For enhancement-mode InGaP/A1GaAs/InGaAs PHEMTs,gate annealing is conducted between gate structures of Ti/Pt/Au and Pt/Ti/Pt/Au. Comparison is made after thermal annealing and an optimum annealing process is ob- taine...For enhancement-mode InGaP/A1GaAs/InGaAs PHEMTs,gate annealing is conducted between gate structures of Ti/Pt/Au and Pt/Ti/Pt/Au. Comparison is made after thermal annealing and an optimum annealing process is ob- tained. Using the structure of Ti/Pt/Au, about a 200mV positive shift of threshold voltage is achieved by thermal annea- ling at 320℃ for 40min in N2 ambient. Finally, a stable and consistent enhancement-mode PHEMT is produced successfully with higher threshold voltage.展开更多
An extraction method of the component parameter values of an enhancement-mode InGaP/AIGaAs/In-GaAs PHEMT small signal equivalent circuit is presented,and these component parameter values are extracted by using the EEH...An extraction method of the component parameter values of an enhancement-mode InGaP/AIGaAs/In-GaAs PHEMT small signal equivalent circuit is presented,and these component parameter values are extracted by using the EEHEMT1 model of IC-CAP software. The extraction results are verified by ADS software,and the DC I-V curves and S parameters simulated by ADS are basically accordant with those of the test results. These results indicate that the EEHEMT1 model can be used for extracting the component parameters of an enhancement-mode PHEMT.展开更多
Heterojunction bipolar transistor (HBT) is of great interest for the application to microwave power and analog circuits. As known, decreasing bandgap energy of the base layer in HBT can result in a smaller turn-on vol...Heterojunction bipolar transistor (HBT) is of great interest for the application to microwave power and analog circuits. As known, decreasing bandgap energy of the base layer in HBT can result in a smaller turn-on voltage. Using InGaAs as a base material in GaAs HBT is a possible approach to achieve the aim. In this work, a novel InGaP/InGaAs/GaAs double heterojunction bipolar transistor (DHBT) structure with an InGaAs base was designed and grown by gas source molecular beam epitaxy (GSMBE). High-quality InGaAs/GaAs hetero epi-layers and a good doping figure were obtained through optimizing the layer structure and the growth condition. The DHBT devices of a 120 μm×120 μm emitter area were fabricated by normal process and the good DC performance was obtained. A breakdown voltage of 10 V and an offset voltage of just 0.4 V were achieved. These results indicate that the InGaP/InGaAs/GaAs DHBT is suitable for low power-dissipation and high power applications.展开更多
Positive bias temperature instability stress induced interface trap density in a buried InGaAs channel metaloxide-semiconductor field-effect transistor with a InCaP barrier layer and Al2O3 dielectric is investigated. ...Positive bias temperature instability stress induced interface trap density in a buried InGaAs channel metaloxide-semiconductor field-effect transistor with a InCaP barrier layer and Al2O3 dielectric is investigated. Well behaved split C-V characteristics with small capacitance frequency dispersion are confirmed after the insertion of the InCaP barrier layer. The direct-current Id-Vg measurements show both degradations of positive gate voltage shift and sub-threshold swing in the sub-threshold region, and degradation of positive △Vg in the oncurrent region. The Id-Vg degradation during the positive bias temperature instability tests is mainly contributed by the generation of near interface acceptor traps under stress. Specifically, the stress induced aeceptor traps contain both permanent and recoverable traps. Compared with surface channel InCaAs devices, stress induced recoverable donor traps are negligible in the buried channel ones.展开更多
报道了用 MBE技术生长的 Ga As基 In Al As/In Ga As改变结构高电子迁移率晶体管 (MHEMT)的制作过程和器件的直流性能。对于栅长为 0 .8μm的器件 ,最大非本征跨导和饱和电流密度分别为 3 5 0 m S/mm和1 90 m A/mm。源漏击穿电压和栅反...报道了用 MBE技术生长的 Ga As基 In Al As/In Ga As改变结构高电子迁移率晶体管 (MHEMT)的制作过程和器件的直流性能。对于栅长为 0 .8μm的器件 ,最大非本征跨导和饱和电流密度分别为 3 5 0 m S/mm和1 90 m A/mm。源漏击穿电压和栅反向击穿电压分别为 4V和 7.5 V。这些直流特性超过了相同的材料和工艺条件下 Ga As基 PHEMT的水平 ,与 In P基 In Al As/In Ga As展开更多
用 PL谱测试研究了 Ga As和不同 In组份 Inx Ga1 - x As(x=0 .1,0 .2 ,0 .3)覆盖层对分子束外延生长的 In As/Ga As自组织量子点发光特性的影响 .用 Inx Ga1 - x As外延层覆盖 In As/ Ga As量子点 ,比用 Ga As做覆盖层其发光峰能量向低...用 PL谱测试研究了 Ga As和不同 In组份 Inx Ga1 - x As(x=0 .1,0 .2 ,0 .3)覆盖层对分子束外延生长的 In As/Ga As自组织量子点发光特性的影响 .用 Inx Ga1 - x As外延层覆盖 In As/ Ga As量子点 ,比用 Ga As做覆盖层其发光峰能量向低能端移动 ,发光峰半高宽变窄 ,量子点发光峰能量随温度的红移幅度变小 .理论计算证实这是由于覆盖层 Inx Ga1 - x As减小了 In As表面应力导致发光峰红移 ,而 In元素有效抑制了 In As/ Ga As界面组份的混杂 ,量子点的均匀性得到改善 ,PL 谱半高宽变窄 .用 In Ga As覆盖的 In0 .5 Ga0 .5 As/ Ga As自组织量子点实现了 1.3μm发光 ,室温下 PL谱半高宽为 19.2 me V。展开更多
Self-assembled In 0.35Ga 0.65As/GaAs quantum dots with low indium content are grown under different growth temperature and investigated using contact atomic force microscopy(AFM).In order to obtain high density ...Self-assembled In 0.35Ga 0.65As/GaAs quantum dots with low indium content are grown under different growth temperature and investigated using contact atomic force microscopy(AFM).In order to obtain high density and high uniformity of quantum dots,optimized conditions are concluded for MBE growth.Optimized growth conditions also compared with these of InAs/GaAs quantum dots.This will be very useful for InGaAs/GaAs QDs optoelectronic applications,such as quantum dots lasers and quantum dots infrared photodetectors.展开更多
用分子束外延技术生长了 In Ga As/Ga As异质结材料 ,并用 HALL效应法和电化学 C- V分布研究其特性。讨论了 In Ga As/Ga As宜质结杨效应晶体管 ( HFET)的优越性。和 Ga As MESFETS或 HEMT相比 ,由于 HFET没有 Al组份 ,具有低温特性好 ...用分子束外延技术生长了 In Ga As/Ga As异质结材料 ,并用 HALL效应法和电化学 C- V分布研究其特性。讨论了 In Ga As/Ga As宜质结杨效应晶体管 ( HFET)的优越性。和 Ga As MESFETS或 HEMT相比 ,由于 HFET没有 Al组份 ,具有低温特性好 ,低噪声和高增益等特点。本文研究了具有 In Ga As/Ga As双沟道和独特掺杂分布的低噪声高增益 HFET。展开更多
文摘For enhancement-mode InGaP/A1GaAs/InGaAs PHEMTs,gate annealing is conducted between gate structures of Ti/Pt/Au and Pt/Ti/Pt/Au. Comparison is made after thermal annealing and an optimum annealing process is ob- tained. Using the structure of Ti/Pt/Au, about a 200mV positive shift of threshold voltage is achieved by thermal annea- ling at 320℃ for 40min in N2 ambient. Finally, a stable and consistent enhancement-mode PHEMT is produced successfully with higher threshold voltage.
文摘An extraction method of the component parameter values of an enhancement-mode InGaP/AIGaAs/In-GaAs PHEMT small signal equivalent circuit is presented,and these component parameter values are extracted by using the EEHEMT1 model of IC-CAP software. The extraction results are verified by ADS software,and the DC I-V curves and S parameters simulated by ADS are basically accordant with those of the test results. These results indicate that the EEHEMT1 model can be used for extracting the component parameters of an enhancement-mode PHEMT.
文摘Heterojunction bipolar transistor (HBT) is of great interest for the application to microwave power and analog circuits. As known, decreasing bandgap energy of the base layer in HBT can result in a smaller turn-on voltage. Using InGaAs as a base material in GaAs HBT is a possible approach to achieve the aim. In this work, a novel InGaP/InGaAs/GaAs double heterojunction bipolar transistor (DHBT) structure with an InGaAs base was designed and grown by gas source molecular beam epitaxy (GSMBE). High-quality InGaAs/GaAs hetero epi-layers and a good doping figure were obtained through optimizing the layer structure and the growth condition. The DHBT devices of a 120 μm×120 μm emitter area were fabricated by normal process and the good DC performance was obtained. A breakdown voltage of 10 V and an offset voltage of just 0.4 V were achieved. These results indicate that the InGaP/InGaAs/GaAs DHBT is suitable for low power-dissipation and high power applications.
基金Supported by the National Science and Technology Major Project of China under Grant No 2011ZX02708-003the National Natural Science Foundation of China under Grant No 61504165the Opening Project of Key Laboratory of Microelectronics Devices and Integrated Technology of Institute of Microelectronics of Chinese Academy of Sciences
文摘Positive bias temperature instability stress induced interface trap density in a buried InGaAs channel metaloxide-semiconductor field-effect transistor with a InCaP barrier layer and Al2O3 dielectric is investigated. Well behaved split C-V characteristics with small capacitance frequency dispersion are confirmed after the insertion of the InCaP barrier layer. The direct-current Id-Vg measurements show both degradations of positive gate voltage shift and sub-threshold swing in the sub-threshold region, and degradation of positive △Vg in the oncurrent region. The Id-Vg degradation during the positive bias temperature instability tests is mainly contributed by the generation of near interface acceptor traps under stress. Specifically, the stress induced aeceptor traps contain both permanent and recoverable traps. Compared with surface channel InCaAs devices, stress induced recoverable donor traps are negligible in the buried channel ones.
文摘报道了用 MBE技术生长的 Ga As基 In Al As/In Ga As改变结构高电子迁移率晶体管 (MHEMT)的制作过程和器件的直流性能。对于栅长为 0 .8μm的器件 ,最大非本征跨导和饱和电流密度分别为 3 5 0 m S/mm和1 90 m A/mm。源漏击穿电压和栅反向击穿电压分别为 4V和 7.5 V。这些直流特性超过了相同的材料和工艺条件下 Ga As基 PHEMT的水平 ,与 In P基 In Al As/In Ga As
文摘用 PL谱测试研究了 Ga As和不同 In组份 Inx Ga1 - x As(x=0 .1,0 .2 ,0 .3)覆盖层对分子束外延生长的 In As/Ga As自组织量子点发光特性的影响 .用 Inx Ga1 - x As外延层覆盖 In As/ Ga As量子点 ,比用 Ga As做覆盖层其发光峰能量向低能端移动 ,发光峰半高宽变窄 ,量子点发光峰能量随温度的红移幅度变小 .理论计算证实这是由于覆盖层 Inx Ga1 - x As减小了 In As表面应力导致发光峰红移 ,而 In元素有效抑制了 In As/ Ga As界面组份的混杂 ,量子点的均匀性得到改善 ,PL 谱半高宽变窄 .用 In Ga As覆盖的 In0 .5 Ga0 .5 As/ Ga As自组织量子点实现了 1.3μm发光 ,室温下 PL谱半高宽为 19.2 me V。
文摘Self-assembled In 0.35Ga 0.65As/GaAs quantum dots with low indium content are grown under different growth temperature and investigated using contact atomic force microscopy(AFM).In order to obtain high density and high uniformity of quantum dots,optimized conditions are concluded for MBE growth.Optimized growth conditions also compared with these of InAs/GaAs quantum dots.This will be very useful for InGaAs/GaAs QDs optoelectronic applications,such as quantum dots lasers and quantum dots infrared photodetectors.
文摘用分子束外延技术生长了 In Ga As/Ga As异质结材料 ,并用 HALL效应法和电化学 C- V分布研究其特性。讨论了 In Ga As/Ga As宜质结杨效应晶体管 ( HFET)的优越性。和 Ga As MESFETS或 HEMT相比 ,由于 HFET没有 Al组份 ,具有低温特性好 ,低噪声和高增益等特点。本文研究了具有 In Ga As/Ga As双沟道和独特掺杂分布的低噪声高增益 HFET。
