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Less is More: Dopant‐Free Hole Transporting Materials for High‐Efficiency Perovskite Solar Cells
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2018-01-08 , DOI: 10.1002/aenm.201702512
Weiqi Zhou 1, 2, 3 , Zhenhai Wen 1 , Peng Gao 1, 2
Affiliation  

Perovskite solar cells have delivered power conversion efficiency beyond 22% in less than seven years, implying the potential for the paradigm shift of low‐cost photovoltaics with high efficiency and low embedded energy. Besides the “perovskite fever,” the development of new hole transport materials (HTM), especially dopant‐free HTMs, is another research hotspot. This is because the currently used HTMs, such as spiro‐OMeTAD derivatives, require additional chemical doping process to ensure sufficient conductivity and proper ionic potential level for efficient hole transport and collection. However, the commonly used dopants are volatile and hygroscopic which not only increase the complexity and cost of device fabrication but also deteriorate the device stability. So far, there have been several reviews on new HTMs, but review or analysis on dopant‐free HTMs is scarce. In this review, all reported dopant‐free HTMs are categorized into four primary different types and lessons will be learned during the separate discussions. The stability test behavior of all the intrinsic HTMs will be evaluated directly. In the end, the correlations between the properties of the intrinsic HTMs and parameters of the devices will be plotted to shed light on the future direction of development of this field.

中文翻译:

少即是多:高效钙钛矿太阳能电池用无掺杂空穴传输材料

钙钛矿太阳能电池在不到七年的时间内提供了超过22%的功率转换效率,这暗示着低成本光伏具有高效率和低嵌入能量的范式转变的潜力。除了“钙钛矿热”以外,新的空穴传输材料(HTM),特别是无掺杂的HTM的开发是另一个研究热点。这是因为当前使用的HTM(例如spiro-OMeTAD衍生物)需要额外的化学掺杂工艺,以确保足够的电导率和适当的离子电势水平,以实现有效的空穴传输和收集。然而,常用的掺杂剂是挥发性的和吸湿性的,这不仅增加了器件制造的复杂性和成本,而且还降低了器件的稳定性。到目前为止,有关新HTM的评论有很多,但是缺乏对无掺杂HTM的审查或分析。在本次审查中,所有报告的无掺杂HTM都分为四种主要的不同类型,在单独的讨论中将汲取经验教训。所有固有HTM的稳定性测试行为将直接进行评估。最后,将绘制内部HTM的属性与设备参数之间的相关性,以阐明该领域的未来发展方向。
更新日期:2018-01-08
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