Efficient Exciton Diffusion in Organic Bilayer Heterojunctions with Nonfullerene Small Molecular Acceptors

Tack Ho Lee; Song Yi Park; Won Woo Park; Xiaoyan Du; Jae Hoon Son; Ning Li; Oh Hoon Kwon; Han Young Woo; Christoph J. Brabec; Jin Young Kim

doi:10.1021/acsenergylett.0c00564

Efficient Exciton Diffusion in Organic Bilayer Heterojunctions with Nonfullerene Small Molecular Acceptors

Tack Ho Lee, Song Yi Park, Won Woo Park, Xiaoyan Du, Jae Hoon Son, Ning Li, Oh Hoon Kwon, Han Young Woo, Christoph J. Brabec, Jin Young Kim

Department of Chemistry

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

31 Citations (Scopus)

Abstract

Solution-processed bilayer organic solar cells (OSCs) with high performance are demonstrated for nonfullerene small molecular acceptors (NFAs). Unlike fullerene acceptors, NFAs show significant spectral overlap between their absorption and the photoluminescence (PL) of a polymer donor, which makes the design of an efficient exciton-harvesting bilayer heterojunction possible. Efficient exciton diffusion in the organic bilayer heterojunction is realized by long-range energy transfer between a polymer donor and NFAs. We observed efficient exciton diffusion from the polymer/NFA bilayer heterojunctions via thickness-dependent PL quenching and time-resolved PL measurements. Despite the strongly reduced donor-acceptor interface area, a substantial density of charge-transfer states is observed for the polymer/NFA bilayer heterojunctions by electroluminescence measurements. Overall, polymer/NFA bilayer heterojunction OSCs demonstrate a power conversion efficiency of 9%-10%, which is comparable to the photovoltaic performance of bulk heterojunction OSCs, with the additional advantage of simplified microstructure formation.

Original language	English
Pages (from-to)	1628-1635
Number of pages	8
Journal	ACS Energy Letters
Volume	5
Issue number	5
DOIs	https://doi.org/10.1021/acsenergylett.0c00564
Publication status	Published - 2020 May 8

ASJC Scopus subject areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

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10.1021/acsenergylett.0c00564

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@article{1898cc39656c400c96bbf5c8ea19e352,

title = "Efficient Exciton Diffusion in Organic Bilayer Heterojunctions with Nonfullerene Small Molecular Acceptors",

abstract = "Solution-processed bilayer organic solar cells (OSCs) with high performance are demonstrated for nonfullerene small molecular acceptors (NFAs). Unlike fullerene acceptors, NFAs show significant spectral overlap between their absorption and the photoluminescence (PL) of a polymer donor, which makes the design of an efficient exciton-harvesting bilayer heterojunction possible. Efficient exciton diffusion in the organic bilayer heterojunction is realized by long-range energy transfer between a polymer donor and NFAs. We observed efficient exciton diffusion from the polymer/NFA bilayer heterojunctions via thickness-dependent PL quenching and time-resolved PL measurements. Despite the strongly reduced donor-acceptor interface area, a substantial density of charge-transfer states is observed for the polymer/NFA bilayer heterojunctions by electroluminescence measurements. Overall, polymer/NFA bilayer heterojunction OSCs demonstrate a power conversion efficiency of 9%-10%, which is comparable to the photovoltaic performance of bulk heterojunction OSCs, with the additional advantage of simplified microstructure formation. ",

author = "Lee, {Tack Ho} and Park, {Song Yi} and Park, {Won Woo} and Xiaoyan Du and Son, {Jae Hoon} and Ning Li and Kwon, {Oh Hoon} and Woo, {Han Young} and Brabec, {Christoph J.} and Kim, {Jin Young}",

note = "Funding Information: This work was supported by the New Renewable Energy Core Technology Development Project of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20183010013900, 20173010012960). N. Li gratefully acknowledges the financial support from the DFG research grant BR 4031/13-1. C. J. Brabec gratefully acknowledges the financial support through the “Aufbruch Bayern” initiative of the state of Bavaria (EnCN and SFF), the Bavarian Initiative “Solar Technologies go Hybrid” (SolTech) and the funding by the DFG: 182849149 (SFB 953), DFG INST 90/917-1, DFG INST 90/726-3. H.Y.W. thanks the financial support from the NRF of Korea (NRF-2016M1A2A2940911 and 2019R1A6A1A11044070). Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

month = may,

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doi = "10.1021/acsenergylett.0c00564",

language = "English",

volume = "5",

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journal = "ACS Energy Letters",

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T1 - Efficient Exciton Diffusion in Organic Bilayer Heterojunctions with Nonfullerene Small Molecular Acceptors

AU - Lee, Tack Ho

AU - Park, Song Yi

AU - Park, Won Woo

AU - Du, Xiaoyan

AU - Son, Jae Hoon

AU - Li, Ning

AU - Kwon, Oh Hoon

AU - Woo, Han Young

AU - Brabec, Christoph J.

AU - Kim, Jin Young

N1 - Funding Information: This work was supported by the New Renewable Energy Core Technology Development Project of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20183010013900, 20173010012960). N. Li gratefully acknowledges the financial support from the DFG research grant BR 4031/13-1. C. J. Brabec gratefully acknowledges the financial support through the “Aufbruch Bayern” initiative of the state of Bavaria (EnCN and SFF), the Bavarian Initiative “Solar Technologies go Hybrid” (SolTech) and the funding by the DFG: 182849149 (SFB 953), DFG INST 90/917-1, DFG INST 90/726-3. H.Y.W. thanks the financial support from the NRF of Korea (NRF-2016M1A2A2940911 and 2019R1A6A1A11044070). Publisher Copyright: Copyright © 2020 American Chemical Society.

PY - 2020/5/8

Y1 - 2020/5/8

N2 - Solution-processed bilayer organic solar cells (OSCs) with high performance are demonstrated for nonfullerene small molecular acceptors (NFAs). Unlike fullerene acceptors, NFAs show significant spectral overlap between their absorption and the photoluminescence (PL) of a polymer donor, which makes the design of an efficient exciton-harvesting bilayer heterojunction possible. Efficient exciton diffusion in the organic bilayer heterojunction is realized by long-range energy transfer between a polymer donor and NFAs. We observed efficient exciton diffusion from the polymer/NFA bilayer heterojunctions via thickness-dependent PL quenching and time-resolved PL measurements. Despite the strongly reduced donor-acceptor interface area, a substantial density of charge-transfer states is observed for the polymer/NFA bilayer heterojunctions by electroluminescence measurements. Overall, polymer/NFA bilayer heterojunction OSCs demonstrate a power conversion efficiency of 9%-10%, which is comparable to the photovoltaic performance of bulk heterojunction OSCs, with the additional advantage of simplified microstructure formation.

AB - Solution-processed bilayer organic solar cells (OSCs) with high performance are demonstrated for nonfullerene small molecular acceptors (NFAs). Unlike fullerene acceptors, NFAs show significant spectral overlap between their absorption and the photoluminescence (PL) of a polymer donor, which makes the design of an efficient exciton-harvesting bilayer heterojunction possible. Efficient exciton diffusion in the organic bilayer heterojunction is realized by long-range energy transfer between a polymer donor and NFAs. We observed efficient exciton diffusion from the polymer/NFA bilayer heterojunctions via thickness-dependent PL quenching and time-resolved PL measurements. Despite the strongly reduced donor-acceptor interface area, a substantial density of charge-transfer states is observed for the polymer/NFA bilayer heterojunctions by electroluminescence measurements. Overall, polymer/NFA bilayer heterojunction OSCs demonstrate a power conversion efficiency of 9%-10%, which is comparable to the photovoltaic performance of bulk heterojunction OSCs, with the additional advantage of simplified microstructure formation.

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U2 - 10.1021/acsenergylett.0c00564

DO - 10.1021/acsenergylett.0c00564

M3 - Article

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SN - 2380-8195

VL - 5

SP - 1628

EP - 1635

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 5

ER -

Efficient Exciton Diffusion in Organic Bilayer Heterojunctions with Nonfullerene Small Molecular Acceptors

Abstract

ASJC Scopus subject areas

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