‘Downscaling’, the process of making elementary devices smaller in size, is at the heart of many technological breakthroughs in computing, information display, and human-machine interactions. For example, the downscaling of transistors has accelerated the speed of computers following the Moore’s law. Similarly, the down-sizing of LEDs based on III-V semiconductors led to the invention of micro-LEDs, which are considered as an ‘ultimate technology’ for displays. However, micro-LEDs are very expensive to make as they require costly processes i...