论文标题
等离子体金属中的费米表面各向异性增加了有效的热载体提取的潜力
Fermi surface anisotropy in plasmonic metals increases the potential for efficient hot carrier extraction
论文作者
论文摘要
实现等离子热载体收获的潜在能量转化和光电检测需要新的材料，可以在金属内的能量放松之前解决提取载体的瓶颈。使用第一原理计算光响应和载体传输特性，我们表明，具有费米速度的定向导体主要限制在一个或两个方向上，具有有效的热载体收获的显着优势。我们表明，类似胶片的导体，PTCOO $ _2 $和Cr $ _2 $ alc的光学响应类似于2D金属，而类似电线的导体，COSN和YCO $ _3 $ _3 $ _3 $ _2 $的光学响应，类似于1D金属的光学响应，与1D金属相似，在高模式的限制性和高度收集中，同时还可以与小型材料进行高效的材料。这些材料中的运输寿命和运输距离，尤其是PTCOO $ _2 $和COSN中的运输距离，与贵金属具有竞争力。最重要的是，我们预测，由于与金属表面平行的载流速度的小部分，所有这些材料对半导体的载体注入效率可能会超过10％，从而在典型的小于0.1％的贵金属注入效率的情况下显着提高，而贵金属从贵金属到半导体。
Realizing the potential of plasmonic hot carrier harvesting for energy conversion and photodetection requires new materials that resolve the bottleneck of extracting carriers prior to energy relaxation within the metal. Using first-principles calculations of optical response and carrier transport properties, we show that directional conductors with Fermi velocities restricted predominantly to one or two directions present significant advantages for efficient hot carrier harvesting. We show that the optical response of film-like conductors, PtCoO$_2$ and Cr$_2$AlC, resemble that of 2D metals, while that of wire-like conductors, CoSn and YCo$_3$B$_2$, resemble that of 1D metals, which can lead to high mode confinement and efficient light collection in small dimensions, while still working with 3D materials with high carrier densities. Carrier lifetimes and transport distances in these materials, especially in PtCoO$_2$ and CoSn, are competitive with noble metals. Most importantly, we predict that carrier injection efficiency from all of these materials into semiconductors can exceed 10% due to the small component of carrier velocity parallel to the metal surface, substantially improving upon the typical less than 0.1% injection efficiency from noble metals into semiconductors.
