Two-dimensional (2D) PbI₂ flakes have been attracting intensive attention as one potential candidate for the modern optoelectronics. However, suffered from the instability of kinetics-driven growth, the fabricated 2D PbI₂ flakes have a wide dimensional distribution even under the same conditions. Herein, a novel facile space confined physical vapor deposition (PVD) process is provided to synthesize uniform triangle PbI₂ flakes with high quality. The confined space provides a relatively stable growth environment that renders more control on the growth kinetics, leading to highly uniform triangle PbI₂ flakes with the average size of 5 µm and thickness of 17 nm. Moreover, as-fabricated PbI₂-based photodetectors show promising stable and flexible optoelectronic performances to 470 nm light, including high responsivity (0.72 A W⁻¹), large on/off ratio up to 900, fast photoresponse speed (rise time of 13.5 ms and decay time of 20 ms) and high detectivity (1.04 × 10¹⁰ Jones). The well-controllable growth of the uniform triangle PbI₂ flakes and the detailed exploration of their optoelectronic properties are particularly valuable for their further practical applications.

二维 (2D) PbI ₂薄片作为现代光电子学的一种潜在候选材料而备受关注。然而，由于动力学驱动生长的不稳定性，制造的 2D PbI ₂薄片即使在相同条件下也具有较宽的尺寸分布。在此，提供了一种新型简便的空间受限物理气相沉积 (PVD) 工艺，以合成高质量的均匀三角形 PbI _2薄片。密闭空间提供了一个相对稳定的生长环境，可以更好地控制生长动力学，从而产生高度均匀的三角形 PbI ₂薄片，平均尺寸为 5 µm，厚度为 17 nm。此外，制造的 PbI ₂基于-的光电探测器对 470 nm 光显示出稳定和灵活的光电性能，包括高响应率 (0.72 A W ⁻¹ )、高达 900 的大开/关比、快速光响应速度（上升时间为 13.5 ms，衰减时间为 20 ms）和高检测率（1.04 × 10 ¹⁰琼斯）。均匀三角形 PbI ₂薄片的可控生长及其光电特性的详细探索对其进一步的实际应用特别有价值。