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首页> 外文期刊>RSC Advances >Perovskite solar cells involving poly(tetraphenylbenzidine)s: investigation of hole carrier mobility, doping effects and photovoltaic properties
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Perovskite solar cells involving poly(tetraphenylbenzidine)s: investigation of hole carrier mobility, doping effects and photovoltaic properties

机译：涉及聚（四苯基苯苯胺）的钙钛矿太阳能电池：对空穴载体迁移率，掺杂效应和光伏性能的研究

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Perovskite solar cells in combination with organic hole transport materials have attracted attention due to their high power conversion efficiencies. Now that these high efficiencies have been reached, it is important to address fundamental questions regarding the requirements of the material properties. Here, we present a detailed study on important properties of the hole transport material such as the influence of the molecular weight, the doping effects on charge carrier mobility and the polarity of the material. A series of poly(tetraphenylbenzidines) (PTPDs) differing in their properties was synthesized via Yamamoto polycondensation. Using space charge limited current (SCLC) measurements, we find that the hole transport mobility is independent of the investigated molecular weight and polarity of the side chains. Doping of the PTPDs with a Co( III )-complex reveals that the charge carrier density increases through an oxidation process. Further, the solar cell performance improves upon doping. After storing the devices, the power conversion efficiencies of the solar cells drastically increase due to improved absorption leading to improved EQE. For example, the best performing cell exhibited a power conversion efficiency of 7.69%. Additionally, the PTPD carrying polar substituents leads to a less pronounced hysteresis effect and a higher stability under illumination compared to the polymer carrying hydrophobic side chains.
机译：由于其高功率转换效率，钙钛矿太阳能电池与有机孔输送材料的组合引起了受关注。现在已经达成了这些高效率，重要的是解决有关材料特性要求的基本问题。这里，我们对诸如分子量影响的空穴传输材料的重要特性，对电荷载流子迁移率的掺杂效应和材料极性的重要性研究。通过Yamamoto缩聚合成其性质的一系列聚（四苯基苯甲酰胺）（PTPDS）不同。使用空间充电有限电流（SCLC）测量，我们发现空穴运输迁移率与侧链的研究分子量和极性无关。用CO（III）的PTPDS掺杂-CONCELPLECL揭示了电荷载体密度通过氧化过程增加。此外，太阳能电池性能提高了掺杂。在存储设备之后，由于导致改善EQE的吸收，太阳能电池的功率转换效率随着导致的吸收而大大增加。例如，最佳性能的细胞表现出7.69％的功率转换效率。另外，与携带疏水侧链的聚合物相比，携带极性取代基的PTPD导致较少明显的滞后效果和更高的照明稳定性。

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