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

Faculty of Science and Engineering

Research output: Journal Publication › Article › peer-review

41 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

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

UN SDGs

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

Access to Document

10.1021/acs.jpclett.9b02837

Cite this

@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",

pages = "7100--7106",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

publisher = "American Chemical Society",

number = "22",

}

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=85074944693&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.9b02837

DO - 10.1021/acs.jpclett.9b02837

M3 - Article

C2 - 31682127

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

ASJC Scopus subject areas

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this