Highly efficient planar heterojunction perovskite solar cells (PVSCs) with dopamine (DA) semiquinone radical modified poly(3,4‐ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (DA‐PEDOT:PSS) as a hole transporting layer (HTL) were fabricated. A combination of characterization techniques were employed to investigate the effects of DA doping on the electron donating capability of DA‐PEDOT:PSS, perovskite film quality and charge recombination kinetics in the solar cells. Our study shows that DA doping endows the DA‐PEDOT:PSS‐modified PVSCs with a higher radical content and greater perovskite to HTL charge extraction capability. In addition, the DA doping also improves work function of the HTL, increases perovskite film crystallinity, and the amino and hydroxyl groups in DA can interact with the undercoordinated Pb atoms on the perovskite crystal, reducing charge‐recombination rate and increasing charge‐extraction efficiency. Therefore, the DA‐PEDOT:PSS‐modified solar cells outperform those based on PEDOT:PSS, increasing open‐circuit voltage (V _oc) and power conversion efficiency (PCE) to 1.08 V and 18.5%, respectively. Even more importantly, the efficiency of the unencapsulated DA‐PEDOT:PSS‐based PVSCs are well retained with only 20% PCE loss after exposure to air for 250 hours. These in‐depth insights into structure and performance provide clear and novel guidelines for the design of effective HTLs to facilitate the practical application of inverted planar heterojunction PVSCs.

中文翻译：

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通过具有改善的陷阱钝化能力的多巴胺半醌自由基的双重功能化，实现高效，稳定的钙钛矿太阳能电池

制备了一种高效的平面异质结钙钛矿太阳能电池（PVSC），其具有多巴胺（DA）半醌自由基改性的聚（3,4-乙烯二氧噻吩）聚苯乙烯磺酸盐（PEDOT：PSS）（DA-PEDOT：PSS）作为空穴传输层（HTL）。 。结合表征技术，研究了DA掺杂对DA-PEDOT：PSS的给电子能力，钙钛矿薄膜质量和太阳能电池中电荷复合动力学的影响。我们的研究表明，DA掺杂赋予DA‐PEDOT：PSS改性的PVSC更高的自由基含量和更大的钙钛矿对HTL电荷提取能力。此外，DA掺杂还改善了HTL的功函数，增加了钙钛矿膜的结晶度，DA中的氨基和羟基可以与钙钛矿晶体上未配位的Pb原子相互作用，从而降低电荷复合率并提高电荷提取效率。因此，DA‐PEDOT：PSS改性的太阳能电池优于基于PEDOT：PSS的太阳能电池，从而增加了开路电压（V _oc）和功率转换效率（PCE）分别达到1.08 V和18.5％。更为重要的是，未封装的DA‐PEDOT：PSS的PVSC的效率得到了很好的保持，暴露于空气中250小时后PCE损失仅为20％。这些对结构和性能的深入了解为有效HTL的设计提供了清晰新颖的准则，以促进倒置平面异质结PVSC的实际应用。