Laser-assisted transparent material made of new UV solar cells

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

Results of Time-resolved Photoelectron Spectroscopy of Heterostructures (Source: University of Tokyo)

The release said it found the possibility of synthesizing the metal oxide heterostructures that best fit the desired optical function as needed. This is the result of research by three members of the Tokyo University (Associate Professor Matsuda Tan, Research Institute of Properties), Japan's High Energy Accelerator Research Organization (Professor Hiroshi Uguchi) and Tokyo Institute of Technology (Assistant Professor Ozawa Ozawa).

As a new generation of electronic components, metal oxides have drawn much attention. The surface of strontium titanate (SrTiO3) is known as a unique electronic material. But so far there is almost no report on the surface optical response. The clear that you can control the optical response.

By means of the precise crystal growth technique using the atomic level of the laser, several atomic thick strontium ruthenate (SrRuO3) layers are grown on the SrTiO3 crystal substrate to form heterostructures.

From the film thickness of SrRuO3, it was found that the optical response can be arbitrarily controlled.

The use of high intensity soft X-ray beams from SPring-8, a large synchrotron radiation facility in Hyogo, to measure photoelectron spectroscopy (experimental methods for illuminating metals and semiconductors) and finding out the electronic structure of solid surfaces based on the released electron energy , SrRuO3 film thickness due to different, SrRuO3 film electronic state by the semiconductor into a metal, along with SrTiO3 substrate carrier electron density from high to low.

Specifically, when the film thickness of SrRuO3 changes, the electronic structure of the heterogeneous interface changes drastically, and the corresponding optical response increases by 200 times, and the photoelectromotive force and the relaxation lifetime change sensitively.

According to the obtained results, the numerical simulation is carried out, and the amount of optical carrier and the power required for the optical response change are grasped. Thus, the occurrence of the photoelectromotive force of the oxide heterostructure and the control principle can be quantitatively explained.

SrTiO3 is a semiconductor material that transmits visible light but absorbs ultraviolet light. The thickness of the SrRuO3 layer is also only at the atomic level, and the transmittance of visible light is high. From these characteristics, it is expected to become a transparent and UV-resistant solar cell material.

The research results are scheduled to be published in the German academic journal Advanced Materials Interfaces on September 5 local time.

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