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V. Consonni,G. Feuillet 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
A study of the structural and the optical properties has been carried out before, upon, and after the coalescence of Cl-doped CdTe islands. Coalescence is found to induce high tensile stresses with the formation of grain boundaries. These stresses are eventually relaxed through the generation of compressive stresses related to the segregation of Cl atoms in the vicinity of grain boundaries. These segregation phenomena also influence the compensation mechanisms: a preferential formation of β acceptor complexes instead of A centers is directly observed by cathodoluminescence measurements. Furthermore, the coalescence and the post-coalescence stresses contribute to an orientation-dependent driving force for the grain growth, which leads to a progressive texturation of the material.
Photoluminescence Dynamics in ZnO Nanorods
I. C. Robin,B. Gauron,M. Rosina,P. Ferret,C. Tavares,G. Feuillet,Le Si Dang,B. Gayral,J. M. Gera 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Low-temperature cathodoluminescence and temperature-dependent time-resolved photoluminescence are used to investigate the emission properties of ZnO nanowires grown by using metal organic vapor-phase epitaxy. In particular, temperature-dependent decay-time measurements show that at temperatures up to room temperature, the escape toward non-radiative channels is limited in the ZnO nanowires. Low-temperature cathodoluminescence and temperature-dependent time-resolved photoluminescence are used to investigate the emission properties of ZnO nanowires grown by using metal organic vapor-phase epitaxy. In particular, temperature-dependent decay-time measurements show that at temperatures up to room temperature, the escape toward non-radiative channels is limited in the ZnO nanowires.
I. C. Robin,A. Jouini,C. Tavares,J. Rothman,G. Feuillet,D. Ehrentraut,T. Fukuda 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Homoepitaxial layers grown by liquid phase epitaxy on hydrothermally grown ZnO bulk wafers are studied by means of temperature-dependent photoluminescence. The properties of the films are compared to those of hydrothermal ZnO substrates. The effect of Ga doping is studied. Liquid phase epitaxy is shown to be a promising method for achieving substantial variations of the electrical and the luminescent properties of ZnO.
A Cost/Worth Approach to Evaluate UPFC Impact on ATC
Rajabi-Ghahnavieh, Abbas,Fotuhi-Firuzabad, Mahmud,Shahidehpour, Mohammad,Feuillet, Rene The Korean Institute of Electrical Engineers 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
Available transfer capability (ATC) is a measure of the transfer capability remaining in a transmission system. Application of unified power flow controllers (UPFCs) could have positive impacts on the ATC of some paths while it might have a negative impact on the ATC of other paths. This paper presents an approach to evaluate the impacts of UPFCs on the ATC from a cost/worth point of view. The UPFC application worth is considered as the maximum cost saving in enhancing the ATC of the paths due to the UPFC implementation. The cost saving is considered as the cost of optimal application of other system reinforcement alternatives (except for UPFC) to reach the same ATC level obtained by UPFC application. UPFC application costs include the maximum cost of alleviating the probable negative impact on the ATC of some paths caused by implementing UPFCs. Optimal system reinforcement is used for systems with UPFCs to determine the aforementioned cost. The proposed method is applied to the IEEERTS and the results are evaluated through a sensitivity analysis. The cost/worth of UPFC application is also used to develop an index for optimal UPFC location and the results are compared with those of other indices. A comparison is finally made with the results obtained using an existing ATC allocation profit-based approach to determine UPFC application worth.
A Cost/Worth Approach to Evaluate UPFC Impact on ATC
Abbas Rajabi-Ghahnavieh,Mahmud Fotuhi-Firuzabad,Mohammad Shahidehpour,Rene Feuillet 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
Available transfer capability (ATC) is a measure of the transfer capability remaining in a transmission system. Application of unified power flow controllers (UPFCs) could have positive impacts on the ATC of some paths while it might have a negative impact on the ATC of other paths. This paper presents an approach to evaluate the impacts of UPFCs on the ATC from a cost/worth point of view. The UPFC application worth is considered as the maximum cost saving in enhancing the ATC of the paths due to the UPFC implementation. The cost saving is considered as the cost of optimal application of other system reinforcement alternatives (except for UPFC) to reach the same ATC level obtained by UPFC application. UPFC application costs include the maximum cost of alleviating the probable negative impact on the ATC of some paths caused by implementing UPFCs. Optimal system reinforcement is used for systems with UPFCs to determine the aforementioned cost. The proposed method is applied to the IEEERTS and the results are evaluated through a sensitivity analysis. The cost/worth of UPFC application is also used to develop an index for optimal UPFC location and the results are compared with those of other indices. A comparison is finally made with the results obtained using an existing ATC allocation profit-based approach to determine UPFC application worth.
I. C. Robin,C. Tavares,J. Rothman,G. Feuillet,A. H. El-Shaer,A. Bakin,A. Waag,Le Si Dang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The structural and the spectroscopic properties of a 2-inch ZnO epilayer grown by using molecular beam epitaxy are investigated. A 500-nm-thick substrate was grown on c-sappire by using a MgO buffer. In spite of the high dislocation density in the epilayer, temperature-dependent photoluminescence measurements show only a small decrease in the luminescence intensity between 4 K and 300 K. Time-resolved photoluminescence measurements reveal a decay time independent of temperature. Cathodoluminescence presents an inhomogeneous emission on a micrometric scale: a stronger emission is measured in small nanometric areas. A tentative explanation of this behavior is proposed.