The figure of merit ZT is the direct embodiment of thermoelectric performance for a given material.However,as an indicator of performance improvement,the only ZT value is not good enough to identify its outstanding in...The figure of merit ZT is the direct embodiment of thermoelectric performance for a given material.However,as an indicator of performance improvement,the only ZT value is not good enough to identify its outstanding inherent properties,which are highly sought in thermoelectric community.Here,we utilize one powerful parameter to reveal the outstanding properties of a given material.The weighted mobility is used to estimate the carrier transports of p-type SnS crystals,including the differences in doping level,carrier scattering and electronic band structure.We analyze the difference in carrier scattering mechanism for different crystal forms with the same doping level,then evaluate and confirm the temperature-dependent evolution of electronic band structures in SnS.Finally,we calculate the quality factor B based on the weighted mobility,and establish the relationship between ZT and B to further predict the potential performance in p-type SnS crystals with low cost and earth abundance,which can be realized through taking advantage of the inherent material property,thus improving B factor to achieve optimal thermoelectric level.展开更多
Thermoelectric materials enable the direct conversion between heat and electricity,providing potential in power generation and cooling applications[1].The energy conversion efficiency is determined by the dimensionles...Thermoelectric materials enable the direct conversion between heat and electricity,providing potential in power generation and cooling applications[1].The energy conversion efficiency is determined by the dimensionless figure of merit ZT=S^(2)σT/κ_(tot),where S is the Seebeck coefficient;σis the electrical conductivity;T is the temperature in Kelvin;κ_(tot)is the total thermal conductivity.展开更多
基金Supported by the National Key Research and Development Program of China(Grant Nos.2018YFA0702100 and 2018YFB0703600)the National Natural Science Foundation of China(Grant Nos.51632005 and 51772012)+3 种基金the Beijing Natural Science Foundation(Grant No.JQ18004)the Shenzhen Peacock Plan Team(Grant No.KQTD2016022619565991)111 Project(Grant No.B17002)the National Science Fund for Distinguished Young Scholars(Grant No.51925101).
文摘The figure of merit ZT is the direct embodiment of thermoelectric performance for a given material.However,as an indicator of performance improvement,the only ZT value is not good enough to identify its outstanding inherent properties,which are highly sought in thermoelectric community.Here,we utilize one powerful parameter to reveal the outstanding properties of a given material.The weighted mobility is used to estimate the carrier transports of p-type SnS crystals,including the differences in doping level,carrier scattering and electronic band structure.We analyze the difference in carrier scattering mechanism for different crystal forms with the same doping level,then evaluate and confirm the temperature-dependent evolution of electronic band structures in SnS.Finally,we calculate the quality factor B based on the weighted mobility,and establish the relationship between ZT and B to further predict the potential performance in p-type SnS crystals with low cost and earth abundance,which can be realized through taking advantage of the inherent material property,thus improving B factor to achieve optimal thermoelectric level.
基金supported by the National Science Fund for Distinguished Young Scholars(51925101)National Key Research and Development Program of China(2018YFA0702100)+1 种基金111 Project(B17002)Lise Meitner Project(M2889-N)。
文摘Thermoelectric materials enable the direct conversion between heat and electricity,providing potential in power generation and cooling applications[1].The energy conversion efficiency is determined by the dimensionless figure of merit ZT=S^(2)σT/κ_(tot),where S is the Seebeck coefficient;σis the electrical conductivity;T is the temperature in Kelvin;κ_(tot)is the total thermal conductivity.
