通过“抗反射”双势垒结构实现卓越的热电性能
Superior thermoelectric performance via "anti-reflection" enabled double-barrier structures
摘要：
我们从理论上证明使用原子非平衡格林函数形式主义，包括自洽充电，设计一个优越的热电发电机的基础上的“抗反射”涂层双势垒共振隧穿二极管。与典型的双势垒器件不同，我们表明，使抗反射设计有利于在其透射光谱中的“矩形波”型特征，这显着提高了热电性能。它表明，该设备的最佳工作制度提供了一个最大的功率范围内的$0.7$到$0.9 MW/m^{2}$的效率范围从$46$到$54\%$的卡诺效率。在弹道操作制度中的电荷和热传输的物理学帮助我们获得更多的见解，大量的横向载流模式如何提高输出功率，同时如何减少高能量寄生电流的影响，帮助提高效率。最后，与传统的双势垒热电的标准性能参数，这清楚地揭示了性能的好处，使抗反射涂层的比较研究。
英文摘要：
We demonstrate theoretically using the atomistic non-equilibrium Green's function formalism with the inclusion of self-consistent charging, the design of a superior thermoelectric generator based on an "anti-reflection" coated double barrier resonant tunnelling diode. Unlike a typical double barrier device, we show that enabling the anti-reflection design facilitates a "boxcar" type feature in its transmission spectrum, which significantly enhances the thermoelectric performance. It is demonstrated that the best operating regime of this device offers a maximum power in the range of $0.7$ to $0.9 MW/m^{2}$ at efficiencies ranging from $46$ to $54\%$ of Carnot efficiency. The physics of charge and heat transport in the ballistic regime of operation helps us gain additional insights on how a large number of transverse current carrying modes boost the output power and simultaneously how the diminishing effects of high-energy parasitic currents aid the efficiency. Finally, a comparative study with a conventional double barrier thermoelectric is presented in terms of standard performance parameters which clearly reveals the performance benefits of enabling an anti-reflection coating.
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