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calculating the resistance

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icecream

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hi there. I have problem with calculating the resistance of 2 layers of various material (with various resistance and height). The sample of the structure is on the picture. There is no isolation between layers. It's simplified and i don't want the exact calculation, only approach calculation or method.
the width (W) is 10nm for example

Thanks for help
 

To calculate resistance of a material you need to know its 3 dimensions ..
Your pictures shows only two ..
What is the "depth" of these layers?

Regards,
IanP
 

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    icecream

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IanP said:
To calculate resistance of a material you need to know its 3 dimensions ..
Your pictures shows only two ..
What is the "depth" of these layers?
Click to expand...

i'm sorry, width is .. for example 10nm

I know, that the resistance per square i can get calculating the resistance of layer devided with the height of the layer. But i'm not sure that these layers are simply parallel
 

Use the following formula for each layer:

R = ρ * L / A
where:
ρ is resistivity
L is length
A is the cross section

And as both layers are almost in parallel:

R ≈ (Rl1 * Rl2) / (Rl1+Rl2)

Rl1 is the resistance of Layer 1
Rl2 is the resistance of Layer 2

I have deliberately used " ≈ " as this is estimation ..

Regards,
IanP
 

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    icecream

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i've already tried this calculation, but the results doesn't correspond with the measurement of the resistance at all :| because of this i'm not sure, that in this case it's simply question of simply parallel resistors
 

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