We report the transport properties of a topological insulator candidate,LiMgBi.The electric resistivity of the title compound exhibits a metal-to-semiconductor-like transition at around 160 K and tends to saturation b...We report the transport properties of a topological insulator candidate,LiMgBi.The electric resistivity of the title compound exhibits a metal-to-semiconductor-like transition at around 160 K and tends to saturation below 50 K.At low temperatures,the magnetoresistance is up to~260%at 9 T and a clear weak antilocalization effect is observed in the low magnetic-field region.The Hall measurement reveals that LiMgBi is a multiband system,where hole-type carriers(nh~1018 cm^(-3))play a major role in the transport process.Remarkably,LiMgBi possess a large Seebeck coefficient(~440μV/K)and a moderate thermal conductivity at room temperature,which indicate that LiMgBi is a promising candidate in thermoelectric applications.展开更多
In the progress of realizing the commercialization of organic optoelectronic materials,the four basic coherent factors are stability,cost,performance,and processability,all which determine the results of device applic...In the progress of realizing the commercialization of organic optoelectronic materials,the four basic coherent factors are stability,cost,performance,and processability,all which determine the results of device applications.Spiro[fluorene-9,9′-xanthene](SFX)has been becoming the robust building-block that fulfilling the practical requirements due to its key features of non-planarity,one-pot facile availability,well-defined quality assurance as well as performance behaviors.In this review,we introduce the SFX and its analogues,including synthesis,molecular design,device performance,and structure-property relationship,in the applications of organic light-emitting diodes(OLEDs),organic photovoltaics,perovskite solar cells(PSCs)and others.Furthermore,emitters or hosts for OLED and hole transport materials for PSCs are highlighted at the level of molecular configuration and film morphology.Tracing the thread from intrinsic photoelectric properties,molecular packing to optoelectronic application,the advantage of stability and low-cost of SFX-based materials are illuminated,and an outlook is given providing orientation for bring SFX into the fields of catalysis and energy chemistry in view of its binary conjugation and three-dimensional configuration.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0300604)the National Natural Science Foundation of China(Grant No.11874417)the Strategic Priority Research Program(B)of Chinese Academy of Sciences(Grant No.XDB33010100)。
文摘We report the transport properties of a topological insulator candidate,LiMgBi.The electric resistivity of the title compound exhibits a metal-to-semiconductor-like transition at around 160 K and tends to saturation below 50 K.At low temperatures,the magnetoresistance is up to~260%at 9 T and a clear weak antilocalization effect is observed in the low magnetic-field region.The Hall measurement reveals that LiMgBi is a multiband system,where hole-type carriers(nh~1018 cm^(-3))play a major role in the transport process.Remarkably,LiMgBi possess a large Seebeck coefficient(~440μV/K)and a moderate thermal conductivity at room temperature,which indicate that LiMgBi is a promising candidate in thermoelectric applications.
基金support by the the Sci-ence Research Plan of Shenyang University of Chemical Technol-ogy(XXLJ2019006)the Natural Science Foundation of Liaoning Province(2021-MS-254).
文摘In the progress of realizing the commercialization of organic optoelectronic materials,the four basic coherent factors are stability,cost,performance,and processability,all which determine the results of device applications.Spiro[fluorene-9,9′-xanthene](SFX)has been becoming the robust building-block that fulfilling the practical requirements due to its key features of non-planarity,one-pot facile availability,well-defined quality assurance as well as performance behaviors.In this review,we introduce the SFX and its analogues,including synthesis,molecular design,device performance,and structure-property relationship,in the applications of organic light-emitting diodes(OLEDs),organic photovoltaics,perovskite solar cells(PSCs)and others.Furthermore,emitters or hosts for OLED and hole transport materials for PSCs are highlighted at the level of molecular configuration and film morphology.Tracing the thread from intrinsic photoelectric properties,molecular packing to optoelectronic application,the advantage of stability and low-cost of SFX-based materials are illuminated,and an outlook is given providing orientation for bring SFX into the fields of catalysis and energy chemistry in view of its binary conjugation and three-dimensional configuration.
