Route to the Smallest Doped Semiconductor: Mn2+-Doped (CdSe)13 Clusters

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• 作者：Jiwoong Yang ; Rachel Fainblat ; Soon Gu Kwon ; Franziska Muckel ; Jung Ho Yu ; Hendrik Terlinden ; Byung Hyo Kim ; Dino Iavarone ; Moon Kee Choi ; In Young Kim ; Inchul Park ; Hyo-Ki Hong ; Jihwa Lee ; Jae Sung Son ; Zonghoon Lee ; Kisuk Kang ; Seong-Ju Hwang ; Gerd Bacher ; Taeghwan Hyeon
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：137
• 期：40
• 页码：12776-12779
• 全文大小：336K
• ISSN：1520-5126

文摘

Doping semiconductor nanocrystals with magnetic transition-metal ions has attracted fundamental interest to obtain a nanoscale dilute magnetic semiconductor, which has unique spin exchange interaction between magnetic spin and exciton. So far, the study on the doped semiconductor NCs has usually been conducted with NCs with larger than 2 nm because of synthetic challenges. Herein, we report the synthesis and characterization of Mn²⁺-doped (CdSe)₁₃ clusters, the smallest doped semiconductors. In this study, single-sized doped clusters are produced in large scale. Despite their small size, these clusters have semiconductor band structure instead of that of molecules. Surprisingly, the clusters show multiple excitonic transitions with different magneto-optical activities, which can be attributed to the fine structure splitting. Magneto-optically active states exhibit giant Zeeman splittings up to elevated temperatures (128 K) with large g-factors of 81(卤8) at 4 K. Our results present a new synthetic method for doped clusters and facilitate the understanding of doped semiconductor at the boundary of molecules and quantum nanostructure.