Objective
The aim of this project is thus to study the optical absorption, the expansion, the structural parameters, ultrasonic attenuation and propagation speeds as a function of temperature in monocrystals of the type I-II-VI2 semiconductors.
Monocrystals of CaInSe2, CuInTe2, CuGaSe2, CuGaS2, CuInS2 and AgInTe2 have been grown; the first 3 by the directional solidification method, the remaining 3 by the chemical transport method. High temperature X-ray diffraction studies were made on the compounds CuInTe2 and AgInTe2. The results are in the process of being analysed. The determination of the structure of a CuGaS2 monocrystal was also made so as to investigate the electron density in the crystal. A study of lattice vibrations in CuInSe2 and CuGaSe2 has been made to help resolve a controversy which appeared in the literature on the spectrum of vibration of these two compounds. The results obtained remove all ambiguity and have been submitted for publication. Measurements of optical transmission were made between 5 K and 300 K. For CuInTe2 the variations with temperature in the width of the forbidden band Eg were determined and the deformation potential was calculated. For CuGaS2 the position of the first excitonic level was determined as well as the variation with temperature of the midheight width of this peak.
Fields of science (EuroSciVoc)
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
59655 Villeneuve d'Ascq
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.