Ossila FACT1 User Manual page 69

enabling
innovative electronics
Eq. 27
Unless algorithm optimisation is enabled (see below), the resulting gate-voltage
dependent mobility are plotted and saved with no further data validation. As for the
partition method, the maximum of
The threshold voltage is calculated as the x-intercept of the tangent curve to the maximum
of the derivative
Tip: Derivative method allows the most detailed gate-voltage dependent mobility; however,
it is also the less robust against noise.
3. Linear Fit Method computes the linear fit for the whole experimental data set I
returns the mobility -with the associated threshold voltage- as a single, gate-voltage
independent value .
The threshold voltage is calculated as the x-intercept of the linear fit.
Tip: Use the Fit Optimisation options, see below, to exclude I
comply with the linear fit requirements. Refer to
validity conditions for the linear fit algorithm.
Threshold Voltage specifies the threshold voltage extrapolation method. The available options are:
1. Linear Fit Extrapolation It calculates V
method, see the description of Computation Method controls above.
2. Second Derivative V
current -with respect to the gate voltage- is maximum, i.e.
Eq. 28
3. IV Integration Method is not currently available for OFET/TFT.
On Current ring selector is used to specify at which gate voltage the ON current I
The ON current is the I
DS
value is intrinsically not well-defined and the ON gate voltage is arbitrarily selected. As a rule of
thumb, any voltage V such that V
GS
use the larger (in absolute value) V
To automatically use V
GS End
ON current ring selector. To select a different value for I
enter V using the V input.
ON ON
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.
according to the selected mobility computation
Th
is calculated as the V
Th
current output at which the DUT can be considered fully 'ON'. As such, this
>> V is acceptable as V
GS Th
swept as V
GS ON
as V , select the At Max V_DS option from the drop-down menu of the
ON
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is flagged as the DUT reference mobility.
(V
DS,i GS,i
Mobility Computation
at which the second derivative of the drain
GS
. It is common practice, however, to
ON
.
, select the User option instead and the
ON
(V ), and
DS,i GS,i
) data that do not
for a review of the
must be read.
ON
69