Rational Tailored Polyfluorosubstituted Amide Molecule for Stabilizing PbI₆ Framework and Inhibiting Ion Migration Toward Highly Efficient and Stable Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 2, 2024

Abstract Perovskite solar cells (PSCs), while highly efficient, face stability challenges that hinder their commercial application. These instability issues mainly arise from the fragile nature of Pb─I bonds in perovskites, which easily break under environmental stresses such as heat and light, leading to breakdown [PbI 6 ] framework irreversible degradation. To address these issues, a multifunctional molecule, N 1 ,N 4 ‐bis(2,3,5,6‐tetrafluoro‐4‐iodophenyl)terephthalamide (FIPh‐A), is designed synthesized enhance perovskite films devices. FIPh‐A molecule possesses carbonyl, amino, iodotetrafluorophenyl groups bind stabilize Pb 2+ ions 4− octahedra structure, preventing ion migration films. The activation energy increases obviously 0.28 eV 0.39 by adding verified experiment results. residual strain also released efficiently introducing into characterized grazing incidence X‐ray diffraction. champion PSC with achieves power conversion efficiency 24.60%. After 500 h continuous illumination (ISOS‐L‐1) 300 thermal aging at 80 °C (ISOS‐D‐2I), PSCs maintained 93% 77% initial efficiency, respectively. results emphasize potential additives overcoming PSCs, thereby facilitating advancement.

Language: Английский

Bidirectional Synergistic Crystallization Strategy for Regulating Growth Kinetics Toward Highly Efficient and Stable Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 5, 2024

Abstract Crystalline quality is paramount for the performance and stability of perovskite films devices. By regulating nucleation growth processes, it possible to significantly enhance crystalline quality. This work introduces a bidirectional synergistic crystallization strategy (BSC strategy) that synchronizes kinetics across both top bottom surfaces film, thereby enhancing film boosting efficiency solar cells (PSCs). Employing time‐resolved optical characterization techniques, demonstrated BSC effectively mitigates dissolution–recrystallization cycle nuclei grains during annealing, accelerates evaporation residual solvents at suppresses void formation buried interface. Depth‐resolved grazing‐incidence wide‐angle scattering analyses further confirm improves promotes oriented growth, minimizes internal strains caused by uneven dynamics. approach results in champion device 24.98%, with low voltage deficit 360 mV. Moreover, markedly enhanced, after 1000 h continuous light exposure, remains over 91% initial value.

Language: Английский