Phase‐Purified and Highly Textured 2D Perovskite ( n = 5) Photodetectors Grown via a Temperature‐Gradient‐Free Thermal‐Pressing‐Casting Strategy for Broadband Response and Weak‐Light Imaging
Self‐powered photodetectors (SPPDs) with broadband response and high‐resolution weak‐light imaging capabilities are crucial for next‐generation optoelectronics. Quasi‐two‐dimensional (quasi‐2D) Ruddlesden‐Popper perovskites are promising candidates, but their solution‐processed films typically suffer from multiphas...