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A facile and general approach to polynary semiconductor nanocrystals via a modified two-phase method

机译：通过改进的两相方法轻松实现多元半导体纳米晶体的通用方法

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摘要

Cu_2ZnSnS_4 nanocrystals were synthesized through a modified two-phase method and characterized with transmission electron microscopy (TEM), powder x-ray diffraction (XRD) and UV-vis spectroscopy. Inorganic metal salts were dissolved in the polar solvent triethylene glycol (TEG) and then transferred into the non-polar solvent 1-octadecene (ODE) by forming metal complexes between metal ions and octadecylamine (ODA). Since nucleation and growth occur in the single phase of the ODE solution, nanocrystals could be produced with qualities similar to those obtained through the hot-injection route. Balancing the reactivity of the metal precursors is a key factor in producing nanocrystals of a single crystalline phase. We found that increasing the reaction temperature increases the reactivity of each of the metal precursors by differing amounts, thus providing the necessary flexibility for obtaining a balanced reactivity that produces the desired product. The versatility of this synthesis strategy was demonstrated by extending it to the production of other polynary nanocrystals such as binary (CuS), ternary (CuInS_2) and pentanary (Cu_(2 - x)Ag_xZnSnS _4) nanocrystals. This method is considered as a green synthesis route due to the use of inorganic metal salts as precursors, smaller amounts of coordinating solvent, shorter reaction time and simpler post-reaction treatment.
机译：通过改进的两相法合成了Cu_2ZnSnS_4纳米晶体，并用透射电子显微镜（TEM），粉末X射线衍射（XRD）和紫外可见光谱进行了表征。将无机金属盐溶解在极性溶剂三甘醇（TEG）中，然后通过在金属离子和十八烷基胺（ODA）之间形成金属络合物将其转移到非极性溶剂1-十八碳烯（ODE）中。由于成核和生长是在ODE溶液的单相中发生的，因此可以生产出质量与通过热注入途径获得的质量相似的纳米晶体。平衡金属前体的反应性是生产单晶相纳米晶体的关键因素。我们发现提高反应温度可以使每种金属前体的反应性增加不同的量，从而为获得产生所需产物的平衡反应性提供了必要的灵活性。该合成策略的多功能性通过将其扩展到其他多元纳米晶体（如二元（CuS），三元（CuInS_2）和五元（Cu_（2-x）Ag_xZnSnS _4）纳米晶体的生产）得到了证明。由于使用无机金属盐作为前体，较少量的配位溶剂，较短的反应时间和较简单的后反应处理，因此该方法被视为绿色合成路线。

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