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2015 MRS Spring Meeting


E5.01 - European Metrology Project for III-V Materials Based High Efficiency Multi-Junction Solar Cells


Apr 8, 2015 10:30am ‐ Apr 8, 2015 10:45am

Description

Since July 2014, thirteen European metrology organizations are collaborating to address some of the main metrological challenges faced by the developments of high�efficiency III-V Multi-Junction Solar Cells (MJSC). III�V MJSC structures are made of a high number of layers, which makes a pure experimental optimization difficult and expensive; this also limits the uncertainty of cell calibration due to the complexity of their spectral response. The project is structured in three distinct parts: 1) improved accuracy in materials and transport characterization for existing MJSC; 2) improved accuracy and repeatability in traceable efficiency characterization for MJSC cells with three or more junctions and finally, 3) metrology for advance concept such as coupling with thermoelectric, dilute nitride, quantum dots or growth on Silicon. Each part of the project will be presented, but our contribution will be centered on our initial results for the first part that is developing accurate and spatially resolved metrology to determine traceable and complete III -V material data sets. In particular, the accuracy of existing and emerging methods to measure electrical transport properties of III -V complex heterostructures will be presented in details with an emphasis on experimental determination of band-gap alignment, dopant distribution, carrier density, and series -resistances.

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