Selective Passivation of GeO2/Ge Interface Defects in Atomic Layer Deposited High-k MOS Structures
McIntyre, Paul C
ACS Applied Materials & Interfaces
MetadataShow full item record
Zhang, L., Li, H., Guo, Y., Tang, K., Woicik, J., Robertson, J., & McIntyre, P. C. (2015). Selective Passivation of GeO2/Ge Interface Defects in Atomic Layer Deposited High-k MOS Structures. ACS Applied Materials & Interfaces, 7 37-20506. https://doi.org/10.1021/acsami.5b06087
Effective passivation of interface defects in high-k metal oxide/Ge gate stacks is a longstanding goal of research on germanium metal-oxide-semiconductor devices. In this paper, we use photoelectron spectroscopy to probe the formation of a GeO2 interface layer between an atomic layer deposited Al2O3 gate dielectric and a Ge(100) substrate during forming gas anneal (FGA). Capacitance- and conductance-voltage data were used to extract the interface trap density energy distribution. These results show selective passivation of interface traps with energies in the top half of the Ge band gap under annealing conditions that produce GeO2 interface layer growth. First-principles modeling of Ge/GeO2 and Ge/GeO/GeO2 structures and calculations of the resulting partial density of states (PDOS) are in good agreement with the experiment results.
Al2O3, Ge, high-k, interface traps
This work was supported in part by the Stanford Initiative for Nanoscale Materials and Processes (INMP). This work was performed at the National Synchrotron Light Source and the Stanford Synchrotron Radiation Laboratory, which are supported by the US Department of Energy. Additional support was provided by the National Institute of Standards and Technology.
External DOI: https://doi.org/10.1021/acsami.5b06087
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253628