Magnetic CdSe-based quantum dots grown on Mn-passivated ZnSe

Titova, L. V.; Furdyna, J. K.; Dobrowolska, M.; Lee, S.; Topuria, T.; Moeck, P.; Browning, N. D.
February 2002
Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1237
Academic Journal
In this letter we describe the properties of self-assembled CdSe quantum dots (QDs) grown on Mn-passivated ZnSe buffers. We show that the Mn deposited on the ZnSe surface during the passivation process acts as a nucleating seed for self-assembled QD formation. For moderate amounts of Mn deposition, the dots grown in this way show a significant improvement in size uniformity compared to CdSe dots grown on ZnSe without Mn passivation. Using photoluminescence, we also show that the dots exhibit large Zeeman splitting, indicating that this growth method is suitable for fabricating magnetic QDs that exhibit strong spin polarization effects.


Related Articles

  • Photothermal deflection and photoluminescence studies of CdS and CdSe quantum dots. Yuang, Yu-Shen; Chen, Yang-Fang; Lee, Yang-Yao; Liu, Li-Chi // Journal of Applied Physics;9/1/1994, Vol. 76 Issue 5, p3041 

    Discusses a study on the observation of the quantum confinement effect by using photothermal deflection spectroscopy and photoluminescence experiments of cadmium sulphide and cadmium selenide quantum dots. Analysis of quantum confinement effect; Measurement of absorption spectra; Source of...

  • Silicon nanocrystals with ensemble quantum yields exceeding 60%. Jurbergs, David; Rogojina, Elena; Mangolini, Lorenzo; Kortshagen, Uwe // Applied Physics Letters;6/5/2006, Vol. 88 Issue 23, p233116 

    Silicon nanocrystals with diameters of less than 5 nm show efficient photoluminescence at room temperature. For ensembles of silicon quantum dots, previous reports of photoluminescence quantum yields have usually been in the few percent range, and generally less than 30%. Here we report the...

  • Photo-oxidation-enhanced coupling in densely packed CdSe quantum-dot films. Wang, Xiaoyong; Zhang, Jiayu; Nazzal, Amjad; Xiao, Min // Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p162 

    Photo-oxidation of densely packed monolayer of CdSe quantum dots (QDs) was studied by time-resolved photoluminescence (PL) spectroscopy. Electrons yielded in QDs by the strong laser-pulse irradiation can assist the oxidation of CdSe QDs. Such rapid photo-oxidation does not introduce more...

  • Mechanism of photoinduced luminescence degradation CdS...Se... quantum dots. Kunets, V. P.; Kulish, N. R.; Lisitsa, M. P.; Bryksa, V. P. // Semiconductor Physics, Quantum Electronics & Optoelectronics;2003, Vol. 6 Issue 3, p299 

    A possible mechanism of the photoinduced luminescence degradation in the hexagonal CdSXSe1-X quantum dots synthesized in a glass matrix is discussed using luminescence decay kinetic investigations and ab initio calculations of chemical bond energies at the boundary between CdSe cluster and SiOX...

  • Fluorescence Properties of Hybrid CdTe Quantum Dots-Porphyrins Thin Films in Organic Vapors. Bakar, Norhayati Abu; Rahmi, Aidhia; Umar, Akrajas Ali; Salleh, Muhamad Mat; Yahaya, Muhammad // AIP Conference Proceedings;10/24/2010, Vol. 1284 Issue 1, p64 

    This paper reports a study on the fluorescence properties of thin films utilizing quantum dots (QDs) of cadmium telluride (CdTe) hybridized with porphyrins (tetraphenyl porphine cobalt (II)) (CoTTP) thin films under exposure of various gases. The high yellow luminescence QDs were synthesized...

  • Optical properties of CdTe/ZnTe quantum dots sandwiched between two quantum wells with ZnTe separation barriers. Lee, H. S.; Park, H. L.; Kim, T. W. // Applied Physics Letters;10/30/2006, Vol. 89 Issue 18, p181929 

    Temperature-dependent photoluminescence (PL) measurements were performed to investigate the optical properties of CdTe/ZnTe nanostructures. The activation energy of the CdTe/ZnTe quantum dots (QDs) sandwiched between two quantum wells (QWs) with ZnTe separation barriers, as obtained from the...

  • Synthesis of CdTe quantum dots using a heterogeneous process at low temperature and their optical and structural properties. Jose, R.; Biju, V.; Yamaoka, Y.; Nagase, T.; Makita, Y.; Shinohara, Y.; Baba, Y.; Ishikawa, M. // Applied Physics A: Materials Science & Processing;2004, Vol. 79 Issue 8, p1833 

    Luminescent CdTe quantum dots (QDots) have been synthesized through a low-temperature process employing a heterogeneous reaction between cadmium acetate and tri-n-octyl phosphine tellurium (TOPTe) in the presence of tri-n-octyl phosphine oxide (TOPO). UV-visible absorption spectra revealed that...

  • Photoinduced fluorescence enhancement in colloidal CdSeTe/ZnS core/shell quantum dots. Yuan, C. T.; Chou, W. C.; Chuu, D. S.; Chen, Y. N.; Lin, C. A.; Chang, W. H. // Applied Physics Letters;5/5/2008, Vol. 92 Issue 18, p183108 

    Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTe/ZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced...

  • Surface passivation and oxidation of cadmium telluride and properties of metal-oxide-CdTe structures. Chu, T. L.; Chu, Shirley S.; Ang, S. T. // Journal of Applied Physics;10/15/1985, Vol. 58 Issue 8, p3206 

    Investigates surface passivation and oxidation of cadmium telluride (CdTe). Information on the technical applications of CdTe; Details of experimental techniques used; Characteristic of metal-oxide-semiconductor structures prepared from the oxidation of cadmium.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics