Zhang, Qiang and Atay, Tolga and Tischler, Jonathan R. and Bradley, M. Scott and Bulovic, Vladimir and Nurmikko, A. V. (2007) Highly efficient resonant coupling of optical excitations in hybrid organic/inorganic semiconductor nanostructures. NATURE NANOTECHNOLOGY, 2 (9). pp. 555-559.
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Official URL: http://www.nature.com/nnano/journal/v2/n9/abs/nnan...
The integration of organic and inorganic semiconductors on the nanoscale offers the possibility of developing new photonic devices that combine the best features of these two distinct classes of material. Such devices could, for example, benefit from the large oscillator strengths found in organic materials and the nonlinear optical properties of inorganic species. Here we describe a novel hybrid organic/inorganic nanocomposite in which alternating monolayers of J-aggregates of cyanine dye and crystalline semiconductor quantum dots are grown by a layer-by-layer self-assembly technique. We demonstrate near-field photon-mediated coupling of vastly dissimilar optical excitations in the two materials that can reach efficiencies of up to 98% at room temperature. By varying the size of the quantum dots and thus tuning their optical resonance for absorption and emission, we also show how the ability of J-aggregates to harvest light can be harnessed to increase the effective absorption cross section of the quantum dots by up to a factor of ten. Combining organic and inorganic semiconductors in this way could lead to novel nanoscale designs for light-emitting, photovoltaic and sensor applications(1-4).
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanochemistry
Physical Science > Photonics
|Deposited By:||Anuj Seth|
|Deposited On:||18 Dec 2008 16:49|
|Last Modified:||18 Dec 2008 16:49|
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