Preparation and characterisation of extremely perfect isotopically pure and isotopically engineered semiconductors: their physical properties

Informations projet

N° de convention de subvention: INTAS-93-1379

Projet clôturé

Date de début 1 Octobre 1994

Date de fin 30 Septembre 1995

Financé au titre de

• International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993-

Coût total € 0,00

Contribution de l’UE € 23 000,00

Coordonné par

MAX-PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany

Objectif

This project will explore the mechanisms of interaction of phonons in solids with an extremely high chemical, structural and isotopical purity and also with tailor-made isotopic compositions. The first step is the fabrication of the single crystals of germanium containing 99.9 % of 70Ge and the study of its thermal conductivity as a function of the temperature, the direction of heat flux and the density of injected charge carriers. In a later stage, 28Si will be prepared and its thermal conductivity will be studied under the conditions mentioned above.

The project aims to reach the record absolute value of the thermal conductivity (because of the high isotopical purification of the sample) and on the basis of the comparison with the theoretical calculations, to solve very delicate questions concerning the interactions of phonons with each other and with various quasi-particles of the crystal.

Using the same crystals the project will also study the isotopic dependence of the optical properties of solids. Among other things the effect of isotope concentration and disorder on electronic and vibronic excitations will be investigated. Luminescence and Raman scattering will be used in order to characterise the single crystals so obtained. Very accurate measurements of the lattice parameter will also be carrried out.

Programme(s)

• IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993-

Thème(s)

• 15 - Condensed Matter Physics

Appel à propositions

Data not available

Régime de financement

Data not available

Coordinateur

MAX-PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.

• Contribution de l’UE: Aucune donnée
• Adresse: heisenbergstrasse 1 ; D-70569 STUTTGART ; Allemagne
• Coût total: Aucune donnée

Participants (2)

Russian Research Centre I.V. Kurchatov Institute

Russie

• Contribution de l’UE: Aucune donnée
• Adresse: 123182 Moscow
• Coût total: Aucune donnée

Universidad de Valencia

Espagne

• Contribution de l’UE: Aucune donnée
• Adresse: 46100 Burjasot, Valencia
• Coût total: Aucune donnée