Monodisperse CuInS2/CdS and CuInZnS2/CdS Core-Shell Nanorods with a Strong Near-Infrared Emission

作者：Portniagin, Arsenii S.; Ning, Jiajia; Wang, Shixun; Li, Zhuo; Sergeev, Aleksander A.; Kershaw, Stephen, V; Zhong, Xiaoyan; Rogach, Andrey L.^*

来源：Advanced Optical Materials, 2022, 10(8): 2102590.

DOI：10.1002/adom.202102590

• ternary chalcogenides
• nanorods
• anisotropic growth
• near-infrared emission
• quasi-type II heterostructures

Given the ubiquitous examples of semiconductor nanorods synthesis, CuInS2-based anisotropic heterostructures still lag behind in terms of shape/optical properties control. Here, core/shell CuInS2/CdS dot-in-rod nanoheterostructures which exhibit high degree of the morphology control, and a strong emission in the near-infrared range of 700-900 nm, are realized. The authors made use of the seeded growth approach utilizing wurtzite CuInS2 quantum dots as seeds, which allows for tuning the dimension of the resulting core/shell nanorods, including the core size and the shell thickness. Time-dependent photoluminescence studies reveal slowing down of the recombination rate with increasing thickness of the shell, which is characteristic for the quasi-type II heterostructure. Alloying of the CuInS2 cores with Zn does not perturb the shell growth process, but enables improvement of the photoluminescence quantum yield of the resulting core/shell CuInZnS2/CdS nanorods to 45%, as compared to approximate to 30% for CuInS2/CdS nanorods.