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Towards Ordered, Uniformly-Sized ZnO Single-Crystal Nanorod Arrays
Huijuan Zhou,Markus Wissinger,Johannes Fallert,Robert Hauschild,Felix Stelzl,Mario Hauser,Janos Sartor,Claus Klingshirn,Heinz Kalt 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
By using a catalyst-assisted vapor phase deposition method, we recently fabricated high-quality ordered ZnO nanorod arrays with uniform rod size. The rods, grown perpendicularly on GaN/Al2O3 substrates, were [0001]-oriented single crystals with diameters of 200 nm, length of 4.7 µm, and rod-to-rod spacings of 500 nm. The growth conditions, including the choice of the substrate, the patterning of the catalyst on the substrate, and the growth parameters, played important roles in determining the morphology of the rods, and the best samples were produced under optimized conditions. Time-resolved micro-photoluminescence measurements on single nanorods demonstrated laser emission at temperatures up to room temperature. These high-crystal-quality nanorod arrays may be promising candidates for ultraviolet nanolaser arrays.
Measurements of the External Luminescence Quantum Efficiency of Zinc Oxide
Mario Hauser,Alexander Hepting,Robert Hauschild,Markus Wissinger,Huijuan Zhou,Felix Stelzl,Johannes Fallert,Heinz Kalt,Claus Klingshirn 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We report on the measurement of the absolute external luminescence quantum efficiency that is directly accessible using a miniature integrating sphere fitted into a cryostat. Various measurements have been carried out on high quality laboratory bulk samples and dierent commercially available ZnO powders from 10 K up to room temperature. A fit to the temperature dependent quantum efficiency shows the existence of various activated processes. We report on the measurement of the absolute external luminescence quantum efficiency that is directly accessible using a miniature integrating sphere fitted into a cryostat. Various measurements have been carried out on high quality laboratory bulk samples and dierent commercially available ZnO powders from 10 K up to room temperature. A fit to the temperature dependent quantum efficiency shows the existence of various activated processes.
Dynamics of Stimulated Emission in Single ZnO Nanorod Resonators
Johannes Fallert,Felix Stelzl,Huijuan Zhou,Markus Wissinger,Mario Hauser,Claus Klingshirn,Heinz Kalt,Dong Sik Kim,Margit Zacharias,Anton Reiser,Klaus Thonke,Rolf Sauer 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
ZnO nanorods grown via vapor transport methods have been studied under high optical excitation. Via a focused ion beam (FIB), particular nanorods have been marked on the substrate for optical measurements on as-grown single rods. In the particular nanorods, stimulated emission occurs above a certain excitation threshold. A time-resolved measurement of the single nanorod emission is accomplished by the use of a streak-camera. We focus on the typical lasing dynamics, which is found in these measurements on several samples. We explain the complex dynamics after pulsed excitation, which is caused by the interplay of gain competition among several lasing modes, the bandgap renormalization, and the carrier-density-dependent refractive index.