Organic-inorganic metal halide perovskites have emerged as one of the most promising materials in diverse fields of optoelectronics such as solar cells, light emitting diodes, lasers, and image sensors, due to their excellent material properties and low-cost production. Despite continuous demands on freeform optoelectronic circuitries with high integration density, most of perovskite-based devices are limited to 2D thin film forms due to technological limitation of manufacturing. Dr. Ji Tae Kim and his student Mr. Mojun Chen from the Department of Mechanical Engineering at the University of Hong Kong (HKU ME), for the first time, have developed a 3D printing method for perovskites at the nanoscale. Their key idea is to promptly steer evaporation-assisted crystallization inside a very tiny ink (10-15 liters) by using a printing nozzle. To demonstrate its capability for 3D additive manufacturing, his team have made a variety of exemplary perovskite 3D nano-objects with designed shapes and positions. The researchers expect the method has the potential to create freeform perovskite nanostructures for customized optoelectronics. This research was performed through collaboration with Dr. Shien-Ping Feng (HKU ME), Dr. Dong-Keun Ki (HKU Physics), and Dr. Seung Kwon Seol (KERI, Korea). The result of this research is published in Advanced Materials and selected as the front cover of the volume 31, Issue 44 (https://onlinelibrary.wiley.com/doi/10.1002/adma.201970310). The full article is available in the following website: https://doi.org/10.1002/adma.201904073
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