THE CONTROL AND EVALUATION OF BLUE-SHIFT IN GAINAS/GAINASP MULTIPLE-QUANTUM-WELL STRUCTURES FOR INTEGRATED LASERS AND STARK-EFFECT MODULATORS
| Autor: | Robin J. Nicholas, J. Thompson, Siu Ling Wong, N. J. Long, B Hamilton, Andrew G. Norman, K Scarrott, Robert W. Martin, G.R. Booker, A Chew, D.E. Sykes, R. E. Mallard, J M Jowett, Klaus Satzke, R E Pritchard, S A Galloway, E J Thrush |
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| Jazyk: | angličtina |
| Rok vydání: | 1993 |
| Předmět: |
Photoluminescence
Dopant Chemistry business.industry Doping Analytical chemistry Substrate (electronics) Condensed Matter Physics Electronic Optical and Magnetic Materials Blueshift symbols.namesake Stark effect Materials Chemistry symbols Optoelectronics Metalorganic vapour phase epitaxy Electrical and Electronic Engineering Dislocation business |
| Zdroj: | SEMICONDUCTOR SCIENCE AND TECHNOLOGY. 8(6) |
| ISSN: | 1361-6641 0268-1242 |
| Popis: | The authors report on the structural and optical characterization of nominally lattice-matched GaInAs/GaInAsP multiple quantum well (MQW) structures grown on (100) InP substrates by metalorganic chemical vapour deposition (MOCVD) which undergo a 'blue shift' in photoluminescence upon thermal annealing. Electron microscope and magneto-optical analyses show that the shifts are principally due to layer interdiffusion, which results in a change in composition of the well centres. These compositional variations are quantitatively measured by high-resolution analytical electron microscopy. This analysis demonstrates that the diffusion of the group V elements in the undoped MQWS is faster than that of the group III elements, resulting in the incorporation of excess coherency strain in the material. Analysis of a number of samples grown on a variety of substrates shows that the wavelength shift is particularly large when the substrates are S doped, although the substrate dopant does not participate directly in the diffusion mechanism. The authors attribute this behavior to the typically low dislocation density of S-doped substrates. They report, for the first time, a direct measurement of the correlation between the spatial variation in the magnitude of the blue shift and the presence of dislocations in the MQWS. |
| Databáze: | OpenAIRE |
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