TY - JOUR AU - Wan, Juanyong AU - Xia, Yonggao AU - Fang, Junfeng AU - Zhang, Zhiguo AU - Xu, Bingang AU - Wang, Jinzhao AU - Ai, Ling AU - Song, Weijie AU - Hui, Kwun Nam AU - Fan, Xi AU - Li, Yongfang PY - 2021/01/04 Y2 - 2024/03/28 TI - Solution-Processed Transparent Conducting Electrodes for Flexible Organic Solar Cells with 16.61% Efficiency JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 13 IS - SE - Articles DO - 10.1007/s40820-020-00566-3 UR - https://nmlett.org/index.php/nml/article/view/808 SP - 44 AB - <p>Nonfullerene organic solar cells (OSCs) have achieved breakthrough with pushing the efficiency exceeding 17%. While this shed light on OSC commercialization, high-performance flexible OSCs should be pursued through solution manufacturing. Herein, we report a solution-processed flexible OSC based on a transparent conducting PEDOT:PSS anode doped with trifluoromethanesulfonic acid (CF<sub>3</sub>SO<sub>3</sub>H). Through a low-concentration and low-temperature CF<sub>3</sub>SO<sub>3</sub>H doping, the conducting polymer anodes exhibited a main sheet resistance of 35&nbsp;Ω&nbsp;sq<sup>−1</sup> (minimum value: 32&nbsp;Ω&nbsp;sq<sup>−1</sup>), a raised work function (≈ 5.0&nbsp;eV), a superior wettability, and a high electrical stability. The high work function minimized the energy level mismatch among the anodes, hole-transporting layers and electron-donors of the active layers, thereby leading to an enhanced carrier extraction. The solution-processed flexible OSCs yielded a record-high efficiency of 16.41% (maximum value: 16.61%). Besides, the flexible OSCs afforded the 1000 cyclic bending tests at the radius of 1.5&nbsp;mm and the long-time thermal treatments at 85&nbsp;°C, demonstrating a high flexibility and a good thermal stability.</p><p>Highlights:</p><p>1 The PEDOT:PSS flexible electrodes with a unique CF<sub>3</sub>SO<sub>3</sub>H treatment exhibited high electrical characteristics and stability.<br>2 An energy level tuning effect was induced to create a suitable work function.<br>3 Flexible organic solar cells yielded a record-high efficiency of 16.61%, a high flexibility, and a good thermal stability.</p> ER -