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The transistor results are promising with good mobility values and drive current.
Our results show that the present device operates as a radio-frequency single electron transistor.
The high speed performance of the pnp transistors surpasses the best reported values of this transistor type substantially.
Experimental results obtained for a silicon RF bipolar transistor demonstrate validity of the method.
The superior performance of the composite transistor designs highlight the benefit of the proposed approach.
The transistor design could provide the basis for low-noise radiation-tolerant circuits.
We concluded the circular-gate transistor is more tolerant to radiation than the rectangular-gate transistor.
To the best of the authors' knowledge, this is the first demonstration of a transistor with both f T and f max over 700 GHz on any material system.

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