WE PROPOSE A TOPIC 2 PROJECT THAT WILL RESULT IN A PHOTOVOLTAIC PV SOLAR CELL DESIGNED FOR EFFICIENT OPERATION ABOVE 25 AT TEMPERATURES ABOVE 400C WITHIN THREE YEARS. THE PRIMARY CONCEPT IS THE REALIZATION OF A HIGH TEMPERATURE HIGH EFFICIENCY TANDEM SOLAR CELL DEVICE BASED ON INGAN MATERIALS. AS IS WELL KNOWN THE INXGA1XN TERNARY COMPOUND SYSTEM HAS A RANGE OF BANDGAPS BASED ON THE MOLE FRACTION X OF IN THAT SPANS THE ENTIRE SOLAR SPECTRUM. FURTHERMORE NITRIDE BASED ELECTRONICS AND OPTOELECTRONICS ARE DEMONSTRATED TO OPERATE AT HIGH TEMPERATURES 400 C AND ARE THE BASIS FOR HIGH POWER HIGH TEMPERATURE ELECTRONICS. THEY ALSO SERVE AS THE BASIS FOR A RAPIDLY GROWING WHITE LIGHT EMITTING DIODE LED MARKET WITH WELL ESTABLISHED ROADMAPS FOR COST REDUCTION AND MANUFACTURABILITY. THE FOLLOWING KEY CHARACTERISTICS OF THE PROPOSED SOLAR CELL ALLOW HIGH EFFICIENCY AND HIGH TEMPERATURE OPERATION. A TWO JUNCTION INGAN BASED TANDEM SOLAR CELL STRUCTURE TO EXCEED THE NASA TARGET SOLAR CELL EFFICIENCY GOALS 25 OPERATING AT OR NEAR THE OPERATING TEMPERATURE OF THE SOLAR THERMAL SYSTEM. ADVANCED DEVICE STRUCTURES AND FABRICATION METHODS SUITABLE FOR HIGH TEMPERATURE OPERATION SUCH AS HIGH THERMAL STABILITY METAL CONTACT METALLURGY WITH LOW SPECIFIC CONTACT RESISTANCE AND ALL NITRIDE BASED SEMICONDUCTOR COMPONENTS. NOVEL HETEROSTRUCTURE CARRIER SELECTIVE CONTACT STRUCTURES IN THE ABSORBER LAYER TO INCREASE OPEN CIRCUIT VOLTAGE AND RELAX THE DOPING REQUIREMENTS IN THE PHOTOACTIVE REGIONS. THERMIONIC ESCAPE FROM SHALLOW QUANTUM WELLS QWS THAT ACHIEVES HIGH EFFICIENCY THROUGH INCREASED PHOTOCARRIER COLLECTION AT ELEVATED TEMPERATURES. A FLEXIBLE DEVICE TECHNOLOGY TO ALLOW FOR CONFORMAL MOUNTING OF THE SOLAR CELL DEVICE TO THE TARGET SOLAR THERMAL TECHNOLOGY AND REDUCE SUBSTRATE AND RELATED MATERIAL COSTS. ADVANTAGES THE PROPOSED III NITRIDE SOLAR CELL HAS NUMEROUS ADVANTAGES IF INTEGRATING INTO A CONCENTRATED SOLAR POWER CSP SYSTEM RELATING TO ITS PERFORMANCE COST SCALABILITY AND FEASIBILITY. FOR EXAMPLE THE PROPOSED INGAN SOLAR CELL ALLOWS A SYSTEM WITH HIGHER EFFICIENCY AND LOWER COSTS THAN ANY OTHER SOLAR BASED ELECTRICITY SYSTEM WHILE SIMULTANEOUSLY ALLOWING A LARGE FRACTION OF DISPATCHABLE ELECTRICITY THUS ADDRESSING THE MAJOR PRESENT DRAWBACK WITH PV SYSTEMS. FURTHERMORE THROUGH THE EXISTING LED INDUSTRY THE DEVICES HAVE ALREADY DEMONSTRATED RELIABILITY AND SCALABILITY. FINALLY THE ABILITY TO MAKE HIGH PERFORMANCE HIGHER BANDGAP INGAN SOLAR CELLS HAS ALREADY BEEN DEMONSTRATED. THESE ADVANTAGES ARE SUMMARIZED IN TABLE I OF THE FULL PROPOSAL. IMPACTS AND INFUSION THE DEVELOPMENT OF A HIGH EFFICIENCY INGAN SOLAR CELL ENABLES A TRANSFORMATIONAL CHANGE IN THE ABILITY TO EFFICIENTLY GENERATE POWER WITHOUT CONCERNS OF OPERATIONAL TEMPERATURES WHICH IS A KEY REQUIREMENT FOR SPACE APPLICATIONS. THE KEY ASPECTS OF THE APPROACH ARE TO CAPITALIZE ON THE UNIQUE PROPERTIES OF THE III NITRIDE MATERIALS SYSTEMS WHICH EXCLUSIVELY AMONG COMMERCIAL SEMICONDUCTORS ALLOW HIGH TEMPERATURE OPERATION. FURTHER WE CAPITALIZE ON THE RAPID GROWTH INDUSTRIES BASED ON THE III NITRIDES SUCH AS SOLID STATE LIGHTING WHICH DRIVES BOTH TECHNICAL INNOVATION AND REDUCED COSTS. A SUCCESSFUL OUTCOME OF THE RESEARCH WILL BE VERY BENEFICIAL TO VARIOUS NASA MISSIONS AS POWER GENERATION IS CRITICAL TO SPACE TECHNOLOGY ESPECIALLY FOR SCIENCE MISSION DIRECTORATE SMD MISSIONS FOCUSED ON DESTINATIONS CLOSER TO THE SUN. OTHER IMPACT INCLUDES ENABLES A TRANSFORMATIONAL CHANGE IN THE ABILITY TO INTEGRATE RENEWABLE ENERGY INTO THE ELECTRICITY GRID.