Ion Aggregation-Induced Crystallization Strategy for Printing Morphology-Controllable Perovskite Single-Crystal Arrays and Integrated Devices

Perovskite single crystals have emerged as attractive structures for integrated devices. However, due to uncontrolled crystallization, the versatile and scalable fabrication of arrays of perovskite single crystals with controllable morphology and location remains a great challenge. Here, we report a facile printing strategy to controllably fabricate perovskite single-crystal arrays with well-defined morphology and location. Through modulating perovskite precursor ion aggregation in microdroplets by controlling the temperature of substrates, perovskite single-crystal arrays with controlled morphologies are fabricated, which can be selectively integrated on silicon for high-performance-type tailored laser arrays. More importantly, integrated perovskite single-crystal microstructures are printed, showing an efficiently coupling property with well-maintained intrinsic characters of the original signals. This strategy enables fully inkjet-printed morphology-controllable perovskite single-crystal arrays and functional coupling-structure arrays, which offers new opportunities for integrated photonic and optoelectronic devices.