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Study on the fabrication and the characterization of 100 nm T-gate InGaAs/InAlAs/GaAs Metamorphic HEMTs  

Kim, H.S. (Department of Physics, Dongguk University)
Shin, D.H. (MINT Dongguk University)
Kim, S.K. (MINT Dongguk University)
Kim, H.B. (Department of Physics, Dongguk University)
Im, Hyun-Sik (Department of semiconductor Science)
Kim, H.J. (Department of semiconductor Science)
Publication Information
Journal of the Korean Vacuum Society / v.15, no.6, 2006 , pp. 637-641 More about this Journal
Abstract
We present the DC and RF characteristics of 100 nm gate length InGaAs/InAlAs/GaAs metamorphic high electron mobility transistors (MHEMTs). We fabricated the T-gate with 100 nm foot print by using a positive resist ZEP520/P (MMA-MAA)/PMMA trilayer by double exposure method. The fabricated 100 nm MHEMT with a $70\;{\mu}m$ unit gate width and two fingers were characterized through do and rf measurements. The maximum drain current density of 465 mA/mm and extrinsic transconductance $(g_m)$ of 844 mS/mm were obtained with our devices. From rf measurements, we obtained the current gain cut-off frequency $(f_T)$ of 192 GHz, and maximum oscillation frequency $(f_{max})$ 310 GHz.
Keywords
MHEMT; T-gate; e-beam lithography; ZEP520; Cut-off frequency;
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