Table 1 Suggested optimal geometric aspect ratios.

From: Optimisation of geometric aspect ratio of thin film transistors for low-cost flexible CMOS inverters and its practical implementation

Channel

VDD

(V)

Total area

(W/L)p

(W/L)n

\(\frac{{I_{{{\text{min}},{\text{p}}}} \;{\text{(A)}}}}{{I_{{{\text{min}},{\text{n}}}} \;{\text{(A}})}}\)

\(\frac{{I_{{{\text{max}},{\text{n}}}} \;{\text{(A)}}}}{{I_{{{\text{max}},{\text{p}}}} \;{\text{(A}})}}\)

\(\frac{I_{{\text{p}} \;{\text{(A)}}}}{{I_{{{\text{stat}}}} \;{\text{(A}})}}\)

References

Total area

(W/L)p

(W/L)n

\(\frac{{{I}_{{{\text{min}},{\text{p}}}} \;{\text{(A)}}}}{{I_{{{\text{min}},{\text{n}}}} \;{\text{(A}})}}\)

\(\frac{{I}_{{{\text{max}},{\text{n}}} \;{\text{(A)}}}}{{I_{{{\text{max}},{\text{p}}}} \;{\text{(A}})}}\)

\(\frac{{I}_{{\text{p}}} \;{\text{(A)}}}{{I_{{{\text{stat}}}} \;{\text{(A}})}}\)

p

n

(W/L)p+(W/L)n

(W/L)p+(W/L)n

Actual values

 

Suggested optimal values (perfectly matched)

SnO

a-ISO

10

120

100

\(\frac{{{2}00{\text{n}}}}{{0.4{\text{n}}}} = 500\)

\(\frac{40\upmu }{{31\upmu }} = 1.3\)

\(\frac{17\upmu }{{0.2\upmu }} = 85(110)*\)

This work

25 (40)

5 (20)

\(\frac{{10{\text{n}}}}{{0.4{\text{n}}}} = 25\)

\(\frac{40\upmu }{{1.6\upmu }} = 25\)

\(\frac{1.5\upmu }{{10{\text{n}}}} = 148({\it 25{,}000})\)

20

20

5

40

20

\(\frac{{40{\text{n}}}}{{0.4{\text{n}}}} = 100\)

\(\frac{5.4\upmu }{{1.3\upmu }} = 4\)

\(\frac{1.1\upmu }{{40{\text{n}}}} = 26(28)*\)

24 (40)

4 (20)

\(\frac{{8{\text{n}}}}{{0.4{\text{n}}}} = 20\)

\(\frac{5.4\upmu }{{0.26\upmu }} = 21\)

\(\frac{0.25\upmu }{{8.4{\text{n}}}} = 30({\it 3300})\)

20

20

SnO

ZnO

8

6

5

\(\frac{{750{\text{n}}}}{{0.3{\text{n}}}} = 2500\)

\(\frac{2.6\upmu }{{2.7\upmu }} = 1\)

\(\frac{1.3\upmu }{{0.8\upmu }} = 1.7\)

27

1.1 (2)

0.1 (1)

\(\frac{{15{\text{n}}}}{{0.3{\text{n}}}} = 50\)

\(\frac{2.6\upmu }{{0.05\upmu }} = 50\)

\(\frac{0.05\upmu }{{15{\text{n}}}} = 3.5({\it 2200})\)

1

1

SnO

IGZO

5

7

6

\(\frac{{5{\text{n}}}}{{0.1{\text{n}}}} = 50\)

\(\frac{3\upmu }{{8\upmu }} = 0.4\)

\(\frac{2.2\upmu }{{5.1{\text{n}}}} = 420\)

22

1.5 (2)

0.5 (1)

\(\frac{{0.4{\text{n}}}}{{0.1{\text{n}}}} = 4\)

\(\frac{3\upmu }{{0.7\upmu }} = 4\)

\(\frac{0.6\upmu }{{0.5{\text{n}}}} = 1100({\it 7500})\)

1

1

SnO

IGZO

2

4

3

\(\frac{{3{\text{n}}}}{{0.1{\text{n}}}} = 30\)

\(\frac{0.8\upmu }{{0.6\upmu }} = 1.3\)

\(\frac{0.4\upmu }{{3.1{\text{n}}}} = 114\)

30

1.66 (2)

0.66 (1)

\(\frac{{0.66{\text{n}}}}{{0.1{\text{n}}}} = 6.6\)

\(\frac{0.8\upmu }{{0.12\upmu }} = 6.6\)

\(\frac{0.1\upmu }{{0.76{\text{n}}}} = 137({\it 2000})\)

1

1

Pentacene organic

F16CuPc organic

1.5

36.6

3.3

\(\frac{{1{\text{p}}}}{{0.1{\text{n}}}} = 0.01\)

\(\frac{0.6\upmu }{{0.3\upmu }} = 2\)

\(\frac{0.2\upmu }{{0.1{\text{n}}}} = 1980\)

11

5.7 (6.6)

3.3

\(\frac{{1{\text{p}}}}{{7{\text{p}}}} = 0.14\)

\(\frac{{42{\text{n}}}}{0.3\upmu } = 0.14\)

\(\frac{0.04\upmu }{{8{\text{p}}}} = 4600({\it 75{,}000})\)

33.3

2.4 (3.3)

  1. *Hysteresis.
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