Antireflective nanotextures for monolithic perovskite-silicon tandem solar cells

TL;DR

This paper investigates how hexagonal sinusoidal nanotextures improve the reflective properties and current density utilization of perovskite-silicon tandem solar cells, using finite element method simulations to optimize design parameters.

Contribution

It provides detailed numerical validation, convergence analysis, and comparison of nanotexture configurations, advancing the understanding of nanotexture effects on solar cell performance.

Findings

Nanotextures increase current density utilization from 91% to 98%.

Validation of the Tiedje-Yablonovitch limit assumption.

Optimal nanotexture parameters identified for maximum efficiency.

Abstract

Recently, we studied the effect of hexagonal sinusoidal textures on the reflective properties of perovskite-silicon tandem solar cells using the finite element method (FEM). We saw that such nanotextures, applied to the perovskite top cell, can strongly increase the current density utilization from 91% for the optimized planar reference to 98% for the best nanotextured device (period 500 nm and peak-to-valley height 500~nm), where 100% refers to the Tiedje-Yablonovitch limit. In this manuscript we elaborate on some numerical details of that work: we validate an assumption based on the Tiedje-Yablonovitch limit, we present a convergence study for simulations with the finite-element method, and we compare different configurations for sinusoidal nanotextures.