Wafer-sized 2D perovskite single crystal thin films for UV photodetectors

Two-dimensional (2D) organic-inorganic hybrid perovskites are promising for next-generation optoelectronic materials due to their enhanced stability, controllable quantum well thickness and excellent photoelectric properties. The growth of large lateral size, small thickness and high-quality single crystal films is necessary for the practical application of devices. Herein, we report a gas-liquid interface crystalline route to grow BA(2)PbBr(4) (BA = CH3CH2CH2CH2NH3+) single crystal films and achieve wafer size (38 cm(2)) and thinness as little as 78 nm (aspect ratio > 10(5)). Moreover, an ultraviolet-photodetector of the single crystal thin film presents a dark current of similar to 10(-14) A, a detectivity of similar to 10(12) Jones and fast response time (tau(rise) = 9.7 ms and tau(decay) = 8.8 ms). Our work provides a way to grow 2D perovskite single crystal films with large size and small thickness, which is significant for the development of perovskite-type high-performance optoelectronic devices.

Automated summary

This study successfully prepared BA(2)PbBr(4) single crystal films using a gas-liquid interface crystalline route, achieving large size and ultra-thin thickness. The ultraviolet photodetector of the single crystal film exhibited excellent performance.