Device Technology

Cooler electrons for transistors

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Science  27 Jul 2018:
Vol. 361, Issue 6400, pp. 375
DOI: 10.1126/science.361.6400.375-b

The operating power of field-effect transistors is constrained in part by the minimum change in voltage needed to change the current output. This subthreshold swing (SS) limit is caused by hotter electrons from a thermal electron source leaking over the potential of the gate electrode. Qiu et al. show that graphene can act as a Dirac source that creates a narrower distribution of electron energies. When coupled to a carbon nanotube channel, the decrease in SS would allow the supply voltage to be decreased from 0.7 to 0.5 volts.

Science, this issue p. 387

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