Bimodal distribution of Indium composition in arrays of low-pressure metalorganic-vapor-phase-epitaxy grown InGaAs/GaAs quantum dots

Saint-Girons, G.; Patriarche, G.; Largeau, L.; Coelho, J.; Mereuta, A.; Moison, J. M.; Ge´rard, J. M.; Sagnes, I.
October 2001
Applied Physics Letters;10/1/2001, Vol. 79 Issue 14, p2157
Academic Journal
Low-pressure metalorganic-vapor-phase-epitaxy (LP-MOVPE) grown InGaAs/GaAs quantum dots (QDs) emitting around 1.3 μm have been studied by photoluminescence and transmission electron microscopy (TEM). We demonstrate the presence of a bimodal inhomogeneous broadening of the photoluminescence, correlated with a bimodal QDs contrast distribution in the TEM micrographs. Increasing the growth temperature of the dots induces a decrease of the ratio between the number of In-poor and In-rich QDs, illustrating the crucial influence of indium desorption on the LP-MOVPE growth of InGaAs QDs. © 2001 American Institute of Physics.


Related Articles

  • Structural and optical properties of shape-engineered InAs quantum dots. Kim, Jin Soo; Lee, Jin Hong; Hong, Sung Ui; Han, Won Seok; Kwack, Ho-Sang; Kim, Jong Hee; Oh, Dae Kon // Journal of Applied Physics;8/15/2003, Vol. 94 Issue 4, p2486 

    Shape-engineered InAs quantum dots (QDs) were grown by using thin (In)0.15(Ga)0.85(As and a)monolayer (ML) of InAs with different periods on 3 ML InAs QDs and their structural and optical properties were investigated by transmission electron microscopy (TEM), photoluminescence (PL), and...

  • Nanoscale InGaAs concave disks fabricated by heterogeneous droplet epitaxy. Mano, Takaaki; Watanabe, Katsuyuki; Tsukamoto, Shiro; Koguchi, Nobuyuki; Fujioka, Hiroshi; Oshima, Masaharu; Lee, Chae-Deok; Chae-Deok Lee; Leem, Jae-Young; Jae-Young Leem; Lee, Hwack Joo; Hwack Joo Lee; Noh, Sam Kyu; Sam Kyu Noh // Applied Physics Letters;6/12/2000, Vol. 76 Issue 24 

    The detailed cross-sectional structure of InGaAs quantum dots fabricated by a heterogeneous droplet epitaxy method was investigated by means of cross-sectional transmission electron microscopy observation. It was confirmed that concave disks without any dislocations or wetting layer were formed...

  • CdSe/ZnSe quantum dot structures grown by molecular beam epitaxy with a CdTe submonolayer stressor. Sedova, I. V.; Lyublinskaya, O. G.; Sorokin, S. V.; Sitnikova, A. A.; Toropov, A. A.; Donatini, F.; Le Si Dang; Ivanov, S. V. // Semiconductors;Nov2007, Vol. 41 Issue 11, p1345 

    A procedure for formation of CdSe quantum dots (QDs) in a ZnSe matrix is suggested. The procedure is based on the introduction of a CdTe submonolayer stressor deposited on the matrix surface just before deposition of the material of the QDs. (For CdTe/ZnSe structure, the relative lattice...

  • Three-dimensional electronic properties of multiple vertically stacked InAs/GaAs self-assembled quantum dots. Kim, J. H.; Woo, J. T.; Kim, T. W.; Yoo, K. H.; Lee, Y. T. // Journal of Applied Physics;9/15/2006, Vol. 100 Issue 6, p063716 

    The microstructural properties and the shape of an InAs/GaAs array grown by molecular beam epitaxy were studied using transmission electron microscopy (TEM) measurements, and the interband transitions were investigated by using temperature-dependent photoluminescence (PL) measurements. The shape...

  • The effect of two-temperature capping on germanium/silicon quantum dots and analysis of superlattices so composed. Vandervelde, Thomas E.; Kai Sun; Merz, James L.; Kubis, Alan; Hull, Robert; Pernell, Timothy L.; Bean, John C. // Journal of Applied Physics;6/15/2006, Vol. 99 Issue 12, p124301 

    It is well documented that quantum dots (QDs), grown and subsequently buried under silicon at temperatures greater than 400 °C, flatten into a pancakelike shape. Although QD arrays in Si superlattices have been studied for more than a decade, the process of flattening is not well understood....

  • Luminescence Stability of the Silica Encapsulated CdSe Quantum Dots. Xingping Zhou; Xiaqin Wang; Fuxian Liu; Zhilong Chen; Kasuya, Atsuo // Current Nanoscience;Feb2008, Vol. 4 Issue 1, p88 

    Silica encapsulated CdSe quantum dots (QDs) with a relatively strong photoluminescence were prepared using 3-mercaptopropyl trimethoxysilane by Stöber method at room temperature. The effect of pH of the physiological saline on the photoluminescence was investigated while the nanocomposites...

  • Tuning photoluminescence of reduced graphene oxide quantum dots from blue to purple. Fuchi Liu; Tao Tang; Qian Feng; Ming Li; Yuan Liu; Nujiang Tang; Wei Zhong; Youwei Du // Journal of Applied Physics;2014, Vol. 115 Issue 16, p164307-1 

    Reduced graphene oxide quantum dots (rGOQDs) were synthesized by annealing GOQDs in H2 atmosphere. The photoluminescence (PL) properties of GOQDs and the rGOQDs samples were investigated. The results showed that compared to GOQDs, a blue to purple tunable PL of rGOQDs can be obtained by...

  • Enhanced stability and emission intensity of aqueous CdTe/CdS core-shell quantum dots with widely tunable wavelength1. Wang, Hongyu; Xu, Ling; Liu, Ni; Zhang, Renqi; Xu, Jun; Su, Weining; Yu, Yao; Ma, Zhongyuan; Li, Wei; Chen, Kunji // Canadian Journal of Physics;Jul2014, Vol. 92 Issue 7/8, p802 

    The stability and photoluminescence (PL) emission intensity of quantum dots (QDs) are particularly interesting for various bioapplications. In this paper, monodisperse CdTe/CdS core-shell QDs were synthesized in aqueous phase. The size of CdTe core and the thickness of CdS shell played important...

  • Highly Sensitive Ultraviolet Photodetectors Fabricated from ZnO Quantum Dots/Carbon Nanodots Hybrid Films. Deng-Yang Guo; Chong-Xin Shan; Song-Nan Qu; De-Zhen Shen // Scientific Reports;12/12/2014, p1 

    Ultraviolet photodetectors have been fabricated from ZnO quantum dots/carbon nanodots hybrid films, and the introduction of carbon nanodots improves the performance of the photodetectors greatly. The photodetectors can be used to detect very weak ultraviolet signals (as low as 12 nW/cm2). The...


Read the Article


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

Try another library?
Sign out of this library

Other Topics