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Using simulations we explore the behaviour of two-dimensional colloidal(poly)crystals doped with active particles. We show that these active dopantscan provide an elegant new route to removing grain boundaries in polycrystals.Specifically, we show that active dopants both generate and are attracted todefects, such as vacancies and interstitials, which leads to clustering ofdopants at grain boundaries. The active particles both broaden and enhance themobility of the grain boundaries, causing rapid coarsening of the crystaldomains. The remaining defects recrystallize upon turning off the activity ofthe dopants, resulting in a large-scale single-domain crystal.

Fabricating large two-dimensional single colloidal crystals by doping with active particles