The National Renewable Energy Laboratory (NREL) under the U.S. Department of Energy announced that it has developed a photovoltaic cell with a conversion efficiency of 31.3%, setting a new record in the world. The photovoltaic cell uses a double-junction solar cell and is based on a solar radiation.
The original world record was created by Alta Devices, based in Sunnyvale, California, in March 2012. The conversion efficiency was 30.8%. The 0.25-cm2 III-V photovoltaic cell developed by NREL contains an indium gallium phosphide cell on top of a gallium arsenide solar cell, which is measured based on the AM1.5 global spectrum of 1000 watts per square centimeter.
Battery based IMM design
This type of photovoltaic cell is based primarily on NREL's heterogeneous (IMM) cell design. This design involves switching layers of the normal growth sequence, creating a transparent buffer layer to mitigate misalignment, and removing the main substrate to the secondary handle.
Battery from F-PACE project
NREL's development of such batteries is part of the US Department of Energy's "Promotion of Battery Efficiency Basic Projects" (F-PACE). F-PACE is a project that aims to reduce the cost of solar power generation under the SunShot initiative. The main goal is to create photovoltaic cells with a conversion efficiency of 48%.
NREL scientist Myles Steiner stated: "From a historical point of view, scientists have improved the performance of multi-cell batteries by gradually increasing the internal electrical properties of material quality and junctions and optimizing variables such as band gap and layer thickness."
However, NREL’s focus has been on internal optics. Steiner believes that the role of internal optics in the high quality of III-V photovoltaic cells is underestimated. He said: "The scientific goal of the project is to understand and use internal optics." Translator: Krystal
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