High-performance and stable 2D/3D perovskite photodetectors enabled by PEAI passivation

Three-dimensional (3D) perovskite photodetectors (PPDs) demonstrate remarkable photoelectric detection ability, but the intrinsic instability of 3D perovskite films against moisture, oxygen, and temperature has been a roadblock for achieving great stability and reliability of the resulting PDs, which can be mainly ascribed to the inevitable defects on surfaces and grain boundaries that can incur nonradiative charge recombination to impair device performance and initiate the degradation of perovskites. In this work, we introduced the two-dimensional (2D) perovskite material PEAI to fabricate a high-performance and stable 2D/3D stacked PPD. As a result, the responsivity of the PEAI processed PPD (PEAI-PPD) reached 1.19 A/W under the illumination of 532 nm laser with the power density of 5 μW/cm² at bias voltage of −1 V, and retains 80.15% of the initial value after 16 days of nonencapsulated storage at 10%-15% relative humidity (RH). Our work provides a simple and effective method for the fabrication of high-performance and stable 2D/3D stacked PPDs, which has great application potential in visible light communication, imaging and environmental monitoring under complex environmental conditions.