Comparing the performance of thermophotovoltaic (TPV) devices is challenging due to a lack of standard operation conditions. Here, we propose a universal figure of merit (FOM) that can be used to evaluate the performance of TPV devices that operate in the far-field regime relative to their thermodynamic bounds. The introduced FOM alleviates temperature dependence and accounts for the fundamental trade-off between power density and efficiency. Based on this FOM, we present a classification of TPV performances reported in recent experiments.

中文翻译：

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热光伏发电的热力学品质因数

由于缺乏标准操作条件，比较热光伏 (TPV) 器件的性能具有挑战性。在这里，我们提出了一个通用品质因数 (FOM)，可用于评估在远场区域运行的 TPV 器件相对于其热力学边界的性能。引入的 FOM 减轻了温度依赖性，并解决了功率密度和效率之间的基本权衡。基于此 FOM，我们对最近实验中报告的 TPV 性能进行了分类。