Optimal Filling of the Intermediate Band in Idealized Intermediate-Band Solar Cells
Optimal Filling of the Intermediate Band in Idealized Intermediate-Band Solar Cells
复制标题
理想中能带太阳能电池中能带的最佳填充
DOI：
10.1109/ted.2011.2155659
复制
发表时间：
2011
影响因子：
3.1
通讯作者：
T. Reenaas
中科院分区：
文献类型：
--
作者：
R. Strandberg;T. Reenaas
研究了IB太阳电池中间带的最佳填充问题。基于详细平衡原理的模型表明，最佳填充随子带隙的大小、单元的吸收率、吸收系数之间的重叠程度以及子带隙上跃迁的吸收截面的相互大小而变化。文中还给出了非最佳填充对电池效率影响的计算结果。在某些情况下，偏离最佳灌装只会导致效率的微小变化。然而，由于非最佳填充而导致效率显著降低的情况也被识别出来。在某些情况下，非最佳填充的负面影响可以通过增加电池的吸收率来减少，或者当光填充的效果显著时，可以通过增加光浓度来减少。
The optimal filling of the intermediate band (IB) of an IB solar cell is investigated. Using models based on detailed balance principles, it is shown that the optimal filling varies with the size of the subband gaps, the absorptivity of the cell, and the degree of the overlap between the absorption coefficients as well as the mutual sizes of the absorption cross sections for transitions over the subband gaps. The results of calculations that show how nonoptimal filling affects the cell efficiency are also presented. In several cases, a deviation from the optimal filling will only result in small changes in the efficiency. However, cases where the efficiency is reduced dramatically due to nonoptimal filling are also identified. For some cases, the negative impact of nonoptimal filling can be reduced by increasing the absorptivity of the cell or, when the effect of photofilling is significant, by increasing the light concentration.