A new naphthalene diimide (NDI)‐based polymer with strong electron withdrawing dicyanothiophene (P(NDI2DT‐TTCN)) is developed as the electron transport layer (ETL) in place of the fullerene‐based ETL in inverted perovskite solar cells (Pero‐SCs). A combination of characterization techniques, including atomic force microscopy, scanning electron microscopy, grazing‐incidence wide‐angle X‐ray scattering, near‐edge X‐ray absorption fine‐structure spectroscopy, space‐charge‐limited current, electrochemical impedance spectroscopy, photoluminescence (PL), and time‐resolved PL decay, is used to demonstrate the interface phenomena between perovskite and P(NDI2DT‐TTCN) or [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM). It is found that P(NDI2DT‐TTCN) not only improves the electron extraction ability but also prevents ambient condition interference by forming a hydrophobic ETL surface. In addition, P(NDI2DT‐TTCN) has excellent mechanical stability compared to PCBM in flexible Pero‐SCs. With these improved functionalities, the performance of devices based on P(NDI2DT‐TTCN) significantly outperform those based on PCBM from 14.3 to 17.0%, which is the highest photovoltaic performance with negligible hysteresis in the field of polymeric ETLs.

中文翻译：

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使用新型基于NDI的聚合物作为电子传输层的反向平面柔性钙钛矿太阳能电池的性能和稳定性提高

开发了一种具有强吸电子二氰基噻吩（P（NDI2DT-TTCN））的新型基于萘二酰亚胺（NDI）的聚合物作为电子传输层（ETL）来代替钙钛矿型太阳能电池（Pero-SCs）中基于富勒烯的ETL ）。包括原子力显微镜，扫描电子显微镜，掠入射广角X射线散射，近边缘X射线吸收精细结构光谱，空间电荷限制电流，电化学阻抗光谱，光致发光在内的多种表征技术的组合（PL）和时间分辨的PL衰减用于证明钙钛矿与P（NDI2DT-TTCN）或[6,6]-苯基-C61-丁酸甲酯（PCBM）之间的界面现象。发现P（NDI2DT‐TTCN）不仅提高了电子提取能力，而且还通过形成疏水性ETL表面来防止环境干扰。此外，与柔性Pero-SC中的PCBM相比，P（NDI2DT-TTCN）具有出色的机械稳定性。通过这些改进的功能，基于P（NDI2DT-TTCN）的设备的性能从14.3％显着优于基于PCBM的设备，达到17.0％，这是聚合物ETL领域中具有可忽略的滞后性的最高光伏性能。