On The Role Of The Interface Charge In Non-Ideal Metal-Semiconductor Contacts

Details On The Role Of The Interface Charge In Non-Ideal Metal-Semiconductor Contacts On The Role Of The Interface Charge In Non-Ideal Metal-Semiconductor Contacts

2004-10-15

arxiv.org/abs/cond-mat/0410392v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1016/j.apsusc.2004.12.024

The bias dependent interface charge is considered as the origin of the observed non-ideality in current-voltage and capacitance-voltage characteristics. Using the simplified model for the interface electronic structure based on defects interacting with the continuum of interface states, the microscopic origin of empirical parameters describing the bias dependent interface charge function is investigated. The results show that in non-ideal metal-semiconductor contacts the interface charge function depends on the interface disorder parameter, density of defects, barrier pinning parameter and the effective gap center. The theoretical predictions are tested against several sets of published experimental data on bias dependent ideality factor and excess capacitance in various metal-semicoductor systems.

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