首页|π-Extension and chlorination of non-fullerene acceptors enable more readily processable and sustainable high-performance organic solar cells

π-Extension and chlorination of non-fullerene acceptors enable more readily processable and sustainable high-performance organic solar cells

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Organic solar cells(OSCs)processed without halogenated solvents and complex treatments are essential for future commercialization.Herein,we report three novel small molecule acceptors(NFAs)consisting of a Y6-like core but with π-extended naphthalene with progressively more chlorinated end-capping groups and a longer branched chain on the Nitrogen atom.These NFAs exhibit good solubilities in non-chlorinated organic solvents,broad optical absorptions,close π-π stacking distances(3.63-3.84 A),and high electron mobilities(～10-3 cm2 V-1 s-1).The o-xylene processed and as-cast binary devices using PM6 as the donor polymer exhibit a PCE increasing upon progressive chlorination of the naphthalene end-capping group from 8.93％for YN to 14.38％for YN-Cl to 15.00％for YN-2Cl.Furthermore similarly processed ternary OSCs were fabricated by employing YN-Cl and YN-2Cl as the third component of PM6:CH1007 blends(PCE=15.75％).Compared to all binary devices,the ternary PM6∶CH1007∶YN-Cl(1∶1∶0.2)and PM6∶CH1007∶YN-2Cl(1∶1∶0.2)cells exhibit significantly improved PCEs of 16.49％and 15.88％,respectively,which are among the highest values reported to date for non-halogenated solvent processed OSCs without using any additives and blend post-deposition treatments.

Non-fullerene acceptorsNon-chlorinated organic solventsOrganic solar cells

Ning Su、Jianhua Chen、Mengran Peng、Guoping Li、Robert M.Pankow、Ding Zheng、Junqiao Ding、Antonio Facchetti、Tobin J.Marks

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Department of Chemical Science and Technology,Yunnan University,Kunming 650500,Yunnan,China

Department of Chemistry and the Materials Research Center,Northwestern University,Evanston,IL 60208,USA

National Natural Science Foundation of ChinaCenter for Light Energy Activated Redox Processes(LEAP)an Energy Frontier Research Center funded by the U.S.Department of Energy,Office of Science,Office of Basic Energy SciencesMatCl Facility which receives support from the National Science Foundation MRSEC Program of the Materials Research Center atUS Office of Naval ResearchU.S.Department of EnergyU.S.Department of Energy(DOE)Office of Science User Facility operated for the DOE Office of Science by Argonne National Laborato

61804073DE-SC0001059NSF DMR-1720139N00014-20-1-2116DE-AC02-05CH11231DE-AC02-06CH11357

2023

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDCSCD北大核心EI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2023.79(4)
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