Ultra-lightweight Flexible Perovskite–Perovskite–Organic Triple-Junction Tandem Solar Cells
Year: 2026
Type: preprint
Abstract: Triple-junction photovoltaics offer a promising route to surpass the efficiency limitations of single-junction solar cells, yet existing high-performance architectures are predominantly rigid and relatively heavy, limiting their use in weight-sensitive applications. Here, we report, to the best of our knowledge, the first ultra-lightweight and flexible monolithic perovskiteperovskite–organic triple-junction tandem solar cells. The devices integrate 2.05 eV and 1.62 eV perovskite front and middle subcells with a 1.33 eV organic bulk-heterojunction rear subcell on a 10 μm flexible polyethylene terephthalate substrate. The champion tandem device achieves a power conversion efficiency of 24.1%, with an open-circuit voltage of 3.27 V, a short-circuit current density of 9.32 mA/cm2, and a fill factor of 79.0%, corresponding to a power-per-weight of 11.2 W/g. The device exhibits a stabilized PCE of 24.6% under maximumpower-point tracking and negligible hysteresis between forward and reverse voltage scans. External quantum efficiency measurements yield closely matched integrated photocurrent densities of 9.39, 9.39, and 9.21 mA/cm2 for the three subcells, confirming efficient spectral utilization and current matching. These results establish flexible perovskite–perovskiteorganic triple-junction tandems as a promising platform for high-specific-power photovoltaics and open opportunities for lightweight energy harvesting in aerospace, unmanned aerial vehicles, wearable electronics, and portable power systems.
Source: ChemRxiv
Author: FURKAN H. ISIKGOR
Institution: University of Manchester
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221135482