New Know-how Reduces the Price of Excessive-Effectivity Photo voltaic Cells

High-Efficiency Solar Cells

St. Petersburg scientists have proposed know-how for manufacturing high-efficiency photo voltaic cells based mostly on A3B5 semiconductors built-in on a silicon substrate, which can improve the effectivity of the present photovoltaic converters by 1.5 occasions.

A bunch of St. Petersburg scientists has proposed and experimentally examined know-how for the fabrication of high-efficiency photo voltaic cells based mostly on A3B5 semiconductors built-in on a silicon substrate, which sooner or later might improve the effectivity of the present single-junction photovoltaic converters by 1.5 occasions. The event of the know-how was forecasted by the Nobel Laureate Zhores Alferov. The outcomes have been printed within the journal Photo voltaic Vitality Supplies and Photo voltaic Cells.

At present, with the speedy exhaustion of hydrocarbon gasoline reserves and a rising concern about environmental points, scientists are paying increasingly more consideration to the event of the so-called “inexperienced applied sciences”. One of the well-liked matters within the discipline is the event of photo voltaic vitality applied sciences.

Nevertheless, wider use of the photo voltaic panels is hindered by various elements. Standard silicon photo voltaic cells have a comparatively low effectivity — lower than 20%. Extra environment friendly applied sciences require far more complicated semiconductor applied sciences, which considerably will increase the value of the photo voltaic cells.

The St. Petersburg scientists have proposed an answer to this drawback. The researchers from ITMO College, St. Petersburg Educational College and the Ioffe Institute confirmed that A3B5 buildings may very well be grown on cheap silicon substrate, offering a lower within the value of multi-junction photo voltaic cells.

“Our work focuses on the event of environment friendly photo voltaic cells based mostly on A3B5 supplies built-in on silicon-substrate,” feedback Ivan Mukhin, an ITMO College researcher, head of a laboratory at Educational College and a co-author of the research. “The principle issue within the epitaxial synthesis on silicon-substrate is that the deposited semiconductor should have the identical crystal lattice parameter as silicon. Roughly talking, the atoms of this materials needs to be on the identical distance from one another as are the silicon atoms. Sadly, there are few semiconductors that meet this requirement — one instance is gallium phosphide (GaP). Nevertheless, it’s not very appropriate for the fabrication of the photo voltaic cells because it has poor sunlight-absorbing property. But when we take GaP and add nitrogen (N), we acquire an answer of GaPN. Even at low N concentrations, this materials demonstrates the direct-band property and is nice at absorbing gentle, in addition to having the aptitude to be built-in onto a silicon substrate. On the identical time, silicon doesn’t simply function the constructing materials for the photovoltaic layers — it itself can act as one of many photoactive layers of a photo voltaic cell, absorbing gentle within the infrared vary. Zhores Alferov was one of many first to voice the thought of mixing ASB5 buildings and silicon.”

Working on the laboratory, the scientists had been in a position to acquire the highest layer of the photo voltaic cell, built-in onto a silicon substrate. With a rise of the variety of photoactive layers the effectivity of the photo voltaic cell grows, as every layer absorbs its a part of the photo voltaic spectrum.

As of now, the researchers have developed the primary small prototype of a photo voltaic cell based mostly on the A3B5 on silicon-substrate. Now they’re engaged on the event of the photo voltaic cell that will include a number of photoactive layers. Such photo voltaic cells will probably be considerably more practical at absorbing daylight and producing electrical energy.

“We’ve realized to develop the topmost layer. This materials system can doubtlessly even be used for intermediate layers. If you happen to add arsenic, you acquire quaternary GaPNAs alloy, and from it a number of junctions working in several elements of the photo voltaic spectrum might be grown on a silicon substrate. As demonstrated in our earlier work, the potential effectivity of such photo voltaic cells can exceed 40% underneath gentle focus, which is 1.5 occasions increased than that of contemporary Si applied sciences,” concludes Ivan Mukhin.

Reference:”GaNP-based photovoltaic gadget built-in on Si substrate” by Liliia N.Dvoretckaia, Alexey D.Bolshakov, Alexey M.Mozharov, Maxim S.Sobolev, Demid A.Kirilenko, Artem I.Baranov, Vladimir Mikhailovskii, Vladimir V.Neplokh, Ivan A.Morozov, Vladimir V.Fedorov, Ivan S.Mukhin, 25 December 2019, Photo voltaic Vitality Supplies and Photo voltaic Cells.
DOI: 10.1016/j.solmat.2019.110282

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