Tokyo University, recently announced the successful synthesis of a new material that can be made suitable for use in windows and other transparent and UV solar cells.

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Post said the possibility can find the most suitable for the synthesis of demand to achieve a desired optical functional metal oxide heterostructures. This is the University of Tokyo (Institute of rock properties Matsuda Associate Professor), findings Japan Energy Accelerator Research Organization (group head Professor Hiroshi) and the Tokyo Institute of Technology (Kenichi Ozawa assistant) trio.

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Metal oxides as a new generation of high-profile electronic component material, known for its representation of material strontium titanate (SrTiO3) surface is unique electronic properties. But so far almost no report on the surface of the optical response. This clearly can be arbitrarily controlled optical response. By the use of burning laser atomic level of precision crystal growth technique on SrTiO3 crystal substrate, growing a few ultra-thin film of strontium ruthenium atom thick (SrRuO3) layer, forming a heterostructure. And that, by the thickness of the SrRuO3 can arbitrarily control the optical response.

Hyogo use large synchrotron radiation facility "SPring-8" high-brightness soft X-ray beam, measuring photoelectron spectroscopy (light irradiation of metals and semiconductors, electronic energy released experimentally that the solid surface electronic structure) found , due to the different thickness of SrRuO3, the electronic state of the film will be made of a semiconductor SrRuO3 into metal, along with the carrier electron density SrTiO3 substrate will be from high to low. Specifically, when the film thickness changes SrRuO3, electronic structures will be drastic changes in the hetero interface, the corresponding optical response will increase 200-fold, etc., and the size and ease life will be sensitive to changes in light electromotive force.

Numerical simulation based on the results obtained, the optical response grasp the changes required amount and the optical carrier power. Thus, the quantitative description of the occurrence and control principle of photovoltaic oxide heterostructures. SrTiO3 is able to transmit visible laser 5000mw light, but ultraviolet absorbing semiconductor material, the thickness of the SrRuO3 layer only atomic level, high visible light transmittance. From these characteristics, production is expected to be transparent and UV solar cell materials.