Design of Biomimetic Leaf-type Hierarchical Nanostructure for Enhancing the Solar Energy Harvesting of Ultra-thin Perovskite Solar Cells

Huaxu Liang 1,2

Xinping Zhang 2

Bo Lin 2

Fuqiang Wang 1, 2,*,Email

Ziming Cheng 1,2

Xuhang Shi 1,2

Bachirou Guene Lougou1

 

 

1School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, China

2School of New Energy, Harbin Institute of Technology at Weihai, 2, West Wenhua Road, Weihai 264209, China

Abstract

Ultra-thin perovskite solar cells have the advantages of low cost, high efficiency and flexibility, and have significant potential applications. However, a severe optical loss is often observed in the ultra-thin perovskite solar cell due to the insufficient light absorption. In this study, inspired by the efficient light harvesting of hierarchical structure in leaf, a biomimetic leaf-type hierarchical nanostructure was introduced for designing highly efficient ultra-thin perovskite solar cells. In detail, three layers of hexagonal arrays of silica nanoparticles with different radius were used to construct the biomimetic leaf-type hierarchical structure. The biomimetic leaf-type hierarchical nanostructure was optimized by a finite-difference time-domain method combined with a particle swarm optimization algorithm to reduce the light reflection and increase the light absorption of the ultra-thin perovskite solar cells. The results indicated that the biomimetic leaf-type hierarchical nanostructure could enhance the light absorption of ultra-thin perovskite solar cells by maximum 39% at the long wavelength. The photocurrent of the perovskite solar cells with a biomimetic leaf-type hierarchical nanostructure was 8.4% higher than that of perovskite solar cells without a biomimetic leaf-type hierarchical nanostructure.

Design of Biomimetic Leaf-type Hierarchical Nanostructure for Enhancing the Solar Energy Harvesting of Ultra-thin Perovskite Solar Cells