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Ambient Pressure Photoemission Spectroscopy

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APS04: Scanning, surface photovoltage and surface photovoltage spectroscopy capabilities

The Ambient Pressure Photoemission Spectroscopy (APS) systems are KP Technology's newest addition to our large surface analysis range. The dual-mode APS systems measure the absolute work function of a material by photoemission in air, no vacuum is required. These systems hold domestic and international patents.

With an excitation range of 3.4 eV to 7.0 eV, the APS systems are capable of measuring the absolute work function of metals (accuracy: 0.05 eV) and the ionisation potential of semiconductors alongside measurement of the surface Fermi level with the Kelvin probe (accuracy: 0.001 eV).

With the addition of a surface photovoltage (SPV) and surface photovoltage spectroscopy (SPS), the full bands of semiconductors can be measured in one system; no other product can do this.

Latest materials and applications from publications

Perovskite solar cells, indium zinc tin oxide thin films, diamond electronics, organic solar cells, light-emitting electrochemical cells, organic transistors, alkali oxide thin films, semiconductors.

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Systems & specifications


Kelvin probe 3-axis scanning
Surface Photovoltage
Surface Photovoltage Specroscopy
Tip material / diameter 2 mm gold tip
CPD resolution 1 - 3 meV
Height control (auto) 25 mm automatic
Kelvin probe mode and PE mode CPD and photoemission measurements
CPD measurement time CPD measurements in <1 minute
PE resolution Full photoemission measurement
WF measurement time PE measurements in <5 minutes
DOS measurments Full access to DOS information
Optical system Colour camera with zoom and monitor for positioning
Oscilloscope Digital TFT oscilloscope for real time signal
Test sample Gold, aluminium, and silver test samples
Faraday enclosure base (mm) 450 x 450 mm optical and Faraday enclosure
Control supplied PC control with dedicated software
Patented technology US:8866505 / GB:2439439 / GB:2495998 / EU:2783205 / JP:6018645
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KP Technology
Burn Street, Wick, Caithness, KW1 5EH, Scotland

Telephone: +44 (0)1955 602 777
Fax: +44 (0)1955 602 555
Email: sales@kelvinprobe.com

(c) 2021 KP Technology Ltd

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