Effect of the energy offset on the charge dynamics in nonfullerene organic solar cells

Yunhao Cai; Huotian Zhang; Linglong Ye; Rui Zhang; Jinqiu Xu; Kangning Zhang; Pengqing Bi; Tengfei Li; Kangkang Weng; Ke Xu; Jianlong Xia; Qinye Bao; Feng Liu; Xiaotao Hao; Songting Tan; Feng Gao; Xiaowei Zhan; Yanming Sun

doi:10.1021/acsami.0c13085

Effect of the energy offset on the charge dynamics in nonfullerene organic solar cells

Yunhao Cai, Huotian Zhang, Linglong Ye, Rui Zhang, Jinqiu Xu, Kangning Zhang, Pengqing Bi, Tengfei Li, Kangkang Weng, Ke Xu, Jianlong Xia^*, Qinye Bao, Feng Liu, Xiaotao Hao, Songting Tan, Feng Gao, Xiaowei Zhan, Yanming Sun^*

^*Corresponding author for this work

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

19 Citations (Scopus)

Abstract

The energy offset, considered as the driving force for charge transfer between organic molecules, has significant effects on both charge separation and charge recombination in organic solar cells. Herein, we designed material systems with gradually shifting energy offsets, including both positive and negative values. Time-resolved spectroscopy was used to monitor the charge dynamics within the bulk heterojunction. It is striking to find that there is still charge transfer and charge generation when the energy offset reached −0.10 eV (ultraviolet photoelectron spectroscopy data). This work not only indicates the feasibility of the free carrier generation and the following charge separation under the condition of a negative offset but also elucidates the relationship between the charge transfer and the energy offset in the case of polymer chlorination.

Original language	English
Pages (from-to)	43984-43991
Number of pages	8
Journal	ACS applied materials & interfaces
Volume	12
Issue number	39
DOIs	https://doi.org/10.1021/acsami.0c13085
Publication status	Published - 30 Sept 2020
Externally published	Yes

Keywords

Charge generation
Charge transfer
Chlorination
Negative offset
Organic solar cells

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10.1021/acsami.0c13085

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title = "Effect of the energy offset on the charge dynamics in nonfullerene organic solar cells",

abstract = "The energy offset, considered as the driving force for charge transfer between organic molecules, has significant effects on both charge separation and charge recombination in organic solar cells. Herein, we designed material systems with gradually shifting energy offsets, including both positive and negative values. Time-resolved spectroscopy was used to monitor the charge dynamics within the bulk heterojunction. It is striking to find that there is still charge transfer and charge generation when the energy offset reached −0.10 eV (ultraviolet photoelectron spectroscopy data). This work not only indicates the feasibility of the free carrier generation and the following charge separation under the condition of a negative offset but also elucidates the relationship between the charge transfer and the energy offset in the case of polymer chlorination.",

keywords = "Charge generation, Charge transfer, Chlorination, Negative offset, Organic solar cells",

author = "Yunhao Cai and Huotian Zhang and Linglong Ye and Rui Zhang and Jinqiu Xu and Kangning Zhang and Pengqing Bi and Tengfei Li and Kangkang Weng and Ke Xu and Jianlong Xia and Qinye Bao and Feng Liu and Xiaotao Hao and Songting Tan and Feng Gao and Xiaowei Zhan and Yanming Sun",

note = "Publisher Copyright: {\textcopyright} 2020 American Chemical Society",

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doi = "10.1021/acsami.0c13085",

language = "English",

volume = "12",

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journal = "ACS applied materials & interfaces",

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TY - JOUR

T1 - Effect of the energy offset on the charge dynamics in nonfullerene organic solar cells

AU - Cai, Yunhao

AU - Zhang, Huotian

AU - Ye, Linglong

AU - Zhang, Rui

AU - Xu, Jinqiu

AU - Zhang, Kangning

AU - Bi, Pengqing

AU - Li, Tengfei

AU - Weng, Kangkang

AU - Xu, Ke

AU - Xia, Jianlong

AU - Bao, Qinye

AU - Liu, Feng

AU - Hao, Xiaotao

AU - Tan, Songting

AU - Gao, Feng

AU - Zhan, Xiaowei

AU - Sun, Yanming

PY - 2020/9/30

Y1 - 2020/9/30

N2 - The energy offset, considered as the driving force for charge transfer between organic molecules, has significant effects on both charge separation and charge recombination in organic solar cells. Herein, we designed material systems with gradually shifting energy offsets, including both positive and negative values. Time-resolved spectroscopy was used to monitor the charge dynamics within the bulk heterojunction. It is striking to find that there is still charge transfer and charge generation when the energy offset reached −0.10 eV (ultraviolet photoelectron spectroscopy data). This work not only indicates the feasibility of the free carrier generation and the following charge separation under the condition of a negative offset but also elucidates the relationship between the charge transfer and the energy offset in the case of polymer chlorination.

AB - The energy offset, considered as the driving force for charge transfer between organic molecules, has significant effects on both charge separation and charge recombination in organic solar cells. Herein, we designed material systems with gradually shifting energy offsets, including both positive and negative values. Time-resolved spectroscopy was used to monitor the charge dynamics within the bulk heterojunction. It is striking to find that there is still charge transfer and charge generation when the energy offset reached −0.10 eV (ultraviolet photoelectron spectroscopy data). This work not only indicates the feasibility of the free carrier generation and the following charge separation under the condition of a negative offset but also elucidates the relationship between the charge transfer and the energy offset in the case of polymer chlorination.

KW - Charge generation

KW - Charge transfer

KW - Chlorination

KW - Negative offset

KW - Organic solar cells

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U2 - 10.1021/acsami.0c13085

DO - 10.1021/acsami.0c13085

M3 - Article

C2 - 32885945

AN - SCOPUS:85092681071

SN - 1944-8244

VL - 12

SP - 43984

EP - 43991

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

IS - 39

ER -

Effect of the energy offset on the charge dynamics in nonfullerene organic solar cells

Abstract

Keywords

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