Sun Mengdi, Kik Pieter G
Opt Express. 2021 Aug 2;29(16):24989-24999. doi: 10.1364/OE.431530.
The angle dependent transmission of light trapping transparent electrodes is investigated. The electrodes consist of triangular metallic wire arrays embedded in a dielectric cover layer. Normal incidence illumination of the structure produces light trapping via total internal reflection, virtually eliminating all shadowing losses. It is found that varying the external angle of incidence can affect the light trapping efficiency η due to partial loss of internal reflection and increased interaction with neighboring wires. Despite these effects, a judicious selection of geometry and materials can reduce shadowing losses by more than 85% over a surprisingly large angular range of 120°. It is demonstrated that the angle-averaged shadowing losses in an encapsulated silicon solar cell under illumination with unpolarized light can be reduced by more than a factor of two for incident angles between -60° and +60° off-normal across the entire AM1.5 solar spectrum.
研究了光捕获透明电极的角度相关传输特性。这些电极由嵌入介电覆盖层的三角形金属线阵列组成。该结构的垂直入射光照通过全内反射产生光捕获，几乎消除了所有阴影损失。研究发现，由于内反射的部分损失以及与相邻金属线相互作用的增加，改变外部入射角会影响光捕获效率η。尽管存在这些影响，但通过明智地选择几何形状和材料，在高达120°的惊人大角度范围内，阴影损失可降低超过85%。结果表明，在整个AM1.5太阳光谱范围内，对于偏离法线-60°至+60°的入射角，封装硅太阳能电池在非偏振光照下的角度平均阴影损失可降低两倍以上。
