Dye-sensitized Solar Cell Progress
Recently, the Chinese Academy of Sciences, Changchun Institute of Applied Chemistry of Polymer Physics and Chemistry, State Key Laboratory of Swiss scientists in cooperation with researchers and Wang Peng, the dye-sensitized solar cell research has made important progress, relevant results in the June 29 online issue of the internationally renowned scientific journal “Nature - Materials” (Nature Materials) on.
Current dye-sensitized solar cells under test conditions in the air mass 1.5G power conversion efficiency has reached 11.1%, but this device is to use high-volatile, highly toxic cyanide electrolyte, greatly hindered the process actually used. Non-volatile at room temperature ionic liquids as to solve the problem program provides an important, but high viscosity ionic liquid, the Huodeqijian’s not efficient enough.
Peng and his collaborators through a variety of solid salt mixture to achieve the system by solid-liquid phase transition entropy to gain room temperature ionic liquids (China Patent Application No.: 200710306662.1). This greatly broadens the concept of a total of molten ionic liquid material selection. More importantly, based on these solid-state ionic materials with high lattice energy of molten liquid at room temperature ionic liquids than conventional lower viscosity and higher conductivity. To room temperature ionic liquids were prepared by melting the solar cell power conversion efficiency of 8.2%, setting a solvent-free dye-sensitized solar cells a world record in the device accelerated aging test conditions, exhibited excellent stability. They also adopted the system of ion mobility and viscosity of association, amendments to the classical Stokes - Einstein equation, to clarify the three iodine ions in the ionic liquid in addition to traditional physical diffusion transport, there are physical diffusion coupling electronic exchange mechanism. Also the first time they observed in the mesoporous conductor of electron transport by the relaxation of cations. This research will greatly promote the flexible dye-sensitized solar cell commercialization for portable electronic devices (such as mobile phones, music players, digital cameras, laptops, etc.) to provide new energy. Expert review of this work was praised as “a breakthrough work.”
The project supported by the National Natural Science Foundation, Chinese Academy of Sciences “Hundred Talents” and the major national research schemes.
Via: Dye-sensitized Solar Cell Progress
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