Detailed balance analysis of nanophotonic solar cells.
Detailed balance analysis of nanophotonic solar cells.
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DOI：
10.1364/oe.21.001209
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发表时间：
2013-01
期刊：
影响因子：
3.8
通讯作者：
S. Sandhu;Zongfu Yu;S. Fan
中科院分区：
文献类型：
--
作者：
S. Sandhu;Zongfu Yu;S. Fan
我们提出了一个详细的平衡为基础的方法进行纳米光子太阳能电池的电流密度-电压特性建模。这种方法考虑了固有的材料非理想性，并且对于确定给定结构的太阳能电池效率的理论极限是有用的。我们的方法只需要细胞在所有角度的吸收光谱，这可以很容易地使用现有的模拟工具计算。使用这种方法，我们阐明了物理的开路电压增强散装电池在纳米级薄膜结构，通过显示的增强与吸收抑制在带隙以上的直接光谱区域。我们还表明，通过适当的设计，在纳米级薄膜上使用光栅可以增加其短路电流，同时保持其电压增强能力。
We present a detailed balance based approach for performing current density-voltage characteristic modeling of nanophotonic solar cells. This approach takes into account the intrinsic material non-idealities, and is useful for determining the theoretical limit of solar cell efficiency for a given structure. Our approach only requires the cell's absorption spectra over all angles, which can be readily calculated using available simulation tools. Using this approach, we elucidate the physics of open-circuit voltage enhancement over bulk cells in nanoscale thin film structures, by showing that the enhancement is related to the absorption suppression in the immediate spectral region above the bandgap. We also show that with proper design, the use of a grating on a nanoscale thin film can increase its short-circuit current, while preserving its voltage-enhancing capabilities.