Low-Cost and Simple Synthesis of Dispersed CsPbBr3 Perovskite Single-Crystal Wires with Lengths over 1 mm Using Bernoulli’s Principle

Compared with polycrystalline thin films, perovskite single crystals without grain boundaries have better photovoltaic performance and stability. However, due to the extremely low solubility of all-inorganic perovskite in organic solvents and the complex phase diagram of CsPbBr3, directly growing large-sized CsPbBr3 perovskite single-crystal wires is challenging. Here, we have developed an airflow-assisted growth method for the rapid synthesis of large quantities of high-quality, dispersed, ultralong CsPbBr3 single-crystal wires under ambient conditions. This method is green (no additives) and low cost (no special treatment). The growth kinetics of single-crystal wires using this method have been elucidated, and their structural and optoelectronic properties were characterized. Some of the CsPbBr3 single-crystal wires synthesized by this method can exceed 1 mm in length with a low trap density of about 9.06 × 1011 cm–3. The constructed photodetector responsivity is up to 0.365 A/W and detectivity is over 3.3 × 1013 Jones, indicating great potential for optoelectronic applications. This low-cost, high-quality all-inorganic CsPbBr3 single-crystal wire growth method is highly scalable and may facilitate the research and application of all-inorganic perovskite single crystals.