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首页> 外文期刊>Advanced Functional Materials >Sulfate-Assisted Interfacial Engineering for High Yield and Efficiency of Triple Cation Perovskite Solar Cells with Alkali-Doped TiO_2 Electron-Transporting Layers
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Sulfate-Assisted Interfacial Engineering for High Yield and Efficiency of Triple Cation Perovskite Solar Cells with Alkali-Doped TiO_2 Electron-Transporting Layers

机译：硫酸盐辅助界面工程可提高碱掺杂TiO_2电子传输层的三阳离子钙钛矿太阳能电池的产量和效率。

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摘要

Facile electron injection and extraction are two key attributes desired in electron transporting layers to enhance the efficiency of planar perovskite solar cells. Herein it is demonstrated that the incorporation of alkali metal dopants in mesoporous TiO2 can effectively modulate electronic conductivity and improve the charge extraction process by counterbalancing oxygen vacancies acting as nonradiative recombination centers. Moreover, sulfate bridges (SO42-) grafted on the surface of K-doped mesoporous titania provide a seamless integration of absorber and electron-transporting layers that accelerate overall transport kinetics. Potassium doping markedly influences the nucleation of the perovskite layer to produce highly dense films with facetted crystallites. Solar cells made from K:TiO2 electrodes exhibit power conversion efficiencies up to 21.1% with small hysteresis despite all solution coating processes conducted under ambient air conditions (controlled humidity: 25-35%). The higher device efficiencies are attributed to intrinsically tuned electronic conductivity and chemical modification of grain boundaries enabling uniform coverage of perovskite films with large grain size.
机译：容易的电子注入和提取是电子传输层中需要的两个关键属性，以提高平面钙钛矿太阳能电池的效率。在此证明，通过平衡用作非辐射复合中心的氧空位，在中孔TiO 2中掺入碱金属掺杂剂可以有效地调节电子电导率并改善电荷提取过程。此外，接枝在K掺杂的中孔二氧化钛表面的硫酸盐桥（SO42-）提供了吸收体和电子传输层的无缝结合，从而加速了整体传输动力学。钾掺杂显着影响钙钛矿层的形核，从而产生具有多面微晶的高致密膜。尽管所有溶液涂覆过程均在环境空气条件下（受控湿度：25％至35％）进行，但由K：TiO2电极制成的太阳能电池仍具有高达21.1％的功率转换效率，并具有较小的磁滞。较高的器件效率归因于固有调节的电子电导率和晶界的化学修饰，可均匀覆盖大粒径的钙钛矿薄膜。

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