Physical modeling of direct current and radio frequency characteristics for In P-based InAlAs/InGaAs HEMTs |
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| Affiliation: | 1.School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China;2.Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Direct current (DC) and radio frequency (RF) performances of InP-based high electron mobility transistors (HEMTs) are investigated by Sentaurus TCAD. The physical models including hydrodynamic transport model, Shockley-Read-Hall recombination, Auger recombination, radiative recombination, density gradient model and high field-dependent mobility are used to characterize the devices. The simulated results and measured results about DC and RF performances are compared, showing that they are well matched. However, the slight differences in channel current and pinch-off voltage may be accounted for by the surface defects resulting from oxidized InAlAs material in the gate-recess region. Moreover, the simulated frequency characteristics can be extrapolated beyond the test equipment limitation of 40 GHz, which gives a more accurate maximum oscillation frequency (fmax) of 385 GHz. |
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| Keywords: | InP-based HEMT hydrodynamic model the current gain cutoff frequency (fT) the maximum oscillation frequency (fmax) |
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