A 2D TCAD-based approach is proposed to investigate the leakage current and breakdown regime of GaN/AlGaN/Si structures at different ambient temperatures. Deep-level traps originated by Carbon doping, impact-ionization generation and thermally activated Poole-Frenkel conduction have been modeled to assess the role of such physical mechanisms on the forward-bias leakage current. A good agreement with experimental data has been obtained by implementing conduction and valence mini-bands within the deeper transition layer created by conductive dislocation defects or by superlattice structures. A 2D isolation device has been investigated up to breakdown and, for the first time to our knowledge, we prove with 2D TCAD simulation that in GaN based devices both impact-ionization and Poole-Frenkel conduction effects must be taken into account to correctly match experimental data.

Numerical investigation of the lateral and vertical leakage currents and breakdown regimes in GaN-on-Silicon vertical structures

CORNIGLI, DAVIDE;REGGIANI, SUSANNA;GNANI, ELENA;GNUDI, ANTONIO;BACCARANI, GIORGIO;MENEGHESSO, GAUDENZIO
2015

Abstract

A 2D TCAD-based approach is proposed to investigate the leakage current and breakdown regime of GaN/AlGaN/Si structures at different ambient temperatures. Deep-level traps originated by Carbon doping, impact-ionization generation and thermally activated Poole-Frenkel conduction have been modeled to assess the role of such physical mechanisms on the forward-bias leakage current. A good agreement with experimental data has been obtained by implementing conduction and valence mini-bands within the deeper transition layer created by conductive dislocation defects or by superlattice structures. A 2D isolation device has been investigated up to breakdown and, for the first time to our knowledge, we prove with 2D TCAD simulation that in GaN based devices both impact-ionization and Poole-Frenkel conduction effects must be taken into account to correctly match experimental data.
2015 IEEE International Electron Devices Meeting (IEDM)
5.3.1
5.3.4
Cornigli, Davide; Reggiani, Susanna; Gnani, Elena; Gnudi, Antonio; Baccarani, Giorgio; Moens, Peter; Vanmeerbeek, Piet; Banerjee, Abhishek; Meneghesso, Gaudenzio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/588892
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