KP Technology UHV-KP020 Ultra-High Vacuum Scanning Kelvin Probe
| Origin | UK |
|---|---|
| Manufacturer Type | Distributor |
| Origin Category | Imported |
| Model | UHV-KP020 |
| Price | Upon Request |
| Work Function Resolution | 1–3 meV (with 2–10 mm probe) |
| Probe Diameter Customizable | 2–10 mm |
| Probe Length Customizable | Flange-to-sample distance |
| Vacuum Port | DN40 (2.75″ CF), other sizes optional |
| Manual Translation Stage | 50 mm (100 mm optional) |
| Base Pressure | ≤2×10⁻¹¹ mbar |
| Distance Control | Active electro-mechanical tracking system |
| Capacitance Nulling | Zero-crossing signal detection circuitry |
| Optional Accessories | Motorized translation stage, UHVSKP upgrade kit, Surface Photovoltage modules SPV020 & SPS030 |
Overview
The KP Technology UHV-KP020 Ultra-High Vacuum Scanning Kelvin Probe is a precision surface science instrument engineered for quantitative, non-contact, and non-destructive measurement of local work function (WF) and surface potential (SP) under ultra-high vacuum (UHV) conditions. Based on the vibrating capacitor principle—where a conductive probe oscillates at a fixed frequency above a sample surface, generating an alternating current proportional to the contact potential difference (CPD)—the UHV-KP020 delivers sub-3 meV energy resolution, enabling atomic-scale surface electronic characterization. Its integration into UHV chambers with base pressures down to 2×10⁻¹¹ mbar ensures minimal surface contamination and thermal drift, making it ideal for in situ studies of clean metal surfaces, epitaxial thin films, 2D materials, and passivated semiconductor interfaces. Unlike ambient or low-vacuum Kelvin probes, the UHV-KP020 eliminates adsorbate-induced screening and water-layer artifacts, thereby preserving intrinsic electronic structure fidelity across time-resolved and temperature-dependent measurements.
Key Features
- Sub-3 meV work function resolution—achieved via low-noise electronics, active vibration control, and zero-crossing signal detection that suppresses parasitic capacitance contributions from cabling and chamber walls.
- Modular, user-configurable probe geometry: selectable probe diameter (2–10 mm) and flange-to-sample length to accommodate diverse chamber layouts and sample geometries—including cryogenic stages and multi-source deposition setups.
- Integrated electro-mechanical tracking system maintaining constant probe–sample separation (typically 0.1–2 mm) during scanning, ensuring stable capacitance coupling and eliminating manual re-focusing.
- High-precision linear encoder-equipped translation stage (50 mm standard, 100 mm optional) enabling repeatable raster scanning with ≤1 µm positional reproducibility.
- DN40 (2.75″ CF) UHV-compatible feedthrough; alternative port sizes available for integration into custom or legacy UHV systems (e.g., Omicron, SPECS, Focus GmbH).
- Robust mechanical architecture designed for long-term stability under thermal cycling and ion-bombardment environments typical in surface preparation workflows.
Sample Compatibility & Compliance
The UHV-KP020 supports conductive, semiconducting, and insulating samples—including single-crystal metals (Au(111), Cu(110)), transition metal dichalcogenides (MoS₂, WSe₂), organic monolayers (SAMs), perovskite thin films, and oxide heterostructures. Its non-contact operation avoids surface charging, tip-induced band bending, or mechanical damage—critical for fragile molecular layers or exfoliated flakes. The system complies with ISO 80000-6 (quantities and units for electricity and magnetism), adheres to vacuum integrity standards per ISO 27893, and supports GLP-compliant data acquisition when paired with KP Technology’s certified software suite. All electrical subsystems meet CE/UKCA electromagnetic compatibility (EMC) directives, and mechanical components conform to ASTM F2781 for UHV component cleanliness and outgassing specifications.
Software & Data Management
Control and analysis are performed via KP Technology’s proprietary KPSuite v4.x, a Windows-based application supporting real-time CPD mapping, automated calibration routines (e.g., Fermi-level referencing using Au(111) or Pt(111) standards), and batch processing of multi-parameter datasets (WF, topography, temperature, gas exposure). Raw data are stored in HDF5 format with embedded metadata (timestamp, vacuum pressure, probe parameters, stage coordinates), ensuring FAIR (Findable, Accessible, Interoperable, Reusable) principles. Audit trails, user access logs, and electronic signatures comply with FDA 21 CFR Part 11 requirements for regulated environments. Export options include CSV, TIFF (for publication-ready maps), and MATLAB-compatible .mat files. Optional Python API enables integration with custom automation scripts or machine learning pipelines for feature extraction from large-area WF distributions.
Applications
- In situ monitoring of work function evolution during atomic layer deposition (ALD) and molecular beam epitaxy (MBE) growth.
- Quantitative assessment of dipole formation at organic/inorganic interfaces—e.g., self-assembled monolayers on ITO or graphene transfer substrates.
- Correlating surface photovoltage (SPV) response with carrier dynamics in photoactive thin films, when coupled with SPV020 (modulated light source + lock-in detection) or SPS030 (pulsed laser excitation).
- Mapping lateral electronic inhomogeneity in van der Waals heterostructures and grain boundaries in polycrystalline perovskites.
- Studying charge transfer kinetics at electrocatalyst surfaces under controlled gas environments (CO, O₂, H₂O).
- Validating theoretical DFT-predicted surface dipoles and interface band alignments.
FAQ
What vacuum level is required to operate the UHV-KP020?
The system is specified for operation at base pressures ≤2×10⁻¹¹ mbar, achievable with standard UHV pumping configurations (ion pumps + NEG + turbomolecular backing). Stable measurements require pressure <5×10⁻¹⁰ mbar during acquisition.
Can the UHV-KP020 be used outside a vacuum environment?
No—it is mechanically and electrically optimized for UHV integration only. Ambient or high-vacuum use compromises resolution, introduces uncontrolled surface adsorption, and risks arcing at operational bias voltages.
Is calibration traceable to national standards?
Yes: KP Technology provides NIST-traceable reference samples (e.g., cleaned Au(111) with certified WF = 5.47 ± 0.02 eV at 300 K) and documented calibration protocols aligned with ISO/IEC 17025 laboratory accreditation requirements.
How does the tracking system maintain probe–sample distance?
A closed-loop piezoelectric actuator adjusts probe height in real time based on feedback from the demodulated AC current amplitude, compensating for thermal drift and mechanical creep with sub-nanometer positional stability.
Are firmware and software updates included post-purchase?
Yes—customers receive 3 years of complimentary maintenance, including security patches, bug fixes, and minor feature enhancements. Extended support contracts are available upon request.
