1. Improved source design for p-type tunnel field-effect transistors: Towards truly complementary logic.
- Author
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Verreck, Devin, Verhulst, Anne S., Sorèe, Bart, Collaert, Nadine, Mocuta, Anda, Thean, Aaron, and Groeseneken, Guido
- Subjects
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FIELD-effect transistors , *ENERGY consumption research , *HETEROSTRUCTURES , *QUANTUM mechanics , *CONDUCTION bands - Abstract
Complementary logic based on tunnel field-effect transistors (TFETs) would drastically reduce power consumption thanks to the TFET's potential to obtain a sub-60mV/dec subthreshold swing (SS). However, p-type TFETs typically do not meet the performance of n-TFETs for direct bandgap III-V configurations. The p-TFET SS stays well above 60mV/dec, due to the low density of states in the conduction band. We therefore propose a source configuration in which a highly doped region is maintained only near the tunnel junction. In the remaining part of the source, the hot carriers in the exponential tail of the Fermi-Dirac distribution are blocked by reducing the doping degeneracy, either with a source section with a lower doping concentration or with a heterostructure. We apply this concept to n-p-i-p configurations consisting of In0.53Ga0.47As and an InP-InAs heterostructure. 15-band quantum mechanical simulations predict that the configurations with our source design can obtain sub-60mV/dec SS, with an on-current comparable to the conventional source design. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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