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      Over 14.5% efficiency and 71.6% fill factor of ternary organic solar cells with 300 nm thick active layers

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          A 14.57% PCE is achieved in optimized ternary OSCs with 300 nm active layers compatible with R2R large-scale printing process, indicating that thick-film ternary strategy has great potential in achieving efficient large-scale OSCs.


          The ternary strategy exhibits great potential in optimizing the photon harvesting and phase separation of active layers. In this work, non-fullerene MF1 was selected as the third component to prepare efficient ternary organic solar cells (OSCs) by finely optimizing the MF1 content in the acceptors. The optimized power conversion efficiency (PCE) of 15.31% is achieved in the ternary OSCs with 20 wt% MF1 content in the acceptors and 100 nm active layer thickness, also exhibiting a relatively high fill factor (FF) of 78.05%. The relatively high FF indicates efficient charge transport and collection in the optimized ternary OSCs, which should be beneficial to achieve efficient thick-film OSCs. It is highlighted that a PCE of 14.57% is achieved in the optimized ternary OSCs with 300 nm thick active layers compatible with the roll-to-roll (R2R) large-scale printing process. To date, high performance thick-film ternary non-fullerene OSCs have seldom been reported. This work indicates that the thick-film ternary strategy has great potential in achieving efficient large-scale OSCs.

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          Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core

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            Is Open Access

            Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages

            Broadening the optical absorption of organic photovoltaic (OPV) materials by enhancing the intramolecular push-pull effect is a general and effective method to improve the power conversion efficiencies of OPV cells. However, in terms of the electron acceptors, the most common molecular design strategy of halogenation usually results in down-shifted molecular energy levels, thereby leading to decreased open-circuit voltages in the devices. Herein, we report a chlorinated non-fullerene acceptor, which exhibits an extended optical absorption and meanwhile displays a higher voltage than its fluorinated counterpart in the devices. This unexpected phenomenon can be ascribed to the reduced non-radiative energy loss (0.206 eV). Due to the simultaneously improved short-circuit current density and open-circuit voltage, a high efficiency of 16.5% is achieved. This study demonstrates that finely tuning the OPV materials to reduce the bandgap-voltage offset has great potential for boosting the efficiency.
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              High-efficiency small-molecule ternary solar cells with a hierarchical morphology enabled by synergizing fullerene and non-fullerene acceptors


                Author and article information

                Energy & Environmental Science
                Energy Environ. Sci.
                Royal Society of Chemistry (RSC)
                March 18 2020
                : 13
                : 3
                : 958-967
                [1 ]Key Laboratory of Luminescence and Optical Information
                [2 ]Ministry of Education
                [3 ]Beijing Jiaotong University
                [4 ]Beijing
                [5 ]P. R. China
                [6 ]Shenzhen Key Laboratory of Polymer Science and Technology
                [7 ]College of Materials Science and Engineering
                [8 ]Shenzhen University
                [9 ]Shenzhen
                [10 ]State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials, School of Materials Science and Engineering
                [11 ]Zhengzhou University
                [12 ]Zhengzhou
                © 2020




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