• • Achieved highly ordered single-QW 2D perovskite films via solvent-hydrolysis-driven crystallization control, eliminating disordered multiple-QW structures that typically degrade device performance.
• • Photodetector based on these films demonstrates a responsivity of 1153 mA/W and a detectivity of 6.98 × 10^12 Jones, representing a significant improvement over conventional solution-processed 2D perovskite devices.
• • The method leverages dimethylamine (DMA) formed from DMF hydrolysis to prevent cluster aggregation, ensuring a uniform colloidal distribution and a homogeneous (DMA,MA)PbI3 phase, which is critical for single-QW formation.
• • Devices exhibit excellent photostability under ambient conditions, addressing the long-term stability bottleneck that has hindered commercial adoption of perovskite optoelectronics.