Finland's breakthrough conversion to 22 black silicon solar cells. 1%

Solar photovoltaic solar cells to promote efficiency, best can always is opposite to the sun, but to do that, will have to install chasing the sun where a device is expensive and can increase the system complexity, and materials scientists thought of another way, is developed on the surface of nanostructures is like a sword mountainous special silicone material, so no matter from which Angle can absorb sunshine, and so appear black in particular, this material called & other; Black silicon & throughout; ( 黑硅) 。

black silicon sounds like a good idea to solve the problem of Angle, not only can save the cost of antireflective coating, but no actual development envisioned to good effect, the main reason is that the photons in the structure of silicon solar cells with electrons and holes, there is a certain probability electron will back without producing electricity, this phenomenon is called optical carrier composite ( 重组载体) , and the incidence of this phenomenon is proportional to the silicon surface area, it is conceivable that because of the sword of black silicon mountain structure, large surface area, high loss rate of the carrier recombination, losses as high as 5 into experimental results in the past, made of black silicon conversion efficiency is lower than the general solar cell instead.

in order to reduce such a deadweight loss, the Finnish research team at the university of trust, on the surface of the black silicon adding a layer of aluminum film, to suppress the light carrier composite phenomenon, originally 5 into the loss rate fell to only 4%, moreover also integrate all the metal contact at the back of the solar cell, in order to increase the area of light, in tests, this new structure promotes the black silicon solar cell conversion efficiency of almost 4%, up to 22. 1%, a record of black silicon solar cells.

although the silicon solar cell conversion rate record and gap, but the research team believes that the black silicon in practical application, due to better use in the evening sun tilt, so down all day electricity performance will be better, on the other hand, the team also believe that the performance of the highest potential, not black silicon in the future to find a better way of structure and material combination, also can further improve conversion rates.

al commissioned at the university of new discovery, let black silicon concept turnaround, also is a reminder of the human, the solar cell in technical areas leave much to be further explored.

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