标题： 基于准二维 Ruddlesden-Popper 混合卤素钙钛矿纳米材料的高性能光电探测器 显示英文标题

标题： Towards high-performance photodetectors based on quasi-2D Ruddlesden-Popper mixed-n perovskite nanomaterials

摘要： 准二维金属卤化物钙钛矿优异的光电性能、简便的合成方法和稳定的材料特性，使其成为光电设备的热门研究课题。 在层状有机-无机钙钛矿中，光电性能受到形貌和量子限制的显著影响，这对于它们的光检测性能至关重要，并提供了一种优秀的可调工具。 在这里，我们研究了通过胶体热注入技术制备的三种不同形貌的准二维甲基铵铅溴钙钛矿的光电性能和光检测性能，包括纳米片、纳米片和纳米条纹。 结构和光学表征揭示了具有不同限制程度的混合n相。 我们的研究表明，具有弱限制效应的纳米条纹表现出优越的光检测性能。 它们表现出最高的光响应度、外部量子效率和探测率分别为183 mA/W、56%和2.9*10^11 Jones。 与纳米片和纳米片相比，它们还表现出最高的开/关比和最快的光响应（tau_r=3.4 ms和tau_f=4.3 ms）。 我们的研究将有助于实现基于准二维钙钛矿纳米颗粒的低成本高性能光电探测器。 显示英文摘要

摘要： The excellent optoelectronic properties, straightforward synthesis, and robust material stability of quasi-2D metal halide perovskites have made them a hot research topic for optoelectronic devices. In layered organic-inorganic perovskites, the optoelectronic properties are greatly influenced by morphology and quantum confinement, which are crucial for their photodetection performance and offer an excellent tunability tool. Here we investigated the optoelectronic properties and photodetection performance of quasi-2D methylammonium lead bromide perovskites with three different morphologies nanoplatelets, nanosheets, and nanostripes produced by colloidal hot injection technique. The structural and optical characterization reveals the mixed-n phases with varying extents of confinement. Our study shows that nanostripes with the weak confinement effect exhibit superior photodetection performance. They demonstrate highest photoresponsivity, EQE, and detectivity of 183 mA/W, 56 % and 2.9*10^11 Jones respectively. They also show the highest on/off ratio and fastest photoresponse (tau_r=3.4 ms and tau_f=4.3 ms) in comparison to nanoplatelets and nanosheets. Our study will aid in realizing an inexpensive high-performance photodetector based on nanoparticles of quasi-2D perovskites.