Solution Patterning Approach for Two-Dimensional Perovskite Nanocrystal Arrays

Two-dimensional perovskite crystals have attracted intensive interest for its diverse optoelectronic characteristics owing to their superior semiconducting properties. However, most studies to date have been limited to one single crystal that are difficult to implement for integrated device arrays due to their incompatibility with selective growth or typical lithography processes. Here, we report facile one-step solution process for synthesizing 2D perovskite crystal arrays through the meniscus-guided coating on pre-patterned substrates. We further utilize this novel method for synthesis of lateral hetero-structured perovskite nanocrystal arrays. Six different 2D perovskite crystal arrays showing red, blue, and green colored emission including heterostructures have been successfully realized. Structural and optical characterizations demonstrate that the crystals display excellent crystalline quality and optical properties. Moreover, the method has been used to prepare high-performance 2D perovskite crystal photosensors. We believe that this strategy can be utilized as a guideline for the fundamental investigation of optical properties and development of high-performance optoelectronics of perovskite materials including photosensors and displays.