Quantum leap for transistors

Called a near broken-gap tunnel field effect transistor (TFET), the new device uses the quantum mechanical tunnelling of electrons through an ultrathin energy barrier to provide high current at low voltage.

Penn State, the US National Institute of Standards and Technology and IQE, a specialty wafer manufacturer, jointly presented their findings at the International Electron Devices Meeting in Washington, D.C.

According to Penn State, tunnel field effect transistors are considered to be a potential replacement for current CMOS transistors, as device makers search for a way to continue shrinking the size of transistors and including more transistors into a given area.

The main challenge facing current chip technology is that as size decreases, the power required to operate transistors does not decrease in step.

The results can be seen in batteries that drain faster and increasing heat dissipation that can damage delicate electronic circuits.

Various new types of transistor architecture using materials other than the standard silicon are being studied to overcome the power consumption challenge.

In a statement lead author and Penn State graduate student Bijesh Rajamohanan said: ‘This transistor has previously been developed in our lab to replace MOSFET transistors for logic applications and to address power issues.

‘In this work we went a step beyond and showed the capability of operating at high frequency, which is handy for applications where power concerns are critical, such as processing and transmitting information from devices implanted inside the human body.’

For implanted devices, generating too much power and heat can damage the tissue that is being monitored, while draining the battery requires frequent replacement surgery.

The researchers, led by Suman Datta, professor of electrical engineering, tuned the material composition of the indium gallium arsenide/gallium arsenide antimony so that the energy barrier was close to zero – or near broken gap, which allowed electrons to tunnel through the barrier when desired.

To improve amplification, the researchers moved all the contacts to the same plane at the top surface of the vertical transistor.

This device was developed as part of a larger program sponsored by the National Science Foundation through the Nanosystems Engineering Research Center for Advanced Self-Powered Systems of Integrated Sensors and Technologies (NERC-ASSIST).

The broader goal of the ASSIST program is to develop battery-free, body-powered wearable health monitoring systems.

The paper, “Demonstration of InGaAs/GaAsSb Near Broken-gap Tunnel FET with Ion=740µA/µm, GM=700µS/µm and Gigahertz Switching Performance at VDS=0.5V,” will be available in the conference proceedings publication of the IEDM.