Kelvin Probe

Complete Kelvin Probe: Precisely measures Contact Potential Difference (CPD) of both the sample and the tip separately, eliminating CPD ambiguity.

Product SKU Kelvin-Probe Category Brand:

Description

⬛ Complete Kelvin Probe

The Complete Kelvin Probe is an invention by Instytut Fotonowy that addresses a 150-year-old limitation of traditional Kelvin Probes: when a change in Contact Potential Difference (CPD) is observed, it’s unclear whether the change originates from the sample’s Work Function (WF) or from the WF of the probe tip.

The Complete Kelvin Probe is the ultimate CPD measurement device. It performs all the functions of conventional Kelvin Probes but adds the unique capability to measure:

  • The CPD of a sample with respect to the ground

  • The CPD of the tip with respect to the ground

This feature allows users to clearly distinguish the contributions to the sample-tip CPD from both the sample and the tip

Complete Kelvin Probe at Work

Sample-Tip CPD

Sample-Tip Contact Potential Difference (blue) with recorded ambient air temperature (green) and relative humidity (orange):

Sample-ground CPD

Sample-ground Contact Potential Difference (red) with recorded ambient air temperature (green) and relative humidity (orange). It represents only a small fraction of the sample-tip variation.

Tip-ground CPD

Tip-ground Contact Potential Difference (gold) with recorded ambient air temperature (green) and relative humidity (orange). It shows that most of the CPD change is due to the change on the tip’s surface.

Kelvin Probe Modules

The Kelvin Probe set consists of:

  • Controller unit

  • Kelvin Probe instrument with the Probe Tip

  • Faraday Cage

The Kelvin Probe instrument is equipped with:

  • Protective bay to park the Probe Tip after experiment

  • Laser pointer to indicate the area directly

  • Light source that helps to handle the sample when the instrument is covered with the Faraday Cage

  • Laser barrier to precisely detect the Probe Tip distance to the sample

  • Golden Probe Tip

  • Sample holder

  • Motorized XY Table

Probe Tip

The most important part of the Kelvin Probe instrument is the Probe Tip. The reference electrode is made of Au mesh of 2.5 mm in diameter. It provides high signal to noise ratio, even from a distance of 0.5 mm above the sample. Thus, it does not matter if the examined sample surface is rough or polished. The tip oscillations are generated with an electromagnet.

The Probe Tip is the component fully designed and manufactured by Instytut Fotonowy.

Specifications

General:

  • Weight: 15 kg

  • Size: 40x40x45 cm

  • PC connectivity: USB 2.0

  • Power supply: 230 V, 50 Hz or 115 V, 60 Hz

  • Measurement technique: 2-channel lock-in-amplifier

  • Laser barrier to automatically detect the substrate and prevent the tip from running into the sample

  • Auxiliary sensors: humidity, temperature

  • Small lamp

  • Laser pointer for examined point of the surface indication

Sample holders:
Freely shaped solid state with top contact holder
Bottom contact holder
Electrochemical holder

Faraday Cage:

  • Standard / gas-tight with inert gas flow system

Measurement unit:

  • Bias voltage range: -5 ÷ 5 V

  • Voltage measurement resolution: 0.15 mV

  • Current ranges: 300 nA, 30 nA, 3 nA, 300 pA

Probe Tip:

  • Probe Tip type: Au mesh, 2.5 mm in diameter

  • Tip positioning resolution in vertical axis: 20 µm

  • Automated resonance frequency scanning

  • Adjustable oscillation amplitude

  • Automated removal of the parasitic current of the tip

  • Partial transparency for the light

  • Typical CPD measurement distance: 0.2 – 1 mm

XY Table:

  • Motorized, controlled via software

  • Size: 50 x 50 mm

  • Movement range: 50 x 50 mm

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