具有高效等离子体效应的Au@Ag纳米棒的可控制备及其光伏增强效应研究

提高太阳能电池光电转化效率是高效利用太阳能的必然要求，利用Au、Ag的等离子体效应（LSP）是提高太阳能电池光电转化效率的有效方法。然而，高效光吸收增强型钙钛矿太阳能电池（PSCs）的开发一直受传统结构等离子体光学特性的限制。本项目拟开发强吸收、LSP响应波长可调的Au@Ag核壳结构纳米棒，解决传统结构等离子体材料吸光特性与钙钛矿吸收光谱不匹配的难题，实现PSCs对入射光的强化利用，大幅度提高PSCs的效率。通过结构表征与理论模拟，揭示Au@Ag制备条件-结构-性能间的作用规律和相关理论，实现具有设定光学特性的Au@Ag的可控制备；通过电极结构设计和理论计算，深入揭示等离子体粒子在PSCs中的作用机制和机理，提出利用等离子体光调控法构建高性能PSCs的技术原理。本项目的实施将为高效等离子体纳米材料的构效关系研究及其光伏增强效应奠定一定的理论基础，对其它光响应器件的开发具有参考价值。

It is of great importance to promote the power conversion efficiency of a solar cell for converting solar energy into electricity more efficiently. Due to the localized surface plasmons (LSP) resonance, the Au and Ag nanoparticles demonstrate themselves as one of the most important approaches to promote the light harvesting efficiency (LHE) and improve the efficiency of the solar cells. However, constructing of plasma incorporated and LHE enhanced perovskite solar cells (PSCs) is still a big challenge, owing to the limitation of the optical nature of the conventional plasmonic particles with simple spherical structure. In this project, novel plasmonic Au@Ag core-shell nanorods with wideband, strong and adjustable absorbance are proposed to enhance the sunlight, especially the part with low energy, harvesting efficiency and improve the PSCs efficiency remarkably. Efforts will be devoted to carefully studying the fabrication conditions, the microstructures, the optic properties and the simulated LSP effects of the obtained Au@Ag materials. Thus, the interaction law and the some theoretical principles regarding to the relationship between the fabrication, structure and properties will be established and employed, in return, to direct the fabrication of Au@Ag core-shell nanorods with desired performance. Meanwhile, various architectures of Au@Ag incorporated devices will be investigated both experimentally and theoretically to study how the Au@Ag affects the light-absorption behavior of the perovskite photoanode and power conversion efficiency of the PSCs devices. The working principle and mechanism of the plasmonic materials in the PSCs devices will thus be clarified and a technical route for constructing plasma enhanced PSCs will also be concluded. The achievement of the proposed project is of significance to provide new ideas and guidance of synthesizing excellent plasma materials and their enhancement effects in photovoltaic.