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RIKEN, the energy dissipation is less”topological current”demonstration of high-efficiency solar cell development to expect

Substances in the current through the impurities, based on factors such as the energy dissipates. The energy dissipation of the current as a”topological current”has been the focus of attention. Physical and chemical research [RIKEN], Japan Science and Technology Agency [JST]is 11, the topological current of the existence of proven success announced.

【Here】Optical and electronic relationships more clearly Tsukuba Research

■Quantum mechanical nature of the use of the topological current

Substances move through the charge scattering caused by impurities other than lattice defects and vibrations are considered. Normal current, so the charge of the scattering and energy dissipation to energy dissipation of the current mechanism is required.

Energy dissipation of the current, as the”superconductors”called at low temperatures the resistance is zero,the substances to move around the current candidate is considered as. But superconductors at very low temperature, because room temperature devices that operate in the realization of is difficult and.

Superconductors as an alternative to in recent years, notably,the topological current only. The electron wave phase changes by one direction resulting topological current is a superconductor different from room temperature is also feasible, however.

Topological currents as a potential candidate,the absorption of light by electrons emitted the”photoelectric effect”using the”photocurrent”can be considered. Ferroelectric, such as space inversion and structure of different materials,the external electric field without current generated from the photocurrent of a kind and demonstrate that the examples of this.

■The efficiency of the solar cell to develop a

RIKEN,JST,the University of Tokyo researchers from the group have paid attention to the”sulfide iodide antimony”called Substance. Typical strong derivatives,visible light is strongly absorbed in the semiconductor nature of having that.

Research group, sulfide, iodide of antimony in the crystal of the lattice defect, the photocurrent impact was investigated. The defect density of different sulfide iodide antimony available,a pseudo-sunlight irradiating the resulting photocurrent is measured. As a result, light is not irradiated state, the electrical conductivity is significantly different from that of irradiating light and the photocurrent is almost the same value turned out to be.

The study group further,various temperature experiment was conducted, where under light irradiation in the photoelectric current is almost the same, and the lattice defects, such as scattering for strong and proven. These results demonstrate a photocurrent to be used in an efficient solar cell development and research, the group is excited about.

Details of the study,”the Proceedings of the National Academy of Sciences of the United States of America”on the 11th, Online, posted. [Article: Kadono 未智・The article list to look at]


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