Nanowires are extremely thin wires but with variable lengths. They are used in sensors, nanoelectronics, photonics, and renewable energy. In general, nanowires are superior in performance as compared to polycrystalline materials, which are used in similar applications. However, manufacturing nanowires can be difficult to standardize. EPFL scientists have now developed a standardized method for controlling the growth of nanowires from perovskites, which are extremely promising materials in solar-cell and laser technology. The method could be automated on an industrial scale to fabricate chips. This time-lapse video showing the guided growth of perovskite nanowires in a nanofluidic channel.