Solar cell efficiency case [5]

Panasonic developed a solar cell with an efficiency of 24.7% in February 2018. The Japan Institute of Industrial Technology has confirmed this result. Panasonic says it is the world's most efficient crystalline silicon solar cell, with an actual area of ​​more than 100 square centimeters.

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        Panasonic developed a solar cell with an efficiency of 24.7% in February 2018. The Japan Institute of Industrial Technology has confirmed this result. Panasonic says it is the world's most efficient crystalline silicon solar cell, with an actual area of ​​more than 100 square centimeters.

        The battery performance announced by Panasonic this time is 0.8% higher than the previous figure. The battery still uses its HIT technology, has an area of ​​101.8cm2, the battery thickness is 98μm, the open-circuit voltage is 0.75V, the short-circuit current is 4.02A and the fill factor is 83.2%.

        Panasonic points out in the statement that in order to improve battery efficiency, the company primarily starts from three aspects: reducing composite losses, reducing light-absorbing losses, and reducing resistance losses. HIT cells reduce surface recombination loss thanks to a thin, high quality, amorphous silicon layer. This time, Panasonic has further improved the quality of the amorphous silicon film and reduced substrate destruction during growth, increasing the battery's open-circuit voltage from 0.748V to 0.75V. At the same time, Panasonic increased the battery's light absorption capacity by reducing the transmittance of the transparent conductive layer and the amorphous silicon layer, while increasing the short-circuit current from 38.9 mA / cm2 to 39 , 5 mA / cm2. Finally, increase the fill factor by increasing the shrinkage ratio of the electrode.

        It can be understood that the new HIT battery is not only more efficient but also has a thickness of only 98μm, which completely demonstrates the potential of this battery in reducing cost.

        After PERC, heterocyclic cells represented by HIT have become a hot topic in today's photovoltaic industry. Heterosexual cells will also appear in this year's pioneering projects and are expected to become the most popular solar photovoltaic technology in the next 2-3 years. This year, my country has also established a number of differentiated battery production lines, which have great potential for development in the future.

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