Multiple I-V-Spectra

1. In the Auto panel, shown in Figure 1, set the number of IV-spectra in the array using the Columns and Rows parameters—the number of IV-spectra to be performed in the X and Y directions, respectively (see Table 1).

Figure 1: SCM, TUNA, SSRM, C-AFM: Auto panel

Table 1: SCM, TUNA, SSRM, C-AFM: Auto Panel Parameters 

2. Set the spacing between the columns and rows in the array using the Column step and Row step parameters—which define the distance between two neighboring IV-spectra along the X and Y directions, respectively.
3. Set Mode panel > Trig[ger] threshold and Auto panel > Threshold step to set the trigger currents for an array of IV-spectra. For automated IV-spectra, increment the trigger threshold current in the X-direction:
   1. Set Trig[ger] Threshold to the initial value for the first IV-spectrum in each row.
   2. Increment Trig[ger] threshold according to the value of Threshold step for every subsequent IV-spectrum in each row.

Figure 2: The TUNA Ramp Mode panel

An Example

If a Trig[ger] threshold is 1.0 pA and the Threshold step is 0.1 pA, then subsequent rows of the IV-spectra use a trigger threshold current varying from 1.0, to 1.1, to 1.2,... pA. To execute an array of IV-spectra with the same trigger threshold current, set Trig[ger] threshold to the desired threshold and set Threshold step to 0.0 pA.

To execute an array of IV-spectra, click the Auto ramp toolbar button.

To capture the IV-spectra set Auto panel > Capture to Enabled before starting the array. Each spectrum of the array is saved separately. If Capture is set to Off, the spectra are lost.

Export IV-Spectra

To export IV-spectra in ASCII or any other format offered by the NanoScope software, complete the following steps:

1. Save the current data.
2. Export the saved data. The export function is located in the File > Export > ASCII menu. Refer to the NanoScope Software User Guide for details.

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