首页|Near-Infrared All-Fused-Ring Nonfullerene Acceptors Achieving an Optimal Efficiency-Cost-Stability Balance in Organic Solar Cells
Near-Infrared All-Fused-Ring Nonfullerene Acceptors Achieving an Optimal Efficiency-Cost-Stability Balance in Organic Solar Cells
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Synergistically achieving stability,cost,and efficiency is crucial for the commercialization of organic solar cells(OSCs).Despite the rapid development of 2-(3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile-typenonfullereneacceptors(NFAs),they are inherently unstable due to the vulnerable exocyclic double bond and possess high synthesis complexity(SC).Based on the"all-fused-ring electron acceptor(AFAR)"concept,we report two new near-infrared NFAs,F11 and F13,featuring all fused dodecacyclic rings.By developing a whole set of synthetic procedures,F11 and F13 can be conveniently prepared at a 10 g scale within a notably short period,displaying both the low SC and the lowest costs among reported NFAs,even comparable to the classical photovoltaic material,P3HT.In comparison with the one-dimensional stacking of ITYM(ITYM=2,2'-(7,7,15,15-tetrahexyl-7,15-dihydro-s-indaceno[1,2-b:5,6-b']diindeno[1,2-d]thiophene-2,10(2H)-diylidene)dimalononitrile),the first AFRA,and mixed J-and H-aggregations in Y6,F-acceptors show a compact honeycomb-type three-dimensional stacking with ex-clusive J-aggregations,favoring multichannel charge transport.By matching a medium-bandgap polymer donor,F13 delivers greater than 13％power conversion efficiencies,which is the highest performance among non-INCN acceptors,and shows device stability super-ior to the typical ITIC-and Y6-based OSCs as evidenced by the negligible burn-in losses.This work presents a first and successful example of NFAs achieving an opti-mal efficiency-cost-stability balance in OSCs.
Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190
School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049
Department of Chemistry,Shenzhen Grubbs Institute,Southern University of Science and Technology,Shenzhen 518055
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