Work

High-efficiency lead-free all-perovskite tandem solar cells achieving 28.22 % power conversion efficiency: A Cs2AgBi0.75Sb0.25Br6/FASnI3 heterostructure design

Year: 2025

Type: article

Abstract: This research looks at how well an all-perovskite, lead-free tandem solar cell works. It has a wide-bandgap (1.8 eV) Cs 2 AgBi 0 . 75 Sb 0 . 25 Br 6 top subcell and a narrow-bandgap (1.41 eV) FASnI 3 bottom subcell. We show a very efficient device design by carefully adjusting the thicknesses of the absorber layers (600 nm for the top cell and 500 nm for the bottom cell) and the charge transport layers (TiO 2 as ETL and Cu 2 O as HTL). Numerical simulations using SCAPS-1D under AM1.5G light show that the best power conversion efficiency (PCE) achieved is 28.22 %, along with a very satisfactory fill factor (88.74 %), short-circuit current density (27.886 mA/cm 2 ), and Open-circuit voltage (1.1402 V) at 300 K. The optimized structure (FTO/TiO 2 /Cs 2 AgBi 0 . 75 Sb 0 . 25 Br 6 /FASnI 3 /Cu 2 O) highlights the synergistic potential of these lead-free perovskites in tandem configurations. These results not only advance the development of environmentally friendly photovoltaics but also pave the way for scalable, high-performance tandem solar cells that rival their lead-based counterparts.

Source: Results in Optics

DOI: 10.1016/j.rio.2025.100882

Authors: Sarowr Basm Almahsen, Ghaleb Ali Al-Dahash

Institution: University of Babylon

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $1,470