Mixed halide perovskites with chlorine (Cl) content have received significant interest due to better charge transport properties and longer diffusion length compared to pure iodine-based perovskites. The superior properties of Cl-doped perovskites improve solar cell device performance, although the quantification of Cl composition in the perovskite films remain difficult to achieve. Hence, it is difficult to correlate the Cl-quantity with the improved device performance. In this work, we deposited Cl-doped perovskite films through a facile three- and two-step sequential chemical vapor deposition (CVD) where lead halide films were deposited in the first steps of the process and subsequently converted to perovskites. No Cl substitution by iodine was observed during a sequential deposition of lead chloride and lead iodide films which reacted to form a lead chloride iodide phase (PbICl). The substitution of Cl by iodine ions only occurred during the conversion to perovskite phase. Large perovskite grains (greater than 2 µm) were realized when converting a PbI₂ film to perovskite compared to chlorine containing lead halide films, contradicting literature. However, Cl doped perovskite solar cells showed improved device efficiencies as high as 10.87% compared to an un-doped perovskite solar cell (8.76%).

具有氯（Cl）含量的混合卤化物钙钛矿与纯碘基钙钛矿相比具有更好的电荷传输性能和更长的扩散长度，因此受到了广泛的关注。尽管仍难以实现钙钛矿膜中Cl成分的定量，但掺Cl的钙钛矿的优越性能提高了太阳能电池的性能。因此，难以将Cl量与改善的器件性能相关联。在这项工作中，我们通过简便的三步和两步顺序化学气相沉积（CVD）沉积了掺Cl的钙钛矿薄膜，在该过程的第一步中沉积了卤化铅薄膜，随后转化为钙钛矿。在顺序沉积氯化铅和碘化铅薄膜的过程中，未观察到碘被碘取代Cl，所述碘化铅薄膜反应形成氯化铅碘化物相（PbIC1）。Cl被碘离子取代仅在转化为钙钛矿相期间发生。转换PbI时，可以实现较大的钙钛矿晶粒（大于2 µm）₂膜与钙钛矿相比，含氯的卤化铅膜，与文献相矛盾。然而，与未掺杂的钙钛矿太阳能电池（8.76％）相比，掺Cl的钙钛矿太阳能电池显示出高达10.87％的改善的器件效率。