Lead-Free, Sn-Based All-Perovskite Tandem Solar Cells with an Efficiency Over 15.

ABSTRACT: Recent advances in tin-based perovskite solar cells (TPSCs) have yielded significant gains in power conversion efficiency (PCE), yet progress on wide-bandgap (WBG) tin perovskites remains limited, primarily due to the complexities of halogen composition tuning and the associated phase segregation. Here, a halogen composition-independent strategy is presented for realizing WBG TPSCs by partially substituting formamidinium with dimethylammonium (DMA) in the A-site of the perovskite lattice. This substitution expands the lattice, widening the bandgap from 1.63 to 1.72 eV without requiring additional bromine. Comprehensive structural and optical analyses reveal enhanced crystallinity, reduced strain, and improved film morphology. Furthermore, ultraviolet photoelectron spectroscopy confirms enh

SUBMITTER: Yoon S 

PROVIDER: S-EPMC12632427 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature