Six junction solar cell reaches 47 per cent efficiency: Page 2 of 2

April 14, 2020 //By Nick Flaherty
NREL researchers Ryan France (left) and John Geisz fabricated a solar cell that is nearly 50% efficient. Photo by Dennis Schroeder, NREL
A six junction III-V solar cell reaches 47 per cent efficiency for space and solar concentrator applications
silicon cell. You use a lot less semiconductor material by concentrating the light. An additional advantage is that the efficiency goes up as you concentrate the light.”

France described the potential for the solar cell to exceed 50 per cent efficiency as “actually very achievable.” Dual junction silicon and tandem perovskite solar cells are currently at 28 per cent efficiency.  

Geisz said that currently the main research hurdle to exceeding 50 per cent efficiency is to reduce the resistive barriers inside the cell that impede the flow of current. Meanwhile, he notes that NREL is also heavily engaged in reducing the cost of III-V solar cells, enabling new markets for these highly efficient devices.

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