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Multi junction silicon crystal solar cell efficiency exceeded 30%

Author: Source: Datetime: 2016-11-11 18:36:14

Silicon solar power batteries is the mainstream of solar power generation technology, but with the current large-scale commercialization of technology, the conversion efficiency is expected to be difficult to exceed 23%. Industry and research institutes continue to actively develop a variety of technologies to break through the efficiency of the ceiling, the latest public technology confirmed that solar cell efficiency can exceed 30%.


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Study on the German Fraunhofer solar system (ISE) and Austria EV Group company (EVG) cooperation, success to a silicon solar battery based solar cell technology, has joined the two electrodes more, make the conversion efficiency of solar cells has shot up to 30.2%.

 

Fraunhofer ISE and EVG, through direct wafer bonding technology (direct wafer bounding) 35 micron semiconductor material into silicon material; by plasma activation, cell surface of the epitaxial wafer (subcell) will present the vacuum joint, the 35 group electric atoms and silicon atoms on the surface of the pool closely joint formation battery with silicon based material.


Multi junction cell, which is composed of stacked indium gallium (GaInP), (GaAs), silicon (Si) and other three kinds of secondary batteries, can absorb a wider spectrum of solar light, and the conversion efficiency can be greatly improved. Fraunhofer ISE and EVG the success of the 35 semiconductor silicon material 4 / square centimeter area multi junction cell conversion efficiency increased to 30.2%, broke through the ceiling 29.4% theoretical efficiency silicon solar battery, and complete the inspection certificate by Fraunhofer laboratory.

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Fig. 35 current and voltage variation curves of multi junction solar cells in the semiconductor silicon / silicon materials. (source: Fraunhofer)

 

At present, the 35 semiconductor silicon / multi junction battery costs are still high, the 35 semiconductor epitaxial engineering and bonding techniques have reduced the cost of space. ISE Fraunhofer researchers said it would continue to study in order to promote the conversion efficiency of more than 30% of solar energy components in solar generator come out.


SHARP similar technology for artificial satellites and coffee

 

The same with multi junction technology to develop highly efficient solar cells, and SHARP of Japan (Sharp). SHARP in May this year, open with the Japanese NEDO research results, through the compound three bonding technology to create a conversion efficiency of 31.17% of solar photovoltaic cells, for the current global conversion efficiency of the highest technology.

 

SHARP's three joint compound cell layered InGaP, GaAs and InGaAs (InGaAs) three layer light absorbing structure, and a special tunnel junction layer and buffer layer with combination of them, the battery can absorb spectral absorption wider and higher efficiency.


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SHARP's compound three junction solar cell in solar backup generator, conversion efficiency record of 31.17%. (source: Sharp)

 

SHARP's 31.17% efficiency record, released in May, was achieved on a large battery of 986 square centimeters, while the same technology used to create 37.9% efficiency on a small area of 1.047 square centimeters.

 

In the past, SHARP apply this technology to the satellite, but in October this year, SHARP will be applied to the coffee chair, and combined with the USB and battery charging port, to create a special solar charging chair, has been set up in three Starbucks stores in Tokyo.

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