光采收利用仿生微织构透明薄膜进行光伏应用

Increasing light absorption through surface textured transparent films is gaining importance in the development of high-efficiency solar cells. However, most of the textured films are produced by replication with imprinting stamps that are fabricated by resource-intensive and expensive lithography-based techniques. In this work, we employed lotus leaves as low-cost imprinting stamps to fabricate large-area transparent polydimethylsiloxane (PDMS) films decorated with micron-scale features. Subsequently, we investigate the optical and light-harvesting properties of those micro-textured PDMS films to improve the efficiency of crystalline silicon solar cells. The combined influence of the anti-reflective SiNx dielectric layer and the laminated PDMS films on solar cells was also examined. The graded refractive index imparted at the air-silicon interface by the textured PDMS films containing micro-posts reduced the reflectance. In those solar cells without the SiNx coating, the lamination of textured PDMS significantly reduced the solar-weighted reflectance by more than 40%, increased short-circuit current density by 6.5% and improved the power conversion efficiency by 10%. However, the textured PDMS films exhibited marginal improvement of power conversion efficiency (1.3%) on SiNx coated crystalline solar cells, although the reduction in solar-weighted reflectance by 30%. We believe that the biomimetic micro-textured PDMS films proposed in this paper prove to be cost-effective candidates for enhancing the light-absorption capacity of highly efficient crystalline silicon solar cells.