The ultra triple-junction cell: high-efficiency solar cell for space applications

Solar cells suitable for the space environment must combine high efficiency, high energy density, and radiation hardness in a manufacturable design. As improvement in one performance parameter usually results in degradation in one or more of the remaining parameters, careful optimization is required to enhance overall performance. The ultra triple-junction cell developed by Spectrolab builds upon the established success of the fully qualified improved triple-junction cell currently in production. In the ultra triple-junction cell configuration, improved robustness and efficiency after radiation exposure augment a cell design that is expected to deliver 28% beginning-of-life efficiency in production.