The polarized photoelectric crystal glass with non-central symmetric structures are based on the spontaneous polarization, which shows the excellent optical performance of nonlinear optics, piezoelectric, pyroelectric and ferroelectric. But only compounds that crystallize in a group of 10 polar points can have a polarizing effect.How to innovate the structure design of polarity photoelectric functional crystal materials, use primitive coordinated to realize the arrangement consistent of the dipole moment, and assembly with strong polarization properties of compound to obtain excellent photoelectric properties of crystal material on the macro has become an important scientific problems in this field.
Chinese academy of sciences, Fujian institute of material structure of state key laboratory of structural chemistry and key laboratory of optoelectronic materials chemistry and physics of Chinese academy researcher Luo Junhua led inorganic photoelectric functional crystal materials research team, and they puts forward the strategies of solid phase transformation induced polarization effect in the symmetry breakdown and constructed a series of novel polarity photoelectric functional crystalline materials under the support of the Outstanding Young Investigator Award、the research institute researcher Sun Zhihua presided over the "hundred team" "Chunmiao special talent" and the Fujian Province outstanding youth fund project supported.
Recently, the team was based on the design strategy of the induced polarization effect of solid phase transition symmetry and obtained a case of ferroelectric crystal with a type of perovskite structure.The cationic ions are aligned along the polar axis in the phase transition process and it has a strong polarization effect with metal skeleton.It was found that in the light condition, the crystal showed the photoelectric characteristics of the isotropic semiconductor.The crystals generate a significant temperature dependent PV voltage and PV current along the 2-d direction of the metal skeleton layer, and it shows obvious photoconductivity characteristics on the vertical direction.Further structural analysis reveals that the ferroelectric polarization effect of this material plays a decisive role in its photoelectric performance and the results were published in the journal of applied chemistry in Germany.The successful preparation of ferroelectric semiconductor photoelectric crystal materials will effectively expand the potential applications of inorganic/organic mineralized titanium materials in photovoltaic solar energy and photoelectric detection.
Earlier, in the early stage of the exploration process, based on the crystal structure transition mechanism, the scientists used a solid phase transition of symmetry breaking induced by the characteristic of the polarization effect and develop a new method for constructing solid frequency crystal switch.Scientists have pioneered this strategy to the plastic phase change material system, and obtained the ultra-high switching ratio double frequency switch crystal material.At the same time, they also obtained ferroelectric materials with spontaneous polarization, and successfully applied ferroelectric materials to pyroelectric detection with high sensitivity.
In addition, the team also used bo3 and po4 functional primitive chemical synthesis of central symmetry structure compounds,and obtained a series of UV and deep UV nonlinear optical crystal materials, including the development of the series without layered habits of beryllium borate deep UV nonlinear optical crystal materials and the expansion of the phosphate deep UV nonlinear optical crystal materials.