Table 2. Literature summary of organic TFTs for which operation at frequencies above 10 MHz has been reported.
Laser: laser lithography; Vertical: vertical transistor; Photo: photo lithography; Stencil: stencil lithography; e-beam: electron-beam lithography; AlN: aluminum nitride; n/a: not applicable; n/r: not reported. If the gate-to-source and gate-to-drain overlaps are not identical, the average gate-to-contact overlap is given. In references (11) and (7), on/off current ratios of 1010 are shown for TFTs with channel lengths of 6 and 8 μm, respectively.
| Reference |
Patterning
method |
Substrate |
Operation
frequency (MHz) |
Operation
voltage (V) |
Normalized
frequency (MHz/V) |
Channel
length (μm) |
Gate
overlap (μm) |
On/off
current ratio |
Subthreshold
swing (V/decade) |
| (17) | Laser | AlN | 160 | 40 | 4.0 | 1.2 | 0.17 | 2 × 102 | 10 |
| (31) | Vertical | Glass | 100 | 4 | 25 | 0.5 | n/a | 5 × 104 | 0.11 |
| (11) | Photo | Glass | 45 | 7 | 6.4 | 1.5 | 1 | n/r | n/r |
| (57) | Vertical | Glass | 40 | 8.6 | 4.7 | 0.2 | n/a | n/r | n/r |
| (12) | Photo | Glass | 38 | 15 | 2.5 | 1.5 | 2 | 2 × 109 | 0.6 |
| (13) | Photo | Glass | 27.7 | 20 | 1.4 | 2 | 2.5 | 1 × 106 | 2 |
| (18) | Laser | Glass | 24 | 15 | 1.6 | 1.4 | 2.7 | 1 × 102 | 9 |
| (18) | Laser | PEN | 22 | 12 | 1.8 | 1.2 | 2.3 | 5 × 101 | 5 |
| (7) | Stencil | PEN | 21 | 3 | 7.0 | 0.6 | 5 | 1 × 109 | 0.066 |
| (14) | Photo | Glass | 20 | 20 | 1.0 | 2 | 1 | n/r | n/r |
| (22) | Stencil | Glass | 20 | 20 | 1.0 | 2.5 | 0.5 | 1 × 108 | 0.8 |
| (58) | Vertical | Glass | 20 | 15 | 1.3 | 0.8 | n/a | 1 × 107 | 1 |
| (19) | Laser | Glass | 20 | 30 | 0.7 | 1.75 | 3 | 5 × 103 | 6 |
| (15) | Photo | Glass | 20 | 10 | 2.0 | 3 | 2.25 | 1 × 109 | 0.3 |
| (16) | Photo | Glass | 19 | 10 | 1.9 | 2 | 2 | 1 × 108 | 1 |
| (20) | Laser | Glass | 19 | 12 | 1.6 | 1.2 | 2.3 | 5 × 104 | 2 |
| (21) | Laser | PEN | 14.4 | 7 | 2.1 | 1 | 1.7 | 1 × 102 | 1 |
| (13) | Photo | Glass | 11.4 | 20 | 0.6 | 2 | 2.5 | 1 × 106 | 1 |
| (23) | Stencil | PEN | 10.4 | 3 | 3.5 | 0.85 | 5 | 1 × 108 | 0.07 |
| This work | e-beam | Glass | 12.5 | 2 | 6.2 | 0.2 | 0.1 | 4 × 107 | 0.07 |