The Quest for Higher Frequency TFTCs

The frequency of Thin Film Transistor Circuits TFTCs needs to be improved for some applications where high speed data transfer is needed, such as RFID tags.

 

TFTC frequency is controlled primarily by the following three parameters:

 

1. Channel length (source to drain),

2. Voltage,

3. Carrier mobility.

 

Of these, there is some scope to improve the physical dimensions by improving low-cost ink jet or roll-to-roll printing. There is little scope to increase voltage because of need for insulation, compatibility with other components etc. With mobility there is scope for improvement of materials and constructions for TFTs and there are also compromises to be chosen. There is a spectrum of choice from a very-low-cost process but with poor mobility to the opposite. See the table below for typical current performance.

 

envisaged). Single crystal silicon may have a figure of up to 1,000 cm2/vs but it is not currently envisaged as a TFTC material.

 

 

 

Source: IDTechEx