Impact of optically nonuniform luminescence coupling effect to the limiting cell conversion efficiency in InGaP/GaAs/Ge triple junction solar cell
Impact of optically nonuniform luminescence coupling effect to the limiting cell conversion efficiency in InGaP/GaAs/Ge triple junction solar cell
复制标题
InGaP/GaAs/Ge三结太阳能电池中光学非均匀发光耦合效应对限制电池转换效率的影响
DOI：
10.1117/1.jpe.7.035501
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发表时间：
2017
影响因子：
1.7
通讯作者：
Okada Yoshitaka
中科院分区：
文献类型：
--
作者：
Yu Jeco Bernice Mae F.;Sogabe Tomah;Tamaki Ryo;Ahsan Nazmul;Okada Yoshitaka
研究了多结太阳能电池中发光耦合效应空间分布的不均匀性对极限电池转换效率的影响。为此，实验获得了不同中底池LC效率下极限底池的激光束感生电流分布图。最小和最大LC效率分别为8.5%和69%。为了进一步分析测量结果，考虑到LC效应的空间非均匀性，已经开发了一个准二维仿真模型。模拟和测量结果之间的一个很好的协议表明，不均匀的LC电流分布引起的光学现象，如光子逃逸和内反射。这种不均匀性导致极限单元的绝对转换效率在最大LC效率时降低1.35%。这种降低在被抑制时可以产生更高的极限电池转换效率，这进而可以改善总体MJSC转换效率。
The impact of nonuniform spatial distribution of the luminescence coupling (LC) effect to the limiting cell conversion efficiency of multijunction solar cells (MJSCs) has been investigated. For this purpose, the laser beam induced current distribution maps of the limiting bottom cell have been acquired experimentally under varying middle-to-bottom cell LC efficiencies. The minimum and the maximum LC efficiencies demonstrated were 8.5% and 69%, respectively. To further analyze the measurement results, a quasi-two-dimensional simulation model considering the spatially nonuniform nature of the LC effect has been developed. A good agreement between the simulation and the measurement results suggests that the nonuniform LC current distribution is induced by optical phenomena such as photon escape and internal reflection. This nonuniformity then causes the absolute conversion efficiency of the limiting cell to be reduced by 1.35% at maximum LC efficiency. This reduction, when suppressed, can yield higher limiting cell conversion efficiency, which in turn may improve the overall MJSC conversion efficiency.
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