Although two-dimensional(2D) tin selenides are attracting intense attentions, studies on its phase transition are still relatively few. Here we report a facile way to control the phase growth of tin selenide flakes on mica and SiO₂/Si by only adjusting nominal Sn:Se ratio, which refers to the amount of loaded SnO₂ and Se precursors. High normal Sn:Se ratio induced SnSe flakes, conversely SnSe₂ flakes formed. It could be used as a practical guide to selectively synthesize pure phase of single crystalline 2D layered chalcogenide materials similar to tin selenides.

中文翻译：

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通过化学气相沉积控制硒化锡薄片相的简便方法

尽管二维（2D）硒化锡受到了广泛的关注，但有关其相变的研究仍相对较少。在这里，我们报告了一种仅通过调节标称的Sn：Se比率来控制硒化锡薄片在云母和SiO ₂ / Si上的相生长的简便方法，Sn：Se比率是指装载的SnO ₂和Se前体的量。正常的Sn：Se比值高会诱发SnSe薄片，相反会形成SnSe ₂薄片。它可用作选择合成类似于硒化锡的单晶2D层状硫族化物材料的纯相的实用指南。