Yin Deqiang, Li Qi, Liu Yang, Swihart Mark T
Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260-4200, USA.
Nanoscale. 2021 Mar 12;13(9):4828-4834. doi: 10.1039/d0nr08991e.
We report the colloidal synthesis of quaternary kesterite CZTS-CZTSe heterostructures via anion exchange reactions on a kesterite CZTS template. The crystal phase selectivity during the synthesis (kesterite vs. wurtzite) is due to the initial nucleation of cubic Cu9S5 seeds, followed by incorporation of Zn and Sn. Upon injection of Se-precursor, which triggered simultaneous anion exchange and overgrowth of the pristine CZTS template, sandwich CZTS-CZTSe (core-tip) nanoheterostructures were obtained. X-ray photoelectron spectroscopy (XPS) and optical band gap measurement results suggest a change of intrinsic electronic structure of CZTS by Se-treatment. Our study not only provides insight into mechanisms of formation of kesterite CZTS nanocrystals (NCs) and subsequent anion exchange reactions, but also opens doors to access novel CZTSSe nanostructures for potential applications.
我们报道了通过在方铅矿型CZTS模板上进行阴离子交换反应，胶体合成四元方铅矿型CZTS-CZTSe异质结构。合成过程中的晶相选择性（方铅矿型与纤锌矿型）归因于立方Cu9S5晶种的初始成核，随后是锌和锡的掺入。注入硒前驱体后，引发了原始CZTS模板的同时阴离子交换和过度生长，从而获得了夹心式CZTS-CZTSe（核-尖）纳米异质结构。X射线光电子能谱（XPS）和光学带隙测量结果表明，硒处理改变了CZTS的本征电子结构。我们的研究不仅深入了解了方铅矿型CZTS纳米晶体（NCs）的形成机制以及随后的阴离子交换反应，还为获取用于潜在应用的新型CZTSSe纳米结构打开了大门。
