Japan's large number of sub-spot solar cells have achieved a unit conversion efficiency of 26.8%

At the 72-fold condenser, the quantum efficiency of the quantum dot solar cell developed by Professor Okada Tosaka of the University of Tokyo’s Advanced Science and Technology Research Center reached 26.8%. In the past, the highest conversion efficiency of this type of solar cell was 21.2% at a 1,000-fold spotlight.

Prof. Okada developed a cell with 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 are the data measured by the UL Taiwan laboratory using a 5mm square unit.

Prof. Okada used a new structure to suppress heat generation during spotlight while improving conversion efficiency. Compared with compound multi-junction solar cells, the advantage of the quantum dot solar cell with an intermediate band method is that the amount of current is large, but the amount of heat generated due to the current amount is increased. Therefore, there is a problem that output power decreases when the concentration magnification is increased.

Professor Okada then formed an InGaP layer on the quantum dot layer to absorb some of the light that had hit GaAs around the quantum dot. Since the quantum dot layer and the InGaP layer are connected in series, the amount of current can be reduced and the voltage can be increased.

In the future, Prof. Okada intends to increase the concentration ratio to confirm whether the effect of fever is decreasing. (Reporter: He Jiji, "Nikkei Electronics")

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