A schematic diagram of a novel hole transport material FDT that moves on crystallization of the perovskite material (lower square pyramid) Researchers at the Swiss Federal Institute of Technology in Lausanne (EPFL) announced that they have developed technologies that can produce perovskite solar cells with conversion efficiencies as high as 20.2% at significantly lower costs than before. The related papers were published in the academic journal Nature Energy. The conversion efficiency of perovskite solar cells has recently increased significantly. In the near future there are also researchers who claim that the conversion efficiency has reached 21.0%. The prototype of a perovskite solar cell is a dye-sensitized solar cell composed of titanium oxide, a dye, and the like. The difference is that perovskite solar cells use perovskite materials instead of “dyeâ€, and hole transport (HTL) materials do not use iodine solutions, and most use special materials such as Spiro-OMeTAD. In fact, this HTL material is the biggest topic. The perovskite material used in perovskite solar cells is made of lead (Pb) and organic materials, which is relatively inexpensive, while the HTL material is very expensive, and it costs 300 euros for 1 g. The Federal Institute of Technology in Lausanne used the "FDT" material, which is cheaper and only 1/5 of the existing HTL material for perovskite solar cells, achieving a conversion efficiency of 20.2%. "The FDT material is simpler to synthesize than the original HTL material and its purity is also easy to increase" (Mohammad Nazeeruddin, EPFL). (Reporter: Nozawa Tetsuo) Single Handle Sink Kitchen Mixer Faucet Kitchen Sink Taps is an economic Kitchen Faucet, Single handle operate and cold valve core design. Outlet pipe can be 360 ° rotation, bubbler outlet water more lively and comfortable. Kitchen sink mixer is suitable for all kinds of kitchen sinks, single hole deck mounted installation.And the use of high-quality spool, you can also customize your favorite color Single Handle Sink Kitchen Mixer Faucet,Single Handle Sink Kitchen Mixer,Single Handle Sink Kitchen Faucet,Single Handle Sink Kitchen Mixer Taps WENZHOU CHENKAI SANITARY WARE CO.,LTD , https://www.cnchenkai.com