热光伏和热辐射电池中的电荷和辐射耦合输运过程
Coupled Charge and Radiation Transport Processes in Thermophotovoltaic and Thermoradiative Cells
摘要：
电荷输运以及热辐射和发光辐射的精确建模对于理解和设计辐射热能转换器至关重要。半导体中的载流子动力学可以用泊松-漂移-扩散方程很好地描述，而发射极/吸收极结构中的热辐射可以用多层涨落电动力学计算。这两种类型的能量流通过辐射吸收/发光和载流子产生/复合而相互作用。然而，过去的研究通常仅假设有限的相互作用，将热辐射吸收作为载流子模型的输入来预测器件性能。为了检验这一假设，我们开发了一个完全耦合的半导体器件中的电荷和辐射输运的迭代模型，我们用我们的模型来分析近场和远场GaSb热光伏和热辐射系统。通过比较我们的结果与过去的方法，不考虑电荷和辐射传输之间的交叉影响，我们发现，一个完全耦合的方法是必要的，以准确地模拟光子回收和近场增强外部发光。由于这些影响可以大大改变设备的性能，我们的建模方法可以帮助设计高效的热光伏和热辐射系统。
英文摘要：
Accurate modeling of charge transport and both thermal and luminescent radiation is crucial to the understanding and design of radiative thermal energy converters. Charge carrier dynamics in semiconductors are well-described by the Poisson-drift-diffusion equations, and thermal radiation in emitter/absorber structures can be computed using multilayer fluctuational electrodynamics. These two types of energy flows interact through radiation absorption/luminescence and charge carrier generation/recombination. However, past research has typically only assumed limited interaction, with thermal radiation absorption as an input for charge carrier models to predict device performance. To examine this assumption, we develop a fully-coupled iterative model of charge and radiation transport in semiconductor devices, and we use our model to analyze near-field and far-field GaSb thermophotovoltaic and thermoradiative systems. By comparing our results to past methods that do not consider cross-influences between charge and radiation transport, we find that a fully-coupled approach is necessary to accurately model photon recycling and near-field enhancement of external luminescence. Because these effects can substantially alter device performance, our modeling approach can aid in the design of efficient thermophotovoltaic and thermoradiative systems.
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