Obiettivo THE MAIN OBJECTIVE OF THIS R&D PROJECT IS THE ACHIEVEMENT OF HIGH CONVERSION EFFICIENCY OF SOLAR ENERGY. MULTIBANDGAP CELLS IN THE PRESENT PROJECT ARE EXPECTED TO GIVE CONVERSION EFFICIENCIES IN THE RANGE OF 30% UNDER 100-500 CONCENTRATION RATIO. THE PROPOSED PHOTOVOLTAIC QUADRISPECTRAL STRUCTURE IS COMPOSED OF TWO MONOLITHIC TANDEMS: (ALGAAS-GAAS) AND (GAINAS-GAINASP) AND MUST BE VIEWED AS A HIGH EFFICIENCY GAAS "MASTER" CELL TOGETHER WITH THREE "BOOSTER" CELLS: (AL,GA)AS, (GA,IN)AS AND (GA,IN)(AS,P) CELLS. AN OTHER AIM OF THIS PROJECT IS TO DEMONSTRATE THE POSSIBILITY OF REPLACING THE GAAS SUBSTRATE BY SI SUBSTRATES. DURING THIS YEAR THE FOLLOWING MAIN POINTS HAVE BEEN STUDIED: CHARACTERIZATION OF DX CENTERS IN (GA,AL)AS IN RELATION WITH THE PHOTOVOLTAIC QUALIFICATION OF THIS MATERIAL, FEASIBILITY OF TUNNEL JUNCTIONS FOR TANDEM INTER CELL OHMIC CONTACTS, CHARACTERISATION OF GAINASP CELLS, GAAS/SI HETEROSTRUCTURE STRUCTURAL AND ELECTRONIC BEHAVIORS IN RELATION WITH PHOTOVOLTAIC REQUIREMENTS. DX CENTERS ARISE FROM A PARTICULAR BAND STRUCTURE CONFIGURATION IN N-TYPE GA1-XALXAS FOR .2200 ACM E-2) HAVE BEEN MEASURED. BEHIND A GAAS FILTER, THE LPE GROWN GA.29IN.71AS.63P.37 CELL HAS AN EFFICIENCY OF 3.2% (AMO, C=1). SO AN EFFICIENCY OF 8% CAN BE OBTAINED THROUGH A BICOLOR SYSTEM INVOLVING A GAAS CELL ASSOCIATED WITH EITHER A (GA,IN)AS OR A (GA,IN)(AS,P) CELL UNDER 100 CONCENTRATION RATIO. (GA,IN)AS AND (GA,IN)(AS,P) LPE GROWN TUNNEL DIODES HAVE PEAK CURRENTS OF 95.5ACM-E2 AND 2.2 ACM-E2 RESPECTIVELY. CONCERNING THE HETEROEPITAXY OF GAAS ON SI SUBSTRATES, GROWTH CONDITIONS HAVE BEEN IMPROVED AND MATERIAL PHOTOVOLTAIC BEHAVIORS ARE REPRESENTATIVE OF THE CURRENT STATE OF THE ART (NTT AND SERI CARRIER LIFETIME RESULTS). ACM E-2 AND 2.2 ACM E-2 RESPECTIVELY. CONCERNING THE HETEROEPITAXY OF GAAS ON SI SUBSTRATES, GROWTH CONDITIONS HAVE BEEN IMPROVED AND MATERIAL PHOTOVOLTAIC BEHAVIORS ARE REPRESENTATIVE OF THE CURRENT STATE OF THE ART (NTT AND SERI CARRIER LIFETIME RESULTS). Campo scientifico natural sciencesphysical scienceselectromagnetism and electronicssemiconductivityengineering and technologyenvironmental engineeringenergy and fuelsrenewable energysolar energyphotovoltaic Programma(i) FP1-ENNONUC 3C - Research and development programme (EEC) in the field of Non-Nuclear Energy, 1985-1988 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore Centre National de la Recherche Scientifique (CNRS) Contributo UE Nessun dato Indirizzo Rue Bernard Grégory Parc de Valbonne Sophia Antipolis 06560 Valbonne Francia Mostra sulla mappa Costo totale Nessun dato
