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设计了一种适用于GaInP/GaInAs/Ge多结太阳电池,可在300~1800nm宽光谱范围内实现均匀聚光的菲涅耳透镜。通过实际测试,得到GaInP/GaInAs/Ge多结太阳电池的量子效率图谱和透镜主体材料硅胶的折射率色散曲线,在此基础之上采用多焦点与多设计波长相结合的方法,对菲涅耳透镜进行优化设计。基于该方法建立了几何聚光比为625倍,环距为0.3mm的透镜模型以及聚光效率、均匀性等聚光性能参数的计算模型,并利用蒙特卡罗光线追迹及实验测试的方法对其聚光性能进行分析。研究结果表明,所设计的透镜在300~1800nm宽光谱范围内以及三个子电池的光谱响应波段内都能较好地实现均匀会聚,同时具有较高的聚光效率,聚光分布均匀度高于75%,聚光效率超过80%。
A Fresnel lens designed for GaInP / GaInAs / Ge multijunction solar cells to achieve uniform light collection in the broad spectral range from 300 to 1800 nm was designed. Through the actual test, the quantum efficiency spectra of GaInP / GaInAs / Ge multijunction solar cells and the refractive index dispersion curve of silica gel as the lens main body material were obtained. Based on this, a combination of multifocal and multi- Optimized lens design. Based on this method, a lens model with a geometric condensing ratio of 625 and a ring pitch of 0.3 mm was established, and a calculation model of the condensing performance parameter such as the condensing efficiency and the uniformity was established. By using the method of Monte Carlo ray tracing and experimental testing Its condenser performance analysis. The results show that the designed lens can achieve uniform convergence in the wide spectral range of 300 ~ 1800nm and the spectral response of three sub-cells, and has a high light-gathering efficiency and a higher uniformity of light distribution 75%, condenser efficiency over 80%.