研究目的
To demonstrate higher solar conversion efficiencies using a monolithic, series-connected, six-junction inverted metamorphic structure under concentrated light.
研究成果
The study demonstrated 6J solar cells with record efficiencies under both global and direct terrestrial spectra. Very high quality junctions with nearly optimal bandgaps were achieved using an IMM design. Further reduction of the series resistance within this structure could realistically enable efficiencies over 50%.
研究不足
The practical considerations limit the realization of ultimate efficiencies, including non-ideal materials and interfaces that result in non-radiative recombination, refractive index differences that result in optical losses, and resistive losses.
1：Experimental Design and Method Selection:
The study employed a monolithic, series-connected, six-junction inverted metamorphic structure for solar conversion efficiency under concentrated light.
2：Sample Selection and Data Sources:
The samples were fabricated using alloys of III–V semiconductors.
3：List of Experimental Equipment and Materials:
The study used a custom-built, atmospheric-pressure OMVPE system for growth, and various materials including trimethylgallium, triethylgallium, trimethylaluminium, trimethylindium, arsine, phosphine, triethylantimony, dimethylhydrazine, diethylzinc, carbon tetrachloride, hydrogen selenide, and disilane.
4：Experimental Procedures and Operational Workflow:
The fabrication steps included OMVPE growth, photolithographic processing, and characterization by standard solar cell methods modified for six junctions.
5：Data Analysis Methods:
The study used external quantum efficiency (EQE) with simultaneous specular reflectance and J–V measurements under indoor solar simulators for characterization.
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