Xu Qiwei, Meng Lingju, Wang Xihua
Appl Opt. 2019 Apr 1;58(10):2505-2511. doi: 10.1364/AO.58.002505.
Gridline shadowing is one of the main factors affecting the performance of silicon solar cells. In this demonstration, a straightforward, scalable approach is reported to reduce shadowing losses from metallic contacts on silicon solar cells by employing cellulose nanocrystals (CNC) mixed in a polymer- polydimethylsiloxane. The method is highly compatible with current solar cell module manufacturing. The CNC:polymer (CNP) hybrid diffusers, offering highly efficient broadband light diffusion, are applied atop the metallization areas to deflect the light impinging on metallic gridlines toward uncovered active areas on the solar cell. Simulations showed that the CNP diffuser is an excellent candidate for reducing shadowing losses within a wide range of incident angles, as it can reduce more than 30% of shadowing losses at normal incidence, and nearly 50% of the lost light can be recycled at the incident angle of 60°. Taking advantage of reduced shadowing losses, a new 6-busbar technology based on the CNP diffusers is proposed with lower manufacturing complexity and higher overall efficiency.
网格线阴影是影响硅太阳能电池性能的主要因素之一。在本演示中，报道了一种直接、可扩展的方法，通过在聚合物聚二甲基硅氧烷中混合纤维素纳米晶体（CNC）来减少硅太阳能电池上金属接触产生的阴影损失。该方法与当前太阳能电池组件制造高度兼容。提供高效宽带光扩散的CNC：聚合物（CNP）混合漫射器被应用于金属化区域之上，以将照射在金属网格线上的光偏转到太阳能电池上未覆盖的有源区域。模拟表明，CNP漫射器是在很宽的入射角范围内减少阴影损失的极佳候选者，因为它在垂直入射时可减少超过30%的阴影损失，在60°入射角时近50%的损失光可以被回收利用。利用减少的阴影损失，提出了一种基于CNP漫射器的新型6母线技术，其制造复杂度更低且整体效率更高。
