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3D Interpenetrating Network for High-Performance Nonfullerene Acceptors via Asymmetric Chlorine Substitution
Hanjian Lai1,2, Hui Chen1, Jiadong Zhou3
1Shenzhen Grubbs Institute and Department of Chemistry , Southern University of Science and Technology , Shenzhen 518055 , P. R. China.
Abstract:
Two chlorine-substituted isomers, ITIC-2Cl-β and , were synthesized for potential use as nonfullerene acceptors. The two molecules differ in the position of chlorine atoms, leading to symmetric (ITIC-2Cl-β) and asymmetric () molecular configuration. In single crystals, the two molecules exhibit a completely different arrangement and stacking as derived from X-ray diffraction analysis. Whereas ITIC-2Cl-β has a linear packing structure, forms a 3D interpenetrating network structure with shorter π-π distances and better molecular planarity. Therefore, a high power conversion efficiency of >12% is obtained by -based devices. It is ∼10% higher than that of ITIC-2Cl-β-based devices due to the chlorine substituent effect. Thus the fine-tuning of the Cl-substituted position seems to be a promising strategy to construct a 3D interpenetrating charge transportation network and achieve higher performance organic solar cells (OSCs).
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