通过斜角沉积法生长高度各向异性的金属卤化物钙钛矿纳米壁
Highly anisotropic organometal halide perovskite nanowalls grown by Glancing Angle Deposition
AI总结：
通过斜角沉积法制造高度各向异性的MAPI钙钛矿纳米壁，实现强各向异性光学性能及偏振敏感响应，为新型光电设备发展奠定基础。
摘要：
偏振器是日常使用中的光电设备中的常见组件，如显示器、光学传感器或摄影相机等。然而，对光偏振的控制仍然是一个未解决的挑战，因为当前显示技术的主要缺点在于显著的光学损耗。在此背景下，金属卤化物钙钛矿因其灵活的合成和可设计的光学性质而发挥决定性作用。因此，鉴于其卓越的电学性能，混合钙钛矿已成为光伏和光电应用中的首选材料。在不同的金属卤化物钙钛矿纳米结构中，纳米线和纳米棒最近已成为控制光偏振用于照明或探测应用的关键因素。本文将展示通过在高真空下斜角沉积PbI2，随后在直角下沉积CH3NH3I，实现了前所未有的高度对齐和各向异性的甲基铵铅碘（MAPI）钙钛矿纳米壁的制造。我们的方法提供了一种在任何基板上直接制造钙钛矿纳米结构的途径，包括在光伏设备上。钙钛矿纳米壁的无与伦比的对齐度提供了强各向异性光学性质，如光吸收和光致发光，后者具有最大偏振比P=0.43。此外，将MAPI纳米壁应用于光伏设备使其具有偏振敏感响应，当用太阳光谱的近红外范围（>700nm）照射时，最大光电流差异为2.1%。我们的简便真空基方法在开发新一代偏振敏感的钙钛矿基光电设备如照明设备或自供电光探测器中具有里程碑意义。
英文摘要：
Polarizers are ubiquitous components in optoelectronic devices of daily use as displays, optical sensors or photographic cameras, among others. Yet the control over light polarization is an unresolved challenge as the main drawback of the current display technologies relays in significant optical losses. In such a context, organometal halide perovskites can play a decisive role given their flexible synthesis with under design optical properties . Therefore, along with their outstanding electrical properties have elevated hybrid perovskites as the material of choice in photovoltaics and optoelectronics. Among the different organometal halide perovskite nanostructures, nanowires and nanorods have lately arise as key players for the control of light polarization for lighting or detector applications. Herein, we will present the unprecedented fabrication of highly aligned and anisotropic methylammonium lead iodide (MAPI) perovskite nanowalls by Glancing Angle Deposition of PbI2 under high vacuum followed by CH3NH3I deposition at normal angle. Our approach offers a direct route for the fabrication of perovskite nanostructures virtually on any substrate, including on photovoltaic devices. The unparalleled alignment degree of the perovskite nanowalls provides the samples with strong anisotropic optical properties such as light absorption and photoluminescence, the latter with a maximum polarization ratio of P=0.43. Furthermore, the implementation of the MAPI nanowalls in photovoltaic devices provides them with a polarization-sensitive response, with a maximum photocurrent difference of 2.1 % when illuminating with the near-infrared range of the solar spectrum (>700 nm). Our facile vacuum-based approach embodies a milestone in the development of last generation polarization-sensitive perovskite-based optoelectronic devices such as lighting appliances or self-powered photodetectors.
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