A recent discovery of American scientists panels blacks are much cheaper and more efficient
As we know, unlike the white, which reflects the projected light, black absorbs it. This is the basic concept that started the team of researchers led by Howard Brenz, who said they had been involved in the project since late 2006 when he attended a lecture by a researcher at the Technical University of Monaco and has recently wanted to verify his intuition. The team is part of NREL, National Renewable Energy Laboratory, U.S., discovered that for this year has won the award for best innovation.
The idea was to blacken the common silicon wafer typically used for photovoltaic panels in order to absorb all the light not only avoiding wastage but also exploiting the weak radiation of early morning and dusk, in fact, increasing the efficiency and effectiveness of the panel. Specifically, through a low-cost technique developed at the University of Monaco, the silicon discs (wafers) was sprinkled with a mixture of acids because of their corrosive action, have affected millions of holes on the surface. These holes are able to capture the light, making the surface black. German scientists, thanks to an evaporation technique with vacuum pumps, with a mixture of hydrogen peroxide and hydrofluoric acid have sprinkled a thin layer of gold inside the wafer, all dark. Unlike the German colleagues, the NREL team has decided to optimize the technique: they have sprinkled the surface of silicon with a solution of gold nanoparticles in suspension, called "colloidal gold" and have waited until the water evaporates so that gold, then incidesse the wafer. Subsequently, the chemist of the NREL Vern Yost, wanting to improve technique, has decided to separate the nanoparticles with aqua regia, a mixture consisting of equally corrosive nitric acid and concentrated hydrochloric acid capable of dissolving metals such as gold and silver. Well, the water director reacted with gold to form a solution chloroauric acid, colloidal gold cheaper.
The idea was to blacken the common silicon wafer typically used for photovoltaic panels in order to absorb all the light not only avoiding wastage but also exploiting the weak radiation of early morning and dusk, in fact, increasing the efficiency and effectiveness of the panel. Specifically, through a low-cost technique developed at the University of Monaco, the silicon discs (wafers) was sprinkled with a mixture of acids because of their corrosive action, have affected millions of holes on the surface. These holes are able to capture the light, making the surface black. German scientists, thanks to an evaporation technique with vacuum pumps, with a mixture of hydrogen peroxide and hydrofluoric acid have sprinkled a thin layer of gold inside the wafer, all dark. Unlike the German colleagues, the NREL team has decided to optimize the technique: they have sprinkled the surface of silicon with a solution of gold nanoparticles in suspension, called "colloidal gold" and have waited until the water evaporates so that gold, then incidesse the wafer. Subsequently, the chemist of the NREL Vern Yost, wanting to improve technique, has decided to separate the nanoparticles with aqua regia, a mixture consisting of equally corrosive nitric acid and concentrated hydrochloric acid capable of dissolving metals such as gold and silver. Well, the water director reacted with gold to form a solution chloroauric acid, colloidal gold cheaper.
According to the American laboratory, so the absorption of light by the solar cells increased by 98% against 95% of the current ones. Result of some trivial goal, but enough to increase energy efficiency by 2% of the cell. Not only that, the creation of black silicon panels using the technique of NREL is not harmful to the environment because it produces less emissions than current panels.
Source: edilone.it
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