Sodium-Doped Improved Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Solar Cells

通过控制Na+的掺杂浓度，成功制备出微孔密度显著降低的钙钛矿薄膜，这一进步有效抑制了材料中的缺陷状态。我们构建了一种无HTML碳基PSC结构，其中Cs2AgBiBr6薄膜作为核心吸光材料。研究发现，适量的Na+替代Cs+不仅优化了Cs2AgBiBr6薄膜的形貌质量，薄膜的光吸收能力也显著增强。数据显示，当Na+掺杂比例为5%时，所制备的Cs2AgBiBr6碳基PSC展现出了最优性能，其PCE达到了0.85%，相较于未掺杂Na+的对照组，效率提升了约39%。By controlling the doping concentration of Na+, perovskite films with significantly reduced micropore density were successfully prepared, which effectively suppressed the defect state in the materials. We constructed an HTML free carbon based PSC structure with Cs2AgBiBr6 film as the core light absorbing material. It was found that the appropriate amount of Na+ instead of CS+ not only optimized the morphology and quality of Cs2AgBiBr6 film, but also significantly enhanced the optical absorption capacity of the film. The test data showed that when the Na+ doping ratio was 5%, the Cs2AgBiBr6 carbon based PSC showed the best performance, and its PCE reached 0.85%, which was about 39% higher than that of the control group without Na+.