Lithium and sodium ion Co-doping: A promising strategy for enhancing the performance of Cs₂AgBiBr₆ perovskite solar cells

Release time:2024-12-24 Hits:

Key Words:ORGANOMETAL HALIDE PEROVSKITES; EFFICIENCY; BISMUTH; CATIONS

Abstract:The non-toxic perovskite Cs2AgBiBr6 presents impressive photovoltaic performance and stability, offering a lead halide-free alternative for solar cells. Overcoming challenges related to thin-film preparation and its intrinsic indirect bandgap, we leverage the synergistic effect of co-doping with lithium ions (Li+) and sodium ions (Na+) to enhance perovskite solar cells (PSCs). Improved carrier transport in Cs2AgBiBr6 films, facilitated by the diffusion of Li+, significantly enhances the photovoltaic conversion efficiency (PCE). Systematic exploration of various doping ratios identifies the optimal co-doping ratio, resulting in a remarkable PCE increase to 5.02 % and a short-circuit current of 6.56 mA cm-2. Ion doping not only tunes the material's band gap but also adjusts the energy level arrangement within the device layers. Impressively, the PCE of co-doped PSCs experiences only a 16.8 % decline after 60 days in an unencapsulated environment, underscoring its outstanding stability. This work provides a rational design for double-ion co-doping experiments, enhancing PSC performance and offering valuable insights for the future development of PSCs.

Volume:1010

Issue:

Translation or Not:no