Numerical modeling of intermediate band solar cells
Numerical modeling of intermediate band solar cells
复制标题
中波段太阳能电池的数值模拟
DOI：
10.1088/0268-1242/26/1/014031
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发表时间：
2010
影响因子：
1.9
通讯作者：
A. Martí
中科院分区：
文献类型：
--
作者：
I. Tobías;A. Luque;A. Martí
采用计算机模拟的方法分析了中间波段太阳能电池在集中太阳光下的性能。在一维稳态条件下，对电子和空穴的连续性方程和泊松方程进行了数值求解。对于给定密度的中间带中心和光学截面，考虑了两种情况。在第一种情况下，中间带未掺杂，大捕获系数连接传导带和中间带；与传统电池相比，获得了较大的短路电流增强，但代价是高电压和效率下降。在第二种情况下，中间带被掺杂部分填充，与半导体带几乎没有热接触。中间波段概念的潜力在高度集中的照明下实现了显著的效率提高。分析还揭示了平面准费米能级的近似是不合适的。
The performance of intermediate band solar cells under concentrated sunlight is analyzed by means of computer simulation. The continuity equations for electrons and holes and the Poisson equation are numerically solved in one dimension under steady-state conditions. Two situations are considered for a given density of intermediate band centers and optical cross sections. In the first situation, the intermediate band is undoped and a large capture coefficient links conduction and intermediate bands; a large short circuit current enhancement with respect to a conventional cell is obtained, but at the price of strong voltage and efficiency degradation. In the second, the intermediate band is partially filled by doping and there is little thermal contact with the semiconductor bands. The potential of the intermediate band concept is then realized with significant efficiency improvement under highly concentrated illumination. The analysis also reveals that the approximation of flat quasi-Fermi levels is not appropriate.