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Perovskite Solar Cells Conversion Efficiency Improves 20%

Author: Source: Datetime: 2016-11-13 07:58:57
solar cellResearchers at the Lawrence Berkeley National Laboratory at the University of California, Berkeley, recently published an article in Nature Materials. The article pointed out that the researchers redesigned the perovskite solar cells, solar cells of this kind of photoelectric conversion efficiency to 20% or more.

Perovskite solar cells is a combination of organic materials and inorganic materials into a new type of solar power batteries cells, and monocrystalline silicon / polycrystalline silicon / thin film solar cells, are solar energy into electrical energy devices. Compared to other types of solar cells, perovskite solar cells are low cost, inexpensive to manufacture, and flexible. However, due to its low photoelectric conversion efficiency, the advent of a short time, always stay in the field of research, not in the market.

Semiconductor materials, such as silicon and perovskite crystals, generate electricity when exposed to light of a specific wavelength, which is the core of solar cells. Previously, the researchers used a perovskite crystal material absorption of visible light into electricity, solar cells produced by the efficiency is relatively low. The researchers will absorb two different wavelengths of semiconductor combination, so that the solar cell by absorbing visible light, to absorb all the sunlight, making the efficiency of solar cells greatly enhanced.

The new solar cell uses atomic-thickness boron nitride to separate two different types of perovskite crystals. The researchers added graphene airgel at the bottom of the perovskite, on the one hand, to prevent water from destroying the crystal structure in the air, On the other hand, it utilizes the conductivity of graphene. In the upper layer of perovskite, is the active layer of solar cells.

After the test, the new solar powered portable generator cell photoelectric conversion efficiency of the peak close to 26%, an average of 21.7%.

"The perovskite batteries we have developed are the best of all currently available perovskite batteries," says Alex Zettl, a professor of physics at the University of California, Berkeley. "All the previous research We have not yet carried out in-depth optimization, photoelectric conversion efficiency has been very impressive, and can be expected after the depth of this solar cell optimization potential.
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