为了研究4H-SiC金属氧化物半导体场效应晶体管(MOSFET)沟道迁移率和界面态密度的影响因素,通过在N型4H-SiC(0001)外延片上制备不同沟道长度和宽度的横向扩散MOSFET(LDMOSFET),其干氧氧化的栅极氧化层在不同温度和时间的NO和/或N2气氛中...为了研究4H-SiC金属氧化物半导体场效应晶体管(MOSFET)沟道迁移率和界面态密度的影响因素,通过在N型4H-SiC(0001)外延片上制备不同沟道长度和宽度的横向扩散MOSFET(LDMOSFET),其干氧氧化的栅极氧化层在不同温度和时间的NO和/或N2气氛中退火,测试了其输出和转移曲线,提取了有效迁移率和场效应迁移率,利用亚阈值摆幅法提取了界面态密度,并探讨了漏源电压、晶圆位置、温度对迁移率和界面态密度的影响。结果显示,LDMOSFET的沟道尺寸对沟道迁移率和界面态密度有显著的影响,增加NO的退火温度和时间可以提高沟道迁移率,1250℃40 min NO退火和1200℃70 min NO退火的LDMOSFET的常温峰值迁移率均约为45 cm^(2)·V^(-1)·s^(-1),沟道迁移率随测试温度的增加而增加,且高栅压下栅压比测试温度对迁移率的影响更大。展开更多
The effects of several factors on mobility in 4H-SiC buried-channel （BC） MOSFETs are studied,A simple model that gives a quantitative analysis of series resistance effects on the effective mobility and field-effect ...The effects of several factors on mobility in 4H-SiC buried-channel （BC） MOSFETs are studied,A simple model that gives a quantitative analysis of series resistance effects on the effective mobility and field-effect mobility is proposed.A series resistance not only decreases field-effect mobility but also reduces the gate voltage corresponding to the peak field-effect mobility. The dependence of the peak field-effect mobility on series resistance follows a simple quadratic polynomial. The effects of uniform and exponential interface state distributions in the forbidden band on field-effect mobility are analyzed with an analytical model. The effects of non-uniform interface states can be ignored at lower gate voltages but become more obvious as the gate bias increases.展开更多
A new method is used to simulate InGaAs/InP composite channel high electron mobility transistors （HEMTs）. By coupling the hydrodynamic model and the density gradient model, the electron density distribution in the c...A new method is used to simulate InGaAs/InP composite channel high electron mobility transistors （HEMTs）. By coupling the hydrodynamic model and the density gradient model, the electron density distribution in the channel in different electric fields is obtained. This method is faster and more robust than traditional meth- ods and should be applicable to other types of HEMTs simulations. A detailed study of the InGaAs/InP composite channel HEMTs is presented with the help of simulations.展开更多
The process parameters are adjusted and the process procedure is simplified on the basis of precursor's work and the strained Si channel SiGe n MOSFET is fabricated successfully.This n MOSFET takes the strained...The process parameters are adjusted and the process procedure is simplified on the basis of precursor's work and the strained Si channel SiGe n MOSFET is fabricated successfully.This n MOSFET takes the strained Si layer(which is deposited on the relaxed SiGe buffer layer) as current channel and can provide a 48 5% improvement in electron mobility while keeping the gate voltage as 1V.展开更多
Biaxial strain technology is a promising way to improve the mobility of both electrons and holes, while （100） channel direction appears as to be an effective booster of hole mobility in particular. In this work, the...Biaxial strain technology is a promising way to improve the mobility of both electrons and holes, while （100） channel direction appears as to be an effective booster of hole mobility in particular. In this work, the impact of biaxial strain together with （100） channel orientation on hole mobility is explored. The biaxial strain was incorporated by the growth of a relaxed SiGe buffer layer,serving as the template for depositing a Si layer in a state of biaxial tensile strain. The channel orientation was implemented with a 45^o rotated design in the device layout,which changed the channel direction from （110） to （100） on Si （001） surface. The maximum hole mobility is enhanced by 30% due to the change of channel direction from （110） to （100） on the same strained Si （s-Si） p-MOSFETs,in addition to the mobility enhancement of 130% when comparing s-Si pMOS to bulk Si pMOS both along （110） channels. Discussion and analysis are presented about the origin of the mobility enhancement by channel orientation along with biaxial strain in this work.展开更多
文摘为了研究4H-SiC金属氧化物半导体场效应晶体管(MOSFET)沟道迁移率和界面态密度的影响因素,通过在N型4H-SiC(0001)外延片上制备不同沟道长度和宽度的横向扩散MOSFET(LDMOSFET),其干氧氧化的栅极氧化层在不同温度和时间的NO和/或N2气氛中退火,测试了其输出和转移曲线,提取了有效迁移率和场效应迁移率,利用亚阈值摆幅法提取了界面态密度,并探讨了漏源电压、晶圆位置、温度对迁移率和界面态密度的影响。结果显示,LDMOSFET的沟道尺寸对沟道迁移率和界面态密度有显著的影响,增加NO的退火温度和时间可以提高沟道迁移率,1250℃40 min NO退火和1200℃70 min NO退火的LDMOSFET的常温峰值迁移率均约为45 cm^(2)·V^(-1)·s^(-1),沟道迁移率随测试温度的增加而增加,且高栅压下栅压比测试温度对迁移率的影响更大。
文摘The effects of several factors on mobility in 4H-SiC buried-channel （BC） MOSFETs are studied,A simple model that gives a quantitative analysis of series resistance effects on the effective mobility and field-effect mobility is proposed.A series resistance not only decreases field-effect mobility but also reduces the gate voltage corresponding to the peak field-effect mobility. The dependence of the peak field-effect mobility on series resistance follows a simple quadratic polynomial. The effects of uniform and exponential interface state distributions in the forbidden band on field-effect mobility are analyzed with an analytical model. The effects of non-uniform interface states can be ignored at lower gate voltages but become more obvious as the gate bias increases.
文摘A new method is used to simulate InGaAs/InP composite channel high electron mobility transistors （HEMTs）. By coupling the hydrodynamic model and the density gradient model, the electron density distribution in the channel in different electric fields is obtained. This method is faster and more robust than traditional meth- ods and should be applicable to other types of HEMTs simulations. A detailed study of the InGaAs/InP composite channel HEMTs is presented with the help of simulations.
文摘The process parameters are adjusted and the process procedure is simplified on the basis of precursor's work and the strained Si channel SiGe n MOSFET is fabricated successfully.This n MOSFET takes the strained Si layer(which is deposited on the relaxed SiGe buffer layer) as current channel and can provide a 48 5% improvement in electron mobility while keeping the gate voltage as 1V.
文摘Biaxial strain technology is a promising way to improve the mobility of both electrons and holes, while （100） channel direction appears as to be an effective booster of hole mobility in particular. In this work, the impact of biaxial strain together with （100） channel orientation on hole mobility is explored. The biaxial strain was incorporated by the growth of a relaxed SiGe buffer layer,serving as the template for depositing a Si layer in a state of biaxial tensile strain. The channel orientation was implemented with a 45^o rotated design in the device layout,which changed the channel direction from （110） to （100） on Si （001） surface. The maximum hole mobility is enhanced by 30% due to the change of channel direction from （110） to （100） on the same strained Si （s-Si） p-MOSFETs,in addition to the mobility enhancement of 130% when comparing s-Si pMOS to bulk Si pMOS both along （110） channels. Discussion and analysis are presented about the origin of the mobility enhancement by channel orientation along with biaxial strain in this work.
