Core–shell nanomaterials have led to their fascinating properties in optical applications due to the localized surface plasmon resonance (LSPR). Herein, a mesoporous core–shell Au@Cu_2−x S nanomaterial with dual LSPR characteristics is introduced to stabilize and passivate the perovskite/spiro-OMeTAD interface of perovskite solar cells (PSCs). Thanks to the LSPR, Au@Cu_2−x S nanoparticles (NPs) have the potential to enhance the infrared absorption and intensify the local electric field at the perovskite/spiro-OMeTAD interface. The embedding of the mesoporous Au@Cu_2−x S in the spiro-OMeTAD layer can improve the contact and form “bridges” between perovskite grains and spiro-OMeTAD. With the help of cationic surfactant cetyltrimethylammonium bromide, these mesoporous Au@Cu_2−x S NPs can passivate surface traps and smooth the valence-band offset at the perovskite/spiro-OMeTAD interface for hole transferring. Furthermore, the improved hole mobility can offer balanced charge transport and prevent the carrier accumulation at interfaces. As a result, the Au@Cu_2−x S(20:10)-based PSCs achieves a champion efficiency over 22%, higher than that of the Au@Cu_2−x S-based device.

中文翻译：

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具有双局域表面等离子体共振和配体调制的介孔 Au@Cu2-x S 核壳纳米颗粒用于钙钛矿太阳能电池的空穴选择性钝化

由于局部表面等离子体共振（LSPR），核壳纳米材料在光学应用中具有迷人的特性。在此，引入具有双重 LSPR 特性的介孔核壳 Au@Cu _{2- x} S 纳米材料来稳定和钝化钙钛矿太阳能电池（PSC）的钙钛矿/螺-OMeTAD 界面。由于 LSPR，Au@Cu _{2− x} S 纳米粒子 (NPs) 有可能增强钙钛矿/螺-OMeTAD 界面处的红外吸收并增强局部电场。介孔 Au@Cu _{2− x}的嵌入 spiro-OMeTAD 层中的 S 可以改善钙钛矿晶粒和 spiro-OMeTAD 之间的接触并形成“桥梁”。在阳离子表面活性剂十六烷基三甲基溴化铵的帮助下，这些介孔 Au@Cu _{2- x} S NPs 可以钝化表面陷阱并平滑钙钛矿/螺-OMeTAD 界面处的价带偏移以进行空穴传输。此外，改进的空穴迁移率可以提供平衡的电荷传输并防止载流子在界面处积累。结果，Au@Cu _{2− x} S(20:10) 基 PSC 实现了超过 22% 的冠军效率，高于 Au@Cu _{2− x} S 基器件的效率。