bandgaps over 1.8 eV. Investigations on the optical, electrochemical, and active layer morphology are conducted to understand the effect of asymmetric side chains on the electrical and photovoltaic properties. Compared with symmetric 2C6-IDTT-T, asymmetric C6-IDTT-T is found to exhibit redshifted absorption and higher electron mobility. As a result, the C6-IDTT-T blend with a thienothiophene-benzodithiophene copolymer (PTB7-Th) presents higher electron mobility and more balanced charge carrier transport, which leads to an enhanced power conversion efficiency of 8.51% for C6-IDTT-T-based device with a high open-circuit voltage of 1.052 V and a low energy loss of 0.60 eV.

AB - An asymmetric wide-bandgap (WBG) nonfullerene acceptor (C6-IDTT-T) is developed by shearing one alkyl side-chain from a symmetrically alkyl-substituted indacenodithieno[3,2-b]thiophene (IDTT) core of the fused-ring electron acceptor 2C6-IDTT-T. These two acceptors both exhibit wide optical bandgaps over 1.8 eV. Investigations on the optical, electrochemical, and active layer morphology are conducted to understand the effect of asymmetric side chains on the electrical and photovoltaic properties. Compared with symmetric 2C6-IDTT-T, asymmetric C6-IDTT-T is found to exhibit redshifted absorption and higher electron mobility. As a result, the C6-IDTT-T blend with a thienothiophene-benzodithiophene copolymer (PTB7-Th) presents higher electron mobility and more balanced charge carrier transport, which leads to an enhanced power conversion efficiency of 8.51% for C6-IDTT-T-based device with a high open-circuit voltage of 1.052 V and a low energy loss of 0.60 eV.

KW - alkyl tailoring strategy

KW - asymmetric nonfullerene acceptors

KW - efficiency

KW - open-circuit voltages

KW - wide bandgaps

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AN - SCOPUS:85084916445

SN - 2367-198X

VL - 4

JO - Solar RRL

JF - Solar RRL

IS - 5

M1 - 2000061

ER -

Asymmetrically Alkyl-Substituted Wide-Bandgap Nonfullerene Acceptor for Organic Solar Cells

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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