High pressure as an effective strategy was employed to synthesize and modulate the electrical transport properties of(Bi,Sb)_(2)Te_(3) alloys.Intrinsic point defects could be significantly regulated via high pressure,...High pressure as an effective strategy was employed to synthesize and modulate the electrical transport properties of(Bi,Sb)_(2)Te_(3) alloys.Intrinsic point defects could be significantly regulated via high pressure,inducing a suitable donor-like effect to optimize the carrier concentration.The texture and microstructure were improved with high pressure,and a nanograin with(00l)orientation was observed in the(Bi,Sb)_(2)Te_(3) matrix,suggesting that high pressure could facilitate the recrystallization of lattice defects along the(00l)orientation.Based on the synergistic effect of high pressure on intrinsic point defects,texture,and microstructure,the carrier concentration and mobility are regularly modulated,resulting in the room-temperature power factor of the(Bi,Sb)_(2)Te_(3) alloys exhibiting a strong correlation with pressure.Hence,these important results here provide a prospective strategy in the improvement in the electrical transport properties of the Bi_(2)Te_(3)-based alloys according to the rational design of intrinsic point defects,texture,and microstructure with high pressure.展开更多
基金supported by the National Science Foundation of China(11464035)theChina Postdoctoral Science Foundation(2016M601397)+2 种基金the Jilin Science and Technology Development Plan(20180520012JH)the“13th Five-Year Plan”Science and Technology Research of Jilin Provincial Department of Education(JJKH20181120KJ)the Changchun University of Science and Technology(XQNJJ-2016-06).
文摘High pressure as an effective strategy was employed to synthesize and modulate the electrical transport properties of(Bi,Sb)_(2)Te_(3) alloys.Intrinsic point defects could be significantly regulated via high pressure,inducing a suitable donor-like effect to optimize the carrier concentration.The texture and microstructure were improved with high pressure,and a nanograin with(00l)orientation was observed in the(Bi,Sb)_(2)Te_(3) matrix,suggesting that high pressure could facilitate the recrystallization of lattice defects along the(00l)orientation.Based on the synergistic effect of high pressure on intrinsic point defects,texture,and microstructure,the carrier concentration and mobility are regularly modulated,resulting in the room-temperature power factor of the(Bi,Sb)_(2)Te_(3) alloys exhibiting a strong correlation with pressure.Hence,these important results here provide a prospective strategy in the improvement in the electrical transport properties of the Bi_(2)Te_(3)-based alloys according to the rational design of intrinsic point defects,texture,and microstructure with high pressure.
