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Effect of Chlorine Substituents on the Photovoltaic Properties of Monocyanated Quinoxaline-Based D-A-Type Polymers

Authors
Lee, Seok WooHussain, MD. WaseemLee, JihoonWhang, Dong RyeolJeong, Woo HyeonChoi, HyosungChang, Dong Wook
Issue Date
Feb-2023
Publisher
AMER CHEMICAL SOC
Keywords
quinoxaline; chlorine; cyano; non-fullerene; polymer solar cells
Citation
ACS APPLIED MATERIALS&INTERFACES, v.15, no.4, pp.5547 - 5555
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED MATERIALS&INTERFACES
Volume
15
Number
4
Start Page
5547
End Page
5555
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185013
DOI
10.1021/acsami.2c19702
ISSN
1944-8244
Abstract
A string of monocyanated quinoxaline (Qx)-based D-A-type polymers systematically decorated with electron-attracting chlorine (Cl) atoms was created for use in non-fullerene polymer solar cells (PSCs). First, coupling of the benzodithiophene (BDT) donor and Qx acceptor with the strong electron-attracting cyano (CN) unit at its 5-position yielded the monocyanated reference polymer PB-CNQ. Subsequently, the additional Cl atoms were separately or simultaneously incorporated into the thiophene side groups of the BDT donor and Qx acceptor to create other objective polymers, PBCl-CNQ, PB-CNQCl, and PBCl-CNQCl. The Cl substituents on the BDT donor and Qx acceptor are represented by the names of the polymers. Owing to the favorable contributions of Cl substituents, the inverted-type non-fullerene PSCs based on partially chlorinated PBCl-CNQ (12.80%) and PB-CNQCl (13.93%) exhibited better power conversion efficiencies (PCEs) than the device based on unchlorinated reference PB-CNQ (11.19%). However, a significantly reduced PCE of 9.84% was observed for the device based on PBCl-CNQCl, in which Cl atoms were loaded on both the BDT donor and Qx acceptor at the same time. Hence, these results reveal that optimization of the number and position of Cl substituents in monocyanated Qx-based polymers is essential for enhancing their photovoltaic nature through the synergistic effects between two strong electron-attracting CN and Cl substituents.
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