Kevin probe Surface work function analyzer

Introduction

The operation of the Kelvin probe system is based on a non-contact measurement performed by an oscillating capacitor. Its one electrode is a specimen, and the other is oscillating reference electrode, which is a gold grid. The measured value is
referenced to the workfunction of gold (5.1 eV).

The system must be designed to perform various type of surface studies, including: corrosion, adsorption/desorption, surface charging, catalytic activity, surface
photovoltage spectroscopy and other photophysical techniques with photovoltage resolution better than 5 mV.

This surface photovoltage spectrometer is an important tool for studying photocatalysts, organic and inorganic semiconductors, solar cells and other photoactive materials and devices. feasible.

Design

1. The device includes an oscillating gold probe, Z-axis electric platform, electronic control unit and Faraday compartment。

2. Place the sample on a manual or motorized XY stage with a movement range of 1.5 cm in either direction。

3. The probe is connected to the Z-axis platform, which can be moved to the required distance from the sample。

4. Red laser pointer shows where the probe will oscillate during the measurement。

5. The system is covered by a Faraday compartment and can be viewed through a USB microscope and white LED。

6. Liquid waveguide or optic fiber to deliver light to the sample 。

7. During idle or data storage, fragile gold probes are inserted into the protected space to prevent accidental damage。

8. Automatic sample height sensor.