Japan's large number of sub-spot solar cell unit conversion efficiency reached 26.8%
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At a concentration level of 72 times, researchers from the University of Tokyo’s Advanced Science and Technology Research Center, led by Professor Okada Tosaka, have achieved a remarkable quantum efficiency of 26.8% in their quantum dot solar cells. This is a significant leap from the previous record of 21.2% at a concentration of 1,000 times for similar devices.
The new design features an open-circuit voltage of 2.05 V, a short-circuit current density of 1193.3 mA/cm², and a fill factor of 78.8%. These results were measured by the UL Taiwan laboratory using a 5mm square cell unit, showcasing the potential of this technology in real-world applications.
One of the key challenges with quantum dot solar cells is managing heat generation under high light concentration. Traditional multi-junction solar cells handle this better, but quantum dot cells offer higher current output. However, this also leads to increased heat, which can reduce power output when the concentration increases.
To address this issue, Professor Okada introduced an InGaP layer above the quantum dot layer. This layer helps absorb some of the light that would otherwise be absorbed by the GaAs layer, reducing the overall current and increasing the voltage. By connecting the quantum dot layer and InGaP layer in series, the system achieves a more balanced performance.
Looking ahead, Professor Okada plans to further increase the concentration ratio to test whether the heat-related performance drop can be minimized. This research could pave the way for more efficient and practical solar energy solutions in the future.
(Reporter: He Jiji, "Nikkei Electronics")