Key Findings
The textured rounded-cone hemispherical solar cell demonstrated superior performance across incidence angles from 0° to 50°, achieving an average short-circuit current density of 25.47 mA/cm² and an average maximum power output of 28.25 mW/cm². Light absorption for this design exceeded 95%. In comparison, the smooth hemispherical cell reached 24.03 mA/cm² and the planar device reached 22.52 mA/cm² for average short-circuit current density.
Technical Details
The research team modeled five distinct architectures: planar, nanowire, smooth hemispherical, and hemispherical structures featuring either rounded-cone or textured rounded-cone front surfaces. The device stack consists of the following layers:
- Indium tin oxide (ITO) electrode
- Phenyl-C61-butyric acid methyl ester (PCBM) electron transport layer
- Methylammonium lead iodide (CH₃NH₃PbI₃) perovskite absorber
- Nickel oxide (NiO) hole transport layer
- Silver (Ag) rear electrode
Using Lumerical software, the team simulated light absorption, scattering, electromagnetic fields, and charge generation for wavelengths between 300 nm and 800 nm. These profiles were integrated into electrical simulations to analyze carrier transport, recombination, and current-voltage characteristics.
Background and Context
While perovskite solar cells are noted for low manufacturing costs and high power conversion efficiency, conventional planar designs suffer from optical losses when the solar incidence angle varies. This leads to power fluctuations that compromise practical energy yields. The proposed hemispherical geometry is designed to enable radial charge collection, while the textured surface scatters incoming light to promote uniform charge generation.
Significance and Outlook
The study, published in Solar Energy by scientists from the Chinese Academy of Sciences and Jilin Normal University, concludes that the three-dimensional hemisphere symmetry balances carrier transport. Furthermore, the use of Mie resonances within the perovskite shell ensures efficient light trapping, effectively overcoming the challenge of angular-dependent power output.
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