In this research, we demonstrated the use of hafnium acetylacetonate (Hfaca) dissolved in ethanol as a buffer layer for perovskite solar cells from non-halide Pb (dehydrated lead acetate) source material. The inverted p-i-n planar heterojunction structure was employed in this work. A one step spin-coating method was used in depositing the perovskite solution before thermal annealing at 90 °C for 5 min to form the perovskite film. Hfaca has been previously used as a buffer layer, but the optimal concentration has not been reported. The optimum concentration of Hfaca was found to be 1.0 mg/ml, resulting in a power conversion efficiency (PCE) of 12.23% corresponding to more than 30% improvement when compared to the control device (phenyl-C₆₁-butyric acid methyl ester/Ag) without Hfaca, which has a PCE of 8.89%. Hfaca as a buffer layer leads to superior stability, retaining about 90% of its original PCE values after 15 days of storage in a glove box, compared to the control device, which retains 70% of the initial PCE value under the same storage.

中文翻译：

---

乙酰丙酮ha缓冲层对以醋酸铅为铅源的卤化钙钛矿型铅酸锂太阳能电池性能的影响

在这项研究中，我们证明了使用溶解在乙醇中的乙酰丙酮ha（Hfaca）作为非卤化物Pb（脱水乙酸铅）源材料的钙钛矿太阳能电池的缓冲层。在这项工作中采用了倒针平面异质结结构。一步旋涂法用于沉积钙钛矿溶液，然后在90°C进行5分钟的热退火，以形成钙钛矿膜。Hfaca以前曾用作缓冲层，但尚未报告最佳浓度。发现Hfaca的最佳浓度为1.0 mg / ml，导致功率转换效率（PCE）为12.23％，与控制装置（phenyl-C _61）相比，提高了30％以上-丁酸甲酯/ Ag），不含Hfaca，其PCE为8.89％。作为控制层的Hfaca具有出色的稳定性，与在同一存储条件下可保留初始PCE值的70％的控制装置相比，在手套箱中存储15天后可保留其原始PCE值的90％左右。