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A Japanese institute announced that that it confirmed a cell conversion efficiency of 17.7% by using a CIGS solar cell made with a flexible substrate.
The efficiency of the solar cell, which was developed by Japan's National Institute of Advanced Industrial Science and Technology (AIST), is one of the highest in the world for a flexible CIGS solar cell.
The production of a flexible CIGS solar cell has thus far faced an issue in the formation of a p-type semiconductor, according AIST. The carrier density of a p-type semiconductor in a CIGS solar cell is controlled by adding an alkali metal such as sodium.
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