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Title: Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor
Authors: Saha, Avijit
Shetty, Amitha
Pavan, A. R.
Chattopadhyay, Soma
Shibata, Tomohiro
Viswanatha, Ranjani
Keywords: Chemistry
Materials Science
Nanocrystal Heterostructures
Zeeman Splittings
Issue Date: 2016
Publisher: American Chemical Society
Citation: Saha, A.; Shetty, A.; Pavan, A. R.; Chattopadhyay, S.; Shibata, T.; Viswanatha, R., Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor. Journal of Physical Chemistry Letters 2016, 7 (13), 2420-2428
Journal of Physical Chemistry Letters
Abstract: Effective manipulation of magnetic spin within a semiconductor leading to a search for ferromagnets with semiconducting properties has evolved into an important field of dilute magnetic semiconductors (DMS). Although a lot of research is focused on understanding the still controversial origin of magnetism, efforts are also underway to develop new materials with higher magnetic temperatures for spintronics applications. However, so far, efforts toward quantum-dots(QDs)-based DMS materials are plagued with problems of phase separation, leading to nonuniform distribution of dopant ions. In this work, we have developed a strategy to synthesize highly crystalline, single-domain DMS system starting from a small magnetic core and allowing it to diffuse uniformly inside a thick CdS semiconductor matrix and achieve DMS QDs. X-ray absorption fine structure (XAFS) spectroscopy and energy-dispersive X-ray spectroscopy scanning transmission electron microscopy (STEM-EDX) indicates the homogeneous distribution of magnetic impurities inside the semiconductor QDs leading to superior magnetic property. Further, the versatility of this technique was demonstrated by obtaining ultra large particles (similar to 60 nm) with uniform doping concentration as well as demonstrating the high quality magnetic response.
Description: Restricted Access
ISSN: 1948-7185
Appears in Collections:Research Papers (Ranjani Viswanatha)

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