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Side-Chain Engineering of Y-Series Acceptors with Halogenated End-Group for Efficient Indoor Organic Photovoltaics

Authors
Saeed, Muhammad AhsanXuyao, SongKim, Hyeon SuLee, Gyeong MinAhn, HyungjuKim, Yun-HiShim, Jae Won
Issue Date
Dec-2023
Publisher
John Wiley and Sons Inc
Keywords
end-group modification; indoor organic photovoltaics; side-chain engineering; ternary solar cell; Y-series acceptors
Citation
Advanced Optical Materials
Indexed
SCIE
SCOPUS
Journal Title
Advanced Optical Materials
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/68837
DOI
10.1002/adom.202302145
ISSN
2195-1071
2195-1071
Abstract
Diverse design strategies for nonfullerene acceptors (NFAs) have aided the development of efficient indoor organic photovoltaics (OPVs) for Internet-of-things-enabled gadgets. However, the side-chain approach to Y-series NFAs for fabricating indoor OPVs remains largely unexplored. In this study, the synthesis and photovoltaic characteristics of two side-chain engineered NFAs with halogenated end-groups (BTP-PO-4F and BTP-PO-4Cl) are investigated. NFAs with a Y6 core unit are modified with butyloctyl inner side chains and ethylhexyloxynaphthyl outer side chains. The extended conjugation moiety contributed to red-shifted absorption, with the chlorination effect presenting a more pronounced influence than fluorination. Further, the outer moiety introduced a slight electron-withdrawing effect on the Y6 core unit, resulting in energy-level downshifts. An excellent power conversion efficiency (PCE) of 23.2% is achieved in fluorinated OPVs under a light-emitting diode lamp (1000 lux). Moreover, integrating the Y6 NFA into the binary blend further enhanced the PCE, reaching 28.3% in PM6:Y6:halogenated NFA ternary OPVs. The panchromatic absorption, high crystallinity, and cascaded energy levels of the ternary blends contribute to achieving a sufficient spectral match and suppress trap-assisted recombination, ultimately fostering a substantially enhanced fill factor and PCEs under indoor lighting. © 2023 Wiley-VCH GmbH.
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