优化法布里-珀罗腔设计的纳米级热电发电机
Optimized Fabry-Pérot cavity engineered nanoscale thermoelectric generators
摘要：
在这项工作中，我们的目标是设计一个异质结构的纳米热电发电机，可以最大限度地提高废热转换效率在给定的输出功率。为此要实现的主要目标是实现矩形波串形（带通）电子传输函数（R。S. Whitney，Phys. Rev. Lett. 112，130601（2014））。为了实现这一目标，我们提出了在中心共振隧穿结构上使用光学法布里-珀罗腔的电子模拟。我们进一步探索最佳设计的可能性，通过改变腔壁的几何形状，以确保一个近乎完美的电子带通能量过滤。根据我们的研究结果，我们提出了一个通用的设计准则，以实现这种传输，并证明这种设备可以是优秀的热电发电机相比，现有的建议，在提高输出功率，而没有成本的效率。理论上证明，使用非平衡格林函数技术加上自洽充电效应，最大输出功率的增强高达$116\%$，可以通过该方案在$10\%$更高的效率相比，基于共振隧穿的设备。此外，一个详细的线性响应参数的比较研究，也提出和解释的物理传输特性。这项研究提出了一种改进的热电发电机的最佳设备设计策略，并通过传输线形工程促进了一类新的热电发电机的阶段。
英文摘要：
In this work, we aim to design a heterostructure based nanoscale thermoelectric generator that can maximize the waste-heat conversion efficiency at a given output power. The primary objective to be achieved for this is to realize a boxcar-shaped (bandpass) electronic transmission function (R. S. Whitney, Phys. Rev. Lett. 112, 130601 (2014)). In order to achieve that, we propose the use of an electronic analog of optical Fabry-Pérot cavity over a central resonant tunneling structure. We further explore the optimum design possibilities by varying the geometry of the cavity wall to ensure a nearly perfect bandpass energy filtering of electrons. Based on our findings, we propose a general design guideline to realize such transmission and demonstrate that such devices can be excellent thermoelectric generators compared to the existing proposals in terms of boosting the output power without a cost in efficiency. It is theoretically demonstrated using the non-equilibrium Green's function technique coupled with self-consistent charging effects that an enhancement in the maximum output power up to $116\%$ can be achieved through this scheme at a $10\%$ higher efficiency as compared to resonant tunneling based devices. Furthermore, an elaborate comparative study of the linear response parameters is also presented and explained in terms of the physical transport properties. This study suggests an optimal device design strategy for an improved thermoelectric generator and sets the stage for a new class of thermoelectric generators facilitated via transmission lineshape engineering.
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