菲涅耳透镜下多结电池表面局部高辐射功率对短路电流的影响

为探索以菲涅耳透镜为聚光器的聚光光伏模组中,多结电池中心局部高辐射功率对短路电流的影响,测量菲涅耳透镜的高亮度光斑直径,并据此分别测试室内不同局部光照面积下和户外不同尺寸透镜下的GaInP/GaInAs/Ge三结电池的短路电流,利用电路网络模型分析实验结果。结果表明,短路电流与局部聚光的面积无关；小尺寸菲涅耳透镜聚焦下,沿光轴电流与辐射功率同步变化；透镜尺寸增大到一定程度,电池中心局部承受过高辐射功率,电流受峰值隧穿电流限制,宏观体现为焦平面处短路电流下降。电池放置在焦平面两侧,均可缓解局部高辐射功率,短路电流最高提升 8.0%。

Influence of Local High Radiation on Short-circuit Current of Multi-junction Solar Cell under Fresnel Lens

In order to explore the influence of local high radiation on short-circuit current of multi-junction solar cell in concentrated photovoltaic module with Fresnel lens as the concentrator, the diameters of the high bright spot of Fresnel lens were measured so as to measure the short-circuit current of the GaInP/GaInAs/Ge triple-junction solar cell with different sizes of lens under different local illumination areas. And the experimental results were analyzed by using circuit network model. The results show that the short-circuit current is independent of the area of bright spot, and the current along the optical axis changes synchronously with radiation when the small size Fresnel lens is focused. When the size of lens increases to a certain extent, high radiation presents inthe center of solar cell, and the current is limited by peak tunneling current, which is reflected as the decrease of short-circuit current at the focal plane. Putting the solar cell on both sides of the focal plane canalleviatethe local high radiation, and the short-circuit current can be increased by 8.0%.