A Fudan University team has developed a high-performance 2D Ruddlesden–Popper (RP) phase perovskite photodetector by employing an asymmetric electrode configuration that dramatically enhances optoelectronic performance.
In their work, single-crystal (PEA)₂PbBr₄ (PPB) microplates, grown via a liquid–air interfacial method with thicknesses from ~60 to 350 nm, served as the active layer. By introducing two dissimilar metal electrodes, the researchers formed asymmetric contact barriers, enabling more effective band alignment and charge extraction compared with conventional symmetric devices.
This interface engineering yielded a biased photocurrent enhancement of 5.59 × 10⁴ times, together with self-powered operation characterized by a high on/off ratio of 7.69 × 10³, ultralow dark current (3.28 × 10⁻¹³ A), and strong photocurrent output (2.41 × 10⁻⁹ A). These results underscore how carefully tuned metal–perovskite interfaces can dictate carrier dissociation dynamics and overall device efficiency in 2D RP-phase systems.
The findings propose a straightforward yet potent strategy for realizing next-generation self-powered photodetectors and advancing the broader understanding of charge transport and interfacial physics in layered perovskite materials.
