A simple way to get complex semiconductors to assemble themselves

https://www6.slac.stanford.edu/news/2021-09-15-simple-way-get-complex-semiconductors-assemble-themselves.aspx

"barbell-shaped molecules that direct the action. Each end of a barbell carries a template for growing one type of layer. As the layers crystallize – a process similar to making rock candy -- the barbells automatically link them together in the proper order... 2D perovskites precisely layered with other 2D materials to produce crystals with a wide range of electronic properties"