Abstract Recently, the Massachusetts Institute of Technology researchers have developed a new method for coating the nanowires on a flexible graphene sheets. This method produces low-cost, transparent, and flexible solar cells that can be used on the surfaces of windows, roofs, and other objects. ...
Recently, researchers at the Massachusetts Institute of Technology have developed a new method for coating nanowires on flexible graphene sheets. This method produces low-cost, transparent, and flexible solar cells that can be used on the surfaces of windows, roofs, and other objects. The latest research was published in the recent issue of Nano Express, co-authors including MIT's postdoctoral members Park Hye-Sing and Zhang Shenggen (transliteration), associate professor of materials science and engineering, Servijie Gretke, and others. Eight researchers from the Massachusetts Institute of Technology.
At present, most solar cells are made of silicon, and since silicon needs to be highly purified and then crystallized and sliced, the price has been relatively expensive. Many researchers are exploring alternatives to silicon, such as nanostructures or hybrid solar cells, while indium tin oxide (ITO) is a transparent electrode used in these new solar cells.
“At present, ITO is the first choice for transparent electrode materials, such as on touch-screen smartphones, but the price of indium is high in this compound, while graphene is made up of ubiquitous, low-cost carbon. ."
Gretke said that graphene may be a new material to replace ITO. In addition to lower cost, it also has advantages such as good flexibility, light weight, high mechanical strength and chemical stability.
Due to the stability and inert structure of graphite, it is highly challenging to construct semiconductor nanostructures directly on the surface of pure graphene without affecting its electrical properties and structure. So Gretke and his team used a series of polymer coatings to change the properties of graphene to bond the zinc oxide nanowire layer and then cover the sulfide quantum dots in response to light waves or a type of A material polymer for P3HT.
“There is still a change in the innate properties of graphene, which is a composite material with significant advantages,†said Mr.
The MIT team has confirmed that the electrodes based on graphene and ITO are comparable in efficiency. In the case of covering sulfide quantum dots, although the power conversion efficiency of graphene is 4.2% lower than that of a general-purpose silicon battery, it will be competitive in special applications in the future.
In addition, the first author of the study, Zhang Shenggen, a postdoctoral fellow in the Department of Materials Science and Engineering at the Massachusetts Institute of Technology, said that unlike other semiconductors that have been continuously elevated in temperature, the graphite electrode of coated zinc oxide nanowires can control the temperature to 175. Below Celsius.
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