发光耦合提高多结单色光伏器件的效率
Efficiency Increase in Multijunction Monochromatic Photovoltaic Devices Due to Luminescent Coupling
摘要：
我们提出了一个多结细致平衡模型，其中包括发光耦合，光捕获和非辐射复合的影响，适用于治疗多结太阳能电池和光子功率转换器-光伏器件设计转换窄带光。该模型包括镜面反射和朗伯反射，使用射线光学形式主义和治疗使用内部辐射效率的非辐射过程。使用这个模型，我们计算和优化多结光子功率转换器的效率为一系列的材料质量和光捕获计划。多结器件允许以较低的电流增加电压，减少串联电阻损耗。我们表明，效率显着增加的结的数量，即使没有串联电阻，当设备有一个吸收基板。当装置具有背反射器时，不会发生这种增加。我们解释这种效果使用一个简化的模型，它说明了在衬底上的多结器件的辐射损耗降低的起源。
英文摘要：
We present a multijunction detailed balance model that includes the effects of luminescent coupling, light trapping and nonradiative recombination, suitable for treatment of multijunction solar cells and photonic power converters -- photovoltaic devices designed to convert narrow-band light. The model includes both specular and Lambertian reflections using a ray-optic formalism and treats nonradiative processes using an internal radiative efficiency. Using this model, we calculate and optimize the efficiency of multijunction photonic power converters for a range of material qualities and light-trapping schemes. Multijunction devices allow increased voltage with lower current, decreasing series resistance losses. We show that efficiency increases significantly with increased number of junctions, even without series resistance, when the device has an absorbing substrate. Such an increase does not occur when the device has a back reflector. We explain this effect using a simplified model, which illustrates the origin of the decreased radiative losses in multijunction devices on substrates.
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