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      Tuning the electron-deficient core of a non-fullerene acceptor to achieve over 17% efficiency in a single-junction organic solar cell

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          Abstract

          A new small molecule acceptor, Y18, was designed and synthesized. Over 17% efficiency was obtained with single junction solar cells based on Y18.

          Abstract

          Finding effective molecular design strategies to enable efficient charge generation and small energy loss is among the long-standing challenges in developing high performance non-fullerene organic solar cells (OSCs). Recently, we reported Y-series non-fullerene acceptors with an electron-deficient-core-based fused structure (typically Y6), opening a new door to achieve high external quantum efficiency (∼80%) while maintaining low energy loss (∼0.57 eV). On this basis, further reducing the energy losses and ultimately improving the performance of OSCs has become a research hotspot. In this paper, we design and synthesize a new member of the Y-series acceptor family, Y18, which adopts a fused benzotriazole segment with unique luminescence properties as its electron-deficient core. Compared to Y6, the benzotriazole-based acceptor Y18 exhibits extended optical absorption and higher voltage. Consequently, the device delivers a promising power conversion efficiency of 16.52% with a very low energy loss of 0.53 eV. Further device optimization by exploiting a ternary blend strategy allowed us to achieve a high efficiency of 17.11% (certified as 16.76% by NREL). Y18 may become one of the most important candidate materials for its broader absorption spectra and higher voltage of Y18 (compared to Y6) in the OSCs field.

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          Author and article information

          Contributors
          Journal
          EESNBY
          Energy & Environmental Science
          Energy Environ. Sci.
          Royal Society of Chemistry (RSC)
          1754-5692
          1754-5706
          August 13 2020
          2020
          : 13
          : 8
          : 2459-2466
          Affiliations
          [1 ]College of Chemistry and Chemical Engineering
          [2 ]Central South University
          [3 ]Changsha
          [4 ]P. R. China
          [5 ]Beijing National Laboratory for Molecular Sciences
          [6 ]CAS Key Laboratory of Organic Solids
          [7 ]Institute of Chemistry
          [8 ]Chinese Academy of Sciences
          [9 ]Beijing 100190
          [10 ]Department of Physics, Chemistry and Biology (IFM)
          [11 ]Linköping University
          [12 ]Linköping 58183
          [13 ]Sweden
          [14 ]Department of Energy Engineering, School of Energy and Chemical Engineering
          [15 ]Perovtronics Research Center
          [16 ]Low Dimensional Carbon Materials Center
          [17 ]Ulsan National Institute of Science and Technology (UNIST)
          [18 ]Ulsan 44919
          Article
          10.1039/D0EE00862A
          ac05b56f-bee2-4772-825b-fde4aa75dec7
          © 2020

          http://rsc.li/journals-terms-of-use

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