Although chemical bath of TiCl₄ treatment has been used to serve as a compact layer for planar perovskite solar cells (PSCs), uneven TiO₂ particle sizes and chlorine residual would decrease the device performance. In this study, we modify the TiCl₄ treatment process through well-controlled the kinetics grown of TiO₂ nanoparticle, leading to a uniform and ultrathin TiO₂ blocking layer. A dense and pinholeless TiO₂ blocking layer is crucial for high-performance PSCs because of its effective charge extraction and elimination of carrier shunting path. The as-fabricated devices using modified process of TiO₂ blocking layer exhibit the best power conversion efficiency (PCE) of 17.89% with an average PCE of 17.5%. Scanning electron microscopy and cyclic voltammetry analysis of TiO₂ blocking layer reveal that this process improved surface uniformity and the carrier blocking capability.

尽管已使用TiCl ₄处理的化学浴作为平面钙钛矿太阳能电池（PSC）的致密​​层，但不均匀的TiO ₂粒径和氯残留会降低器件性能。在这项研究中，我们通过很好地控制TiO ₂纳米颗粒的生长动力学来修改TiCl ₄处理工艺，从而形成均匀且超薄的TiO ₂阻挡层。致密且无针孔的TiO ₂阻挡层对高性能PSC至关重要，因为它可以有效地提取电荷并消除载流子分流路径。使用改进的TiO ₂工艺制造的设备阻挡层表现出最佳的功率转换效率（PCE）为17.89％，平均PCE为17.5％。TiO ₂阻挡层的扫描电子显微镜和循环伏安分析表明，该过程改善了表面均匀性和载流子阻挡能力。