This article reports the results of our investigations on electronic and transport properties of zinc blende gallium antimonide (zb-GaSb). Our ab-initio, self-consistent and non-relativistic calculations used a local ...This article reports the results of our investigations on electronic and transport properties of zinc blende gallium antimonide (zb-GaSb). Our ab-initio, self-consistent and non-relativistic calculations used a local density approximation potential (LDA) and the linear combination of atomic orbital formalism (LCAO). We have succeeded in performing a generalized minimization of the energy, using the Bagayoko, Zhao and Williams (BZW) method, to reach the ground state of the material while avoiding over-complete basis sets. Consequently, our results have the full physical content of density functional theory (DFT) and agree with available, corresponding experimental data. Using an experimental room temperature lattice constant of 6.09593?, we obtained a direct band gap of 0.751 eV, in good agreement with room temperature measurements. Our results reproduced the experimental locations of the peaks in the total density of valence states as well as the measured electron and hole effective masses. Hence, this work points to the capability of ab-initio DFT calculations to inform and to guide the design and the fabrication of semiconductor based devices—provided a generalized minimization of the energy is performed.展开更多
Resistivity, magnetoresistivity and Hall effect measurements in n-type Te-doped GaSb grown by the liquid encapsuled Czochralski technique are carried out as functions of temperature （35-350 K） and magnetic field （0...Resistivity, magnetoresistivity and Hall effect measurements in n-type Te-doped GaSb grown by the liquid encapsuled Czochralski technique are carried out as functions of temperature （35-350 K） and magnetic field （0-1.35 T）. The power law model is used to explain the temperature-dependent resistivity. The magnetic-field-dependent data are analysed using the quantitative mobility spectrum analysis technique. The effect of individual band parameters （nL, nr, μL, μr, p and μp） on both the electron and magneto transports have been discussed. The EL - Er energy separation between the L and conduction band edges is also derived.展开更多
2μm^5μm波段GaSb基VCSEL对大气检测技术有着重要的应用,但制备技术的不成熟严重制约着GaSb基VCSEL的发展。刻蚀工艺中出现的下切效应就是器件制备中存在的突出问题。针对上述问题,选择三种不同成分的磷酸系刻蚀液进行了对比性刻蚀实验...2μm^5μm波段GaSb基VCSEL对大气检测技术有着重要的应用,但制备技术的不成熟严重制约着GaSb基VCSEL的发展。刻蚀工艺中出现的下切效应就是器件制备中存在的突出问题。针对上述问题,选择三种不同成分的磷酸系刻蚀液进行了对比性刻蚀实验,并通过台阶仪、扫描电子显微镜(SEM)测试观察了刻蚀速率和表面形貌。实验分析表明,浓度配比为1 m L:1 m L:0.6 g:10 m L的H_3PO_4:H_2O_2:C_4H_6O_6:H_2O刻蚀液具有良好的腐蚀效果,消除了以往腐蚀过程中出现的下切效应,且垂直形貌好,未出现钻蚀现象,晶片表面平整且光滑,且保持稳定的刻蚀速率0.62μm/min,为激光器制备提供了良好的前期实验基础。展开更多
The properties of GaSb substrates commonly used for the preparation of Ⅲ Ⅴ antimonide epilayers were studied before and after growing GaInAsSb multi layers by MOCVD using PL, FTIR and DCXD together with the electr...The properties of GaSb substrates commonly used for the preparation of Ⅲ Ⅴ antimonide epilayers were studied before and after growing GaInAsSb multi layers by MOCVD using PL, FTIR and DCXD together with the electrical properties and EPD values. The correlation between the substrate qualities and epilayer properties was briefly discussed. The good property epilayers of GaInAsSb and, then, the high performance of 2.3 μm photodetectors were achieved only when the good quality GaSb wafers was used as the substrates.展开更多
A single gate Ⅲ-Ⅴ junctionless tunnel field effect transistor（SG-JLTFET） has been reported which shows excellent dc characteristics at low power supply operation.This device has a thin uniformly n-type doped chann...A single gate Ⅲ-Ⅴ junctionless tunnel field effect transistor（SG-JLTFET） has been reported which shows excellent dc characteristics at low power supply operation.This device has a thin uniformly n-type doped channel of GaSb i.e.gallium antimonide which is grown epitaxially over silicon substrate.The DC performance parameters such as I（on）,I（on）/I（off）,average and point subthreshold slope as well as device parameters for analog applications viz.transconductance gm,transconductance generation efficiency gm/ID,various capacitances and the unity gain frequency fT are studied using a device simulator.Along with examining its endurance to short channel effects,the performances are also compared with a Silicon Dual Gate Junctionless Tunnel FET（DG-JLTFET）.The DC and small signal analog performance reflects that GaSb SG-JLTFET has immense purview for extreme high-frequency and low-power applications.展开更多
文摘This article reports the results of our investigations on electronic and transport properties of zinc blende gallium antimonide (zb-GaSb). Our ab-initio, self-consistent and non-relativistic calculations used a local density approximation potential (LDA) and the linear combination of atomic orbital formalism (LCAO). We have succeeded in performing a generalized minimization of the energy, using the Bagayoko, Zhao and Williams (BZW) method, to reach the ground state of the material while avoiding over-complete basis sets. Consequently, our results have the full physical content of density functional theory (DFT) and agree with available, corresponding experimental data. Using an experimental room temperature lattice constant of 6.09593?, we obtained a direct band gap of 0.751 eV, in good agreement with room temperature measurements. Our results reproduced the experimental locations of the peaks in the total density of valence states as well as the measured electron and hole effective masses. Hence, this work points to the capability of ab-initio DFT calculations to inform and to guide the design and the fabrication of semiconductor based devices—provided a generalized minimization of the energy is performed.
文摘Resistivity, magnetoresistivity and Hall effect measurements in n-type Te-doped GaSb grown by the liquid encapsuled Czochralski technique are carried out as functions of temperature （35-350 K） and magnetic field （0-1.35 T）. The power law model is used to explain the temperature-dependent resistivity. The magnetic-field-dependent data are analysed using the quantitative mobility spectrum analysis technique. The effect of individual band parameters （nL, nr, μL, μr, p and μp） on both the electron and magneto transports have been discussed. The EL - Er energy separation between the L and conduction band edges is also derived.
文摘2μm^5μm波段GaSb基VCSEL对大气检测技术有着重要的应用,但制备技术的不成熟严重制约着GaSb基VCSEL的发展。刻蚀工艺中出现的下切效应就是器件制备中存在的突出问题。针对上述问题,选择三种不同成分的磷酸系刻蚀液进行了对比性刻蚀实验,并通过台阶仪、扫描电子显微镜(SEM)测试观察了刻蚀速率和表面形貌。实验分析表明,浓度配比为1 m L:1 m L:0.6 g:10 m L的H_3PO_4:H_2O_2:C_4H_6O_6:H_2O刻蚀液具有良好的腐蚀效果,消除了以往腐蚀过程中出现的下切效应,且垂直形貌好,未出现钻蚀现象,晶片表面平整且光滑,且保持稳定的刻蚀速率0.62μm/min,为激光器制备提供了良好的前期实验基础。
文摘The properties of GaSb substrates commonly used for the preparation of Ⅲ Ⅴ antimonide epilayers were studied before and after growing GaInAsSb multi layers by MOCVD using PL, FTIR and DCXD together with the electrical properties and EPD values. The correlation between the substrate qualities and epilayer properties was briefly discussed. The good property epilayers of GaInAsSb and, then, the high performance of 2.3 μm photodetectors were achieved only when the good quality GaSb wafers was used as the substrates.
文摘A single gate Ⅲ-Ⅴ junctionless tunnel field effect transistor（SG-JLTFET） has been reported which shows excellent dc characteristics at low power supply operation.This device has a thin uniformly n-type doped channel of GaSb i.e.gallium antimonide which is grown epitaxially over silicon substrate.The DC performance parameters such as I（on）,I（on）/I（off）,average and point subthreshold slope as well as device parameters for analog applications viz.transconductance gm,transconductance generation efficiency gm/ID,various capacitances and the unity gain frequency fT are studied using a device simulator.Along with examining its endurance to short channel effects,the performances are also compared with a Silicon Dual Gate Junctionless Tunnel FET（DG-JLTFET）.The DC and small signal analog performance reflects that GaSb SG-JLTFET has immense purview for extreme high-frequency and low-power applications.
