The new procedure was developed to ensure the gFETs work correctly before using them in sensors.
Archer has developed ways to electrically operate the gFET sensor – speed, and the direction of the voltage applied to the gate. These factors change how the transistor responds based on the liquids being used and the number of ions in the liquid (tiny, charged particles), ultimately setting the sensitivity and speed of the sensor.
Through this ability, Archer can now use new ways to detect substances under different operating conditions using data analysis and machine learning.
Understanding and changing these aspects allows Archer to potentially produce a sensor that can quickly and accurately detect different substances.
The team also examined how different settings, like the electrical biasing conditions and voltage sweeps, to see how they affect the transistor (gFET) operation. In addition, testing was done on how storing and using the transistor repeatedly impacts its performance, as well as what happens when different liquids are applied to it.
Archer is now looking at how best to address gFET stability and durability issues. They are investigating protection of the transistor by adding special ultrathin coatings and employing precision materials modification steps during the fabrication process. This work will help Archer move to the next phase of developing a sensing method.
Archer has collaborated with several European foundries to develop and test gFETs for the its Biochip and the new procedure will ensure consistency, reliability, and sensitivity with our partners.
In addition, Archer has initiated experiments with semiconductor companies in the US to investigate new processing steps into the gFET fabrication flow. This work is complementary to the fabrication already done in the European foundries and will provide a route to producing more sensitive sensing devices.
This latest work builds on earlier gFET design fabrication milestones, including a multi-project wafer run with a German foundry, a whole four-inch wafer run at a foundry in the Netherlands and a six-inch wafer run at a Spanish foundry.
Archer also recently advanced its Biochip gFET chip design with a significant size reduction, with the miniaturised chip designs sent for fabrication to a foundry partner in the Netherlands.
Commenting on the gFET test work, Greg English, Executive Chair of Archer, said, “The newly developed standard procedure for the extensive testing of gFETs will help improve the manufacture of the Biochip through our European foundry partners. This includes focusing on factors such as voltage settings and the impact of repeated use and liquid exposure. The Archer team discovered that the speed and direction of voltage applied to the gate significantly influence the transistor's response. This finding will aid in developing advanced detection methods using data analysis and machine learning.
“By comparing gFET devices from different suppliers, Archer is identifying the most stable and accurate gFETs for future development activities and final use.”
