Influence of a two-dimensional electron gas on current-voltage characteristics of Al<sub>0.3</sub>Ga<sub>0.7</sub> N/GaN high electron mobility transistors |
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Authors: | Ji Dong a Liu Bing a Lu Yan-Wu a Zou Miao b and Fan Bo-Ling |
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Institution: | School of Science,Beijing Jiaotong University;School of Electronic and Information Engineering,Beijing Jiaotong University |
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Abstract: | The J-V characteristics of AltGa1 tN/GaN high electron mobility transistors(HEMTs) are investigated and simulated using the self-consistent solution of the Schro¨dinger and Poisson equations for a two-dimensional electron gas(2DEG) in a triangular potential well with the Al mole fraction t = 0.3 as an example.Using a simple analytical model,the electronic drift velocity in a 2DEG channel is obtained.It is found that the current density through the 2DEG channel is on the order of 1013 A/m2 within a very narrow region(about 5 nm).For a current density of 7 × 1013 A/m2 passing through the 2DEG channel with a 2DEG density of above 1.2 × 1017 m-2 under a drain voltage Vds = 1.5 V at room temperature,the barrier thickness Lb should be more than 10 nm and the gate bias must be higher than 2 V. |
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Keywords: | two-dimensional electron gas high electron mobility transistor heterointerface nitride semiconductor |
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