A possible reason may lie in the lack of simple and benign methods that employed reactivity-matching precursors for the growth of the homogeneous Cu2SnTe3 NCs. To the best of our knowledge, there is no report on the preparation of Cu2SnTe3 NCs performed by solution-based routes. Although Cu2SnTe3 crystals have been synthesized in high temperature solid-state reaction,10,11 this energy-intensive and time-consuming method usually resulted in products with irregular, large size and size distribution and uncontrolled aggregate formation, which would limit their potential applications