Pavel Md Riad Sarkar, Chen Yunhua, Santhiran Anuluxan, Gi Eunbyeol, Ochoa-Romero Kerly, Miller Gordon J, Guirado Gonzalo, Rossini Aaron J, Vela Javier
Department of Chemistry, Iowa State University, Ames, Iowa 50011 United States.
Ames National Laboratory, Ames, Iowa 50011 United States.
ACS Energy Lett. 2024 Sep 20;9(10):5012-5018. doi: 10.1021/acsenergylett.4c02032. eCollection 2024 Oct 11.
Ternary tetrahedral II-III-VI semiconductors, where II is Zn or Cd, III In or Ga, and VI S, Se, or Te, are of interest in UV radiation detectors in medicine and space physics as well as CO photoreduction under visible light. We synthesize colloidal II-III-VI semiconductor nanocrystals from readily available precursors and ascertain their ternary nature by structural and spectroscopic methods, including Se solid-state NMR spectroscopy. The pyramidally shaped nanocrystals range between 2 and 12 nm and exhibit optical gaps of 2-3.9 eV. In the presence of excess anions on the particle surface, treatment with Lewis acidic, Z-type ligands results in better passivation and enhanced photoluminescence. Electronic structure calculations reveal the most stable, lowest energy polymorphs and coloring patterns. This work will pave the way toward more environmentally friendly, ternary semiconductors for optoelectronics and electrocatalysis.
三元四面体II-III-VI族半导体，其中II为锌或镉，III为铟或镓，VI为硫、硒或碲，在医学和空间物理学中的紫外线辐射探测器以及可见光下的一氧化碳光还原方面具有重要意义。我们从容易获得的前驱体合成了胶体II-III-VI族半导体纳米晶体，并通过结构和光谱方法，包括硒固态核磁共振光谱，确定了它们的三元性质。金字塔形状的纳米晶体尺寸在2到12纳米之间，光学带隙为2-3.9电子伏特。在颗粒表面存在过量阴离子的情况下，用路易斯酸性的Z型配体处理可实现更好的钝化并增强光致发光。电子结构计算揭示了最稳定、能量最低的多晶型物和着色模式。这项工作将为更环保的三元半导体用于光电子学和电催化铺平道路。
