Defect evaluation in InGaAs field effect transistors with HfO2 or Al2O3 dielectric

Summary, in English

The performance of InGaAs metal oxide semiconductor field effect transistors with Al2O3 or HfO2 as gate oxide is evaluated and compared. The Al2O3 transistors show the lowest subthreshold slope and mid gap D-it, however, the HfO2 transistors reach a higher maximum transconductance (g(max)) due to the higher oxide capacitance. Both high-kappa dielectrics show a g(m)-frequency dispersion due to tunneling into border traps with a negligible activation energy as determined from temperature dependent measurements. The total amount of trapped charge at border traps is lower in the HfO2 devices. Scaling the HfO2 thickness further reduces the g(m)-frequency dispersion, possibly due to detrapping to the gate electrode. (C) 2015 AIP Publishing LLC.

• Author: Guntrade Roll; Jiongjiong Mo; Erik Lind; Sofia Johansson; Lars-Erik Wernersson
• Department/s: Department of Electrical and Information Technology; NanoLund: Centre for Nanoscience
• Publishing year: 2015
• Language: English
• Publication/Series: Applied Physics Letters
• Volume: 106
• Issue: 20
• Links: http://dx.doi.org/10.1063/1.4921483
• Document type: Journal article
• Publisher: American Institute of Physics (AIP)
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Status: Published
• ISBN/ISSN/Other: ISSN: 0003-6951