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In 2012, a researcher at the University of Florida released a report saying that they deposited a layer of graphene doped with trifluoromethanesulfonyl-amide (TFSA) on a silicon wafer and used this silicon wafer to make a solar energy. Battery, the effective conversion rate of this solar cell can reach 8.6%. Now another team said they gave up using silicon instead of using a graphene-based material to make a solar cell. The solar cell measured an effective conversion rate of 15.6%, refreshing previous records.
Researchers from the Photovoltaic and Optoelectronic Device Group (DFO) formed by Universitat Jaume I and Oxford University in Spain have developed this photovoltaic device. They combined titanium dioxide and graphene as a charge collector. Then they used perovskite as a solar absorber. In addition to improving solar energy conversion, the team said the device was still manufactured at low temperatures. By embedding several layers of material, the research team can also use solution-based configuration techniques to handle it at temperatures below 150 degrees. This not only means lower potential production costs, but also means that this technology may also be used on flexible plastics.
The team’s research paper has been published in the journal Nano Letters.
Overshot go into the heart of the drill pipe, the slider move up, make the tube socket head can be inserted into the center, when on the slider move up tight, using friction lift drill, remove loose again after the slider, by means of the connection string to slide along the block should tighten, set aside the center pipe, but in front of the salvage must first determine the bit in the bottom of the hole position, can be in a thin plate with bolts tight end of drill pipe, Drop the drill pipe to the bottom of the hole and press it on the drill bit. After waiting for a moment, it is proposed that the relative position of the drill bit at the bottom of the hole and the center of the rotary plate of the drill can be determined by observing the indentation left by the center pipe of the drill bit on the board, and then move the drill or rotary plate so that the center of the rotary plate is directly in front of the center pipe of the injured head, so as to ensure that the fishing device can be inserted into the center pipe accurately.
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