Cs_(2)(Ag∶Cu)BiBr_(6)双钙钛矿太阳能电池

Cs_(2)(Ag∶Cu)BiBr_(6) Double Perovskite Solar Cells

采用水热法合成了Cu^(+)掺杂的Cs_(2)AgBiBr_(6)双钙钛矿并基于其制备了太阳能电池。通过紫外-可见光吸收光谱、荧光发射光谱、X射线光电子能谱、单色光量子效率光谱及光电流-电压曲线等手段对其光电性能进行探究。研究发现,Cu^(+)掺杂能够显著增强Cs_(2)AgBiBr_(6)粉末样品的光学吸收,但对于薄膜样品几乎没有效果,这是由于Cu相双钙钛矿在溶于二甲基亚砜的过程中会发生分解。实验结果表明,当Cu^(+)掺杂量较低时,太阳能电池的光电转化效率显著提升,这是由于Cu^(+)掺杂对Cs_(2)AgBiBr_(6)薄膜结晶过程的调控作用,微量Cu^(+)掺杂能够显著降低钙钛矿薄膜的缺陷态密度。最终,基于Cu^(+)掺杂的太阳能电池获得了最高1.93%的能量转化效率。

Cu^(+)doped Cs_(2)AgBiBr_(6) double perovskite was synthesized by hydrothermal method and solar cells were fabricated based on this material.Optoelectronic properties were explored by ultraviolet-visible spectroscopy,fluorescence emission spectroscopy,X-ray photoelectron spectroscopy,incident photon-to-electron efficiency,photocurrent-voltage curves.We found that Cu^(+)doping can significantly enhance the optical absorption of Cs_(2)AgBiBr_(6) powder samples,but has almost no effect on Cs_(2)AgBiBr_(6) films,which can be attributed to the decomposition of Cu phase perovskite during the process of dissolving in dimethyl sulfoxide.The experimental results show that when the Cu^(+)doping amount is low,the photoelectric conversion efficiency of solar cells is significantly improved.This is due to the regulatory effect of Cu^(+)doping on the crystallization process of Cs_(2)AgBiBr_(6) thin films,and the defect density of perovskite thin films can be efficiently reduced by Cu^(+)doping.In the end,solar cells based on Cu^(+)doping achieved a maximum power conversion efficiency of 1.93%.