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) A single-handed, single-hole faucet means a faucet that has only one switch and is not adjustable. This type of faucet is either hot or cold, or a double-pipe mixture of water, but it can only choose one or the other, and the water temperature is not adjustable. Brass Faucets for basin including 3 types, basin mixers, cold water basin taps, self closing basin taps. These become the first choice products of engineering in international market and domestic market. Single lever basin mixer,Single lever basin faucet,Basin Faucet WENZHOU CHENKAI SANITARY WARE CO.,LTD , https://www.cnchenkai.com