声表面波器件(SAWD)现电荷耦合器件(CCD)是目前实现模拟信号处理的成功器件。本文介绍一种兼有SAWD和CCD两者优点,且不难把频率扩展到微波频段的新型高速信号处理器件——声电输运器件(Acoustic Charge Transport Dviece ACTD)。在简要...声表面波器件(SAWD)现电荷耦合器件(CCD)是目前实现模拟信号处理的成功器件。本文介绍一种兼有SAWD和CCD两者优点,且不难把频率扩展到微波频段的新型高速信号处理器件——声电输运器件(Acoustic Charge Transport Dviece ACTD)。在简要介绍了ACTD的基本结构、工作原理和特点后,给出了基于ACT原理的几种典型信号处理器件。ACTD是一种具有很大应用潜力的新型器件。展开更多
Synergistically regulating carrier and phonon transport on the nanoscale is extremely difficult for all thermoelectric(TE)materials without cage structures.Herein BaFe_(12)O_(19)/Bi_(2)Te_(2.5)Se_(0.5)thermoelectromag...Synergistically regulating carrier and phonon transport on the nanoscale is extremely difficult for all thermoelectric(TE)materials without cage structures.Herein BaFe_(12)O_(19)/Bi_(2)Te_(2.5)Se_(0.5)thermoelectromagnetic nanocomposites are designed and synthesized as a benchmarking example to simultaneously tailor the transport properties on the nanoscale.A magneto-trapped carrier effect induced by BaFe_(12)O_(19)hard-magnetic nanoparticles(NPs)is discovered,which can lower the carrier concentration of n-type Bi_(2)Te_(2.5)Se_(0.5)matrix by 16%,and increase the Seebeck coefficient by 16%.Meanwhile,BaFe_(12)O_(19)NPs provide phonon scattering centers and reduce the thermal conductivity by 12%.As a result,the ZT value of the nanocomposites is enhanced by more than 25%in the range of 300-450 K,and the cooling temperature difference increases by 65%near room temperature.This work greatly broadens the commercial application potential of ntype Bi_(2)Te_(2.5)Se_(0.5),and demonstrates magneto-trapped carrier effect as a universal strategy to enhance the electro-thermal conversion performance of TE materials with high carrier concentration.展开更多
文摘声表面波器件(SAWD)现电荷耦合器件(CCD)是目前实现模拟信号处理的成功器件。本文介绍一种兼有SAWD和CCD两者优点,且不难把频率扩展到微波频段的新型高速信号处理器件——声电输运器件(Acoustic Charge Transport Dviece ACTD)。在简要介绍了ACTD的基本结构、工作原理和特点后,给出了基于ACT原理的几种典型信号处理器件。ACTD是一种具有很大应用潜力的新型器件。
基金the National Natural Science Foundation of China(11834012,51620105014,91963207,91963122 and 51902237)the National Key Research and Development Program of China(2018YFB0703603,2019YFA0704900 and SQ2018YFE010905)Foshan Xianhu Laboratory of Advanced Energy Science and Technology Guangdong Laboratory(XHT2020-004)。
文摘Synergistically regulating carrier and phonon transport on the nanoscale is extremely difficult for all thermoelectric(TE)materials without cage structures.Herein BaFe_(12)O_(19)/Bi_(2)Te_(2.5)Se_(0.5)thermoelectromagnetic nanocomposites are designed and synthesized as a benchmarking example to simultaneously tailor the transport properties on the nanoscale.A magneto-trapped carrier effect induced by BaFe_(12)O_(19)hard-magnetic nanoparticles(NPs)is discovered,which can lower the carrier concentration of n-type Bi_(2)Te_(2.5)Se_(0.5)matrix by 16%,and increase the Seebeck coefficient by 16%.Meanwhile,BaFe_(12)O_(19)NPs provide phonon scattering centers and reduce the thermal conductivity by 12%.As a result,the ZT value of the nanocomposites is enhanced by more than 25%in the range of 300-450 K,and the cooling temperature difference increases by 65%near room temperature.This work greatly broadens the commercial application potential of ntype Bi_(2)Te_(2.5)Se_(0.5),and demonstrates magneto-trapped carrier effect as a universal strategy to enhance the electro-thermal conversion performance of TE materials with high carrier concentration.
