Abstract
First-layer Si (FL-Si) Si/Ti/Al/Mo/Au contact metallizations are demonstrated to form low resistance and high temperature thermally stable Ohmic contacts on AlGaN/GaN high electron mobility transistor (HEMT) structures. Electrical and surface morphology characterizations have indicated that contact behavior significantly depends on the thickness of FL-Si used, where FL-Si (5 nm) scheme showed the most optimal behavior. The contact resistances of FL-Si schemes are stable for up to 300 h during thermal aging at 500 and 600°C. Aging at 700°C resulted in gradual degradation of contact resistance with values less than 1 Ω mm Ohmic behavior still maintained after 50 h of thermal treatment. No deterioration in the sheet resistance of the heterostructure has been detected upon thermal aging. Atomic force microscopy, Auger electron spectroscopy, and transmission electron microscopy characterizations have been utilized to identify the effect of FL-Si incorporation on the nature of intermetallic and interfacial reactions. Results from this study demonstrate that FL-Si-based metallizations have the potential to meet the critical requirements of low resistance, high temperature thermal stability and smooth surface morphology for the fabrication of AlGaN/GaN HEMTs.
| Original language | English |
|---|---|
| Pages (from-to) | 324-333 |
| Number of pages | 10 |
| Journal | Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures |
| Volume | 25 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2007 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Surfaces and Interfaces
- Physics and Astronomy (miscellaneous)
Cite this
First-layer Si metallizations for thermally stable and smooth Ohmic contacts for AIGaN/GaN high electron mobility transistors. / Mohammed, Fitih M.; Wang, Liang; Adesida, Ilesanmi.
In: Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures, Vol. 25, No. 2, 2007, p. 324-333.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - First-layer Si metallizations for thermally stable and smooth Ohmic contacts for AIGaN/GaN high electron mobility transistors
AU - Mohammed, Fitih M.
AU - Wang, Liang
AU - Adesida, Ilesanmi
PY - 2007
Y1 - 2007
N2 - First-layer Si (FL-Si) Si/Ti/Al/Mo/Au contact metallizations are demonstrated to form low resistance and high temperature thermally stable Ohmic contacts on AlGaN/GaN high electron mobility transistor (HEMT) structures. Electrical and surface morphology characterizations have indicated that contact behavior significantly depends on the thickness of FL-Si used, where FL-Si (5 nm) scheme showed the most optimal behavior. The contact resistances of FL-Si schemes are stable for up to 300 h during thermal aging at 500 and 600°C. Aging at 700°C resulted in gradual degradation of contact resistance with values less than 1 Ω mm Ohmic behavior still maintained after 50 h of thermal treatment. No deterioration in the sheet resistance of the heterostructure has been detected upon thermal aging. Atomic force microscopy, Auger electron spectroscopy, and transmission electron microscopy characterizations have been utilized to identify the effect of FL-Si incorporation on the nature of intermetallic and interfacial reactions. Results from this study demonstrate that FL-Si-based metallizations have the potential to meet the critical requirements of low resistance, high temperature thermal stability and smooth surface morphology for the fabrication of AlGaN/GaN HEMTs.
AB - First-layer Si (FL-Si) Si/Ti/Al/Mo/Au contact metallizations are demonstrated to form low resistance and high temperature thermally stable Ohmic contacts on AlGaN/GaN high electron mobility transistor (HEMT) structures. Electrical and surface morphology characterizations have indicated that contact behavior significantly depends on the thickness of FL-Si used, where FL-Si (5 nm) scheme showed the most optimal behavior. The contact resistances of FL-Si schemes are stable for up to 300 h during thermal aging at 500 and 600°C. Aging at 700°C resulted in gradual degradation of contact resistance with values less than 1 Ω mm Ohmic behavior still maintained after 50 h of thermal treatment. No deterioration in the sheet resistance of the heterostructure has been detected upon thermal aging. Atomic force microscopy, Auger electron spectroscopy, and transmission electron microscopy characterizations have been utilized to identify the effect of FL-Si incorporation on the nature of intermetallic and interfacial reactions. Results from this study demonstrate that FL-Si-based metallizations have the potential to meet the critical requirements of low resistance, high temperature thermal stability and smooth surface morphology for the fabrication of AlGaN/GaN HEMTs.
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U2 - 10.1116/1.2437161
DO - 10.1116/1.2437161
M3 - Article
VL - 25
SP - 324
EP - 333
JO - Journal of Vacuum Science & Technology B: Microelectronics Processing and Phenomena
JF - Journal of Vacuum Science & Technology B: Microelectronics Processing and Phenomena
SN - 1071-1023
IS - 2
ER -