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Europium ions doped WOx nanorods for dual interfacial modification facilitating high efficiency and stability of perovskite solar cells
Nano Energy ( IF 16.8 ) Pub Date : 2020-11-04 , DOI: 10.1016/j.nanoen.2020.105564
Xu Chen , Wen Xu , Zhifeng Shi , Gencai Pan , Jinyang Zhu , Junhua Hu , Xinjian Li , Chongxin Shan , Hongwei Song

Interface engineering is of great signification for high-performance of organic–inorganic halide perovskite solar cells (PSCs). Herein, we report a dual interface modification strategy for constructing effective and stable PSCs by simultaneously incorporating the europium ions doped WOx nanorods (Eu-WOx) into electron transport layer (ETL) and hole transport layer (HTL). A significant hysteresis-free power conversion efficiency (PCE) with 22.08%, and much better UV light/long term-stability of PSCs are achieved as compared to 19.03% for the reference one. Systematic investigations elucidate that Eu-WOx nanorods significantly contribute to the improved conductivity, carrier mobility of both SnO2 ETL and Spiro-OMeTAD HTL, and the crystalline quality of the perovskite film with the large grain size. Meanwhile, because of the perfect energy band alignment of Eu-WOx nanorods, the electrons/holes extraction efficiencies at perovskite/ETL and perovskite/HTL interfaces in PSCs are remarkably boosted. This finding highlights that Eu-WOx nanorods as the interface modifier provide a versatile avenue to construct efficient and stable PSCs for practical applications.



中文翻译:

dual离子掺杂的WO x纳米棒用于双界面改性,有助于钙钛矿太阳能电池的高效和稳定

界面工程对于高性能有机-无机卤化物钙钛矿太阳能电池(PSC)具有重要意义。在这里,我们报告了通过同时掺入掺有WO离子的WO x纳米棒(Eu-WO x)到电子传输层(ETL)和空穴传输层(HTL)中来构建有效和稳定的PSC的双界面修饰策略。与参考文献中的19.03%相比,PSC的无磁滞功率转换效率(PCE)显着提高,达到22.08%,并且具有更好的紫外线/ PSC长期稳定性。系统研究表明,Eu-WO x纳米棒显着有助于改善SnO 2的电导率和载流子迁移率ETL和Spiro-OMeTAD HTL,以及具有大晶粒尺寸的钙钛矿薄膜的结晶质量。同时,由于Eu-WO x纳米棒的完美能带排列,显着提高了PSC中钙钛矿/ ETL和钙钛矿/ HTL界面的电子/空穴提取效率。这一发现突出表明,作为界面改性剂的Eu-WO x纳米棒为构建适用于实际应用的高效稳定的PSC提供了一条通用途径。

更新日期:2020-11-09
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