Hole Transfer Originating from Weakly Bound Exciton Dissociation in Acceptor-Donor-Acceptor Nonfullerene Organic Solar Cells

Meng Si Niu; Kang Wei Wang; Xiao Yu Yang; Peng Qing Bi; Kang Ning Zhang; Xian Jin Feng; Fei Chen; Wei Qin; Jian Long Xia; Xiao Tao Hao

doi:10.1021/acs.jpclett.9b02837

Hole Transfer Originating from Weakly Bound Exciton Dissociation in Acceptor-Donor-Acceptor Nonfullerene Organic Solar Cells

Meng Si Niu
, Kang Wei Wang
, Xiao Yu Yang
, Peng Qing Bi
, Kang Ning Zhang
, Xian Jin Feng
, Fei Chen
, Wei Qin
, Jian Long Xia
, Xiao Tao Hao^*

^*Corresponding author for this work

Faculty of Science and Engineering

Research output: Journal Publication › Article › peer-review

54 Citations (Scopus)

Abstract

The underlying hole-transfer mechanism in high-efficiency OSC bulk heterojunctions based on acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) remains unclear. Herein, we study the hole-transfer process between copolymer donor J91 and five A-D-A NFAs with different highest occupied molecular orbital energy offsets (Î"E_H) (0.05-0.42 eV) via ultrafast optical spectroscopies. Transient absorption spectra reveal a rapid hole-transfer rate with small Î"E_H, suggesting that a large energy offset is not required to overcome the exciton binding energy. Capacitance-frequency spectra and time-resolved photoluminescence spectra confirm the delocalization of an A-D-A-structured acceptor exciton with weak binding energy. Relative to the hole-transfer rate, hole-transfer efficiency is the key factor affecting device performance. We propose that holes primarily stem from weakly bound acceptor exciton dissociation, revealing a new insight into the hole-transfer process in A-D-A NFA-based OSCs.

Original language	English
Pages (from-to)	7100-7106
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	10
Issue number	22
DOIs	https://doi.org/10.1021/acs.jpclett.9b02837
Publication status	Published - 21 Nov 2019

UN SDGs

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

SDG 7 Affordable and Clean Energy

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/acs.jpclett.9b02837

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@article{f3be410906eb4475a0007cd363a3533d,

title = "Hole Transfer Originating from Weakly Bound Exciton Dissociation in Acceptor-Donor-Acceptor Nonfullerene Organic Solar Cells",

abstract = "The underlying hole-transfer mechanism in high-efficiency OSC bulk heterojunctions based on acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) remains unclear. Herein, we study the hole-transfer process between copolymer donor J91 and five A-D-A NFAs with different highest occupied molecular orbital energy offsets ({\^I}{"}EH) (0.05-0.42 eV) via ultrafast optical spectroscopies. Transient absorption spectra reveal a rapid hole-transfer rate with small {\^I}{"}EH, suggesting that a large energy offset is not required to overcome the exciton binding energy. Capacitance-frequency spectra and time-resolved photoluminescence spectra confirm the delocalization of an A-D-A-structured acceptor exciton with weak binding energy. Relative to the hole-transfer rate, hole-transfer efficiency is the key factor affecting device performance. We propose that holes primarily stem from weakly bound acceptor exciton dissociation, revealing a new insight into the hole-transfer process in A-D-A NFA-based OSCs.",

author = "Niu, \{Meng Si\} and Wang, \{Kang Wei\} and Yang, \{Xiao Yu\} and Bi, \{Peng Qing\} and Zhang, \{Kang Ning\} and Feng, \{Xian Jin\} and Fei Chen and Wei Qin and Xia, \{Jian Long\} and Hao, \{Xiao Tao\}",

note = "Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = nov,

day = "21",

doi = "10.1021/acs.jpclett.9b02837",

language = "English",

volume = "10",

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journal = "Journal of Physical Chemistry Letters",

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T1 - Hole Transfer Originating from Weakly Bound Exciton Dissociation in Acceptor-Donor-Acceptor Nonfullerene Organic Solar Cells

AU - Niu, Meng Si

AU - Wang, Kang Wei

AU - Yang, Xiao Yu

AU - Bi, Peng Qing

AU - Zhang, Kang Ning

AU - Feng, Xian Jin

AU - Chen, Fei

AU - Qin, Wei

AU - Xia, Jian Long

AU - Hao, Xiao Tao

PY - 2019/11/21

Y1 - 2019/11/21

N2 - The underlying hole-transfer mechanism in high-efficiency OSC bulk heterojunctions based on acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) remains unclear. Herein, we study the hole-transfer process between copolymer donor J91 and five A-D-A NFAs with different highest occupied molecular orbital energy offsets (Î"EH) (0.05-0.42 eV) via ultrafast optical spectroscopies. Transient absorption spectra reveal a rapid hole-transfer rate with small Î"EH, suggesting that a large energy offset is not required to overcome the exciton binding energy. Capacitance-frequency spectra and time-resolved photoluminescence spectra confirm the delocalization of an A-D-A-structured acceptor exciton with weak binding energy. Relative to the hole-transfer rate, hole-transfer efficiency is the key factor affecting device performance. We propose that holes primarily stem from weakly bound acceptor exciton dissociation, revealing a new insight into the hole-transfer process in A-D-A NFA-based OSCs.

AB - The underlying hole-transfer mechanism in high-efficiency OSC bulk heterojunctions based on acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) remains unclear. Herein, we study the hole-transfer process between copolymer donor J91 and five A-D-A NFAs with different highest occupied molecular orbital energy offsets (Î"EH) (0.05-0.42 eV) via ultrafast optical spectroscopies. Transient absorption spectra reveal a rapid hole-transfer rate with small Î"EH, suggesting that a large energy offset is not required to overcome the exciton binding energy. Capacitance-frequency spectra and time-resolved photoluminescence spectra confirm the delocalization of an A-D-A-structured acceptor exciton with weak binding energy. Relative to the hole-transfer rate, hole-transfer efficiency is the key factor affecting device performance. We propose that holes primarily stem from weakly bound acceptor exciton dissociation, revealing a new insight into the hole-transfer process in A-D-A NFA-based OSCs.

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DO - 10.1021/acs.jpclett.9b02837

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AN - SCOPUS:85074944693

SN - 1948-7185

VL - 10

SP - 7100

EP - 7106

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 22

ER -

Hole Transfer Originating from Weakly Bound Exciton Dissociation in Acceptor-Donor-Acceptor Nonfullerene Organic Solar Cells

Abstract

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