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Title: Enhancement in Open-Circuit Voltage in Organic Solar Cells by Using Ladder-Type Nonfullerene Acceptors

Abstract

The open-circuit voltage (Voc) loss has always been a major factor in lowering power conversion efficiencies (PCEs) in bulk heterojunction organic photovoltaic cells (OPVs). A method to improve the Voc is indispensable to achieve high PCEs. Here in this paper, we investigated a series of perylene diimide-based ladder-type molecules as electron acceptors in nonfullerene OPVs. The D-A ladder-type structures described here lock our pi-systems into a planar structure and eliminate bond twisting associated with linear conjugated systems. This enlarges the interface energy gap (ΔEDA), extends electronic delocalization, and hence improves the Voc. More importantly, these devices showed an increase in Voc without compromising either the Jsc or the FF. C5r exhibited a strong intermolecular interaction and a PCE value of 6.1%. Moreover, grazing-incident wide-angle X-ray scattering analysis and atomic force microscopy images suggested that our fused-ring acceptors showed a suitable domain size and uniform blend films, which were not affected by their rigid molecular structures.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy Activated Redox Processes (LEAP); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1438253
Grant/Contract Number:  
AC02-06CH11357; SC0001059
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 16; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; ladder-type molecules; nonfullerene acceptor; open-circuit voltage improvement; organic solar cells; ring-fusing effect

Citation Formats

Cai, Zhengxu, Zhao, Donglin, Sharapov, Valerii, Awais, Mohammad A., Zhang, Na, Chen, Wei, and Yu, Luping. Enhancement in Open-Circuit Voltage in Organic Solar Cells by Using Ladder-Type Nonfullerene Acceptors. United States: N. p., 2018. Web. doi:10.1021/acsami.8b01308.
Cai, Zhengxu, Zhao, Donglin, Sharapov, Valerii, Awais, Mohammad A., Zhang, Na, Chen, Wei, & Yu, Luping. Enhancement in Open-Circuit Voltage in Organic Solar Cells by Using Ladder-Type Nonfullerene Acceptors. United States. https://doi.org/10.1021/acsami.8b01308
Cai, Zhengxu, Zhao, Donglin, Sharapov, Valerii, Awais, Mohammad A., Zhang, Na, Chen, Wei, and Yu, Luping. Wed . "Enhancement in Open-Circuit Voltage in Organic Solar Cells by Using Ladder-Type Nonfullerene Acceptors". United States. https://doi.org/10.1021/acsami.8b01308. https://www.osti.gov/servlets/purl/1438253.
@article{osti_1438253,
title = {Enhancement in Open-Circuit Voltage in Organic Solar Cells by Using Ladder-Type Nonfullerene Acceptors},
author = {Cai, Zhengxu and Zhao, Donglin and Sharapov, Valerii and Awais, Mohammad A. and Zhang, Na and Chen, Wei and Yu, Luping},
abstractNote = {The open-circuit voltage (Voc) loss has always been a major factor in lowering power conversion efficiencies (PCEs) in bulk heterojunction organic photovoltaic cells (OPVs). A method to improve the Voc is indispensable to achieve high PCEs. Here in this paper, we investigated a series of perylene diimide-based ladder-type molecules as electron acceptors in nonfullerene OPVs. The D-A ladder-type structures described here lock our pi-systems into a planar structure and eliminate bond twisting associated with linear conjugated systems. This enlarges the interface energy gap (ΔEDA), extends electronic delocalization, and hence improves the Voc. More importantly, these devices showed an increase in Voc without compromising either the Jsc or the FF. C5r exhibited a strong intermolecular interaction and a PCE value of 6.1%. Moreover, grazing-incident wide-angle X-ray scattering analysis and atomic force microscopy images suggested that our fused-ring acceptors showed a suitable domain size and uniform blend films, which were not affected by their rigid molecular structures.},
doi = {10.1021/acsami.8b01308},
journal = {ACS Applied Materials and Interfaces},
number = 16,
volume = 10,
place = {United States},
year = {2018},
month = {3}
}

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