Sheet Resistance

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Sheet Resistance

In a regular three-dimensional conductor, the Resistance can be written as
:

R=
horac{L}{A} = 
horac{L}{W t}

where

ho

is the resistivity,

A

is the cross-sectional area and

L

is the length. The cross-sectional area can be split into the width

W

and the sheet thickness

t

.

By grouping the resistivity with the thickness, the resistance can then be written as

:

R = rac{
ho}{t} rac{L}{W} = R_s rac{L}{W}

R_s

is then the sheet resistance. Because it is multiplied by a dimensionless quantity, the units are technically ohms. The term ohms/square is used because it gives the resistance in ohms of current passing from one side of a square region to the opposite side, regardless of the size of the square.