Surf-Cal Particle Size Standards: The Best Calibration Solution for Your Laboratory

Introduction

In the high-precision world of semiconductor manufacturing, accuracy and consistency in particle detection and measurement are paramount. Applied Physics Corporation’s SURF-CAL™ Particle Size Standards represent the gold standard in calibration tools for Scanning Surface Inspection Systems (SSIS).

These precision-engineered standards enable semiconductor manufacturers to maintain consistent quality control across multiple inspection tools and facilities, ensuring that wafer inspection scanners deliver reliable, comparable results regardless of location.

What Are Surf-Cal Particle Size Standards?

Surf-Cal standards consist of polystyrene latex (PSL) microspheres suspended in deionized, filtered water. These microspheres are sized with exceptional precision using Differential Mobility Analyzer (DMA) or other size exclusionary techniques, resulting in extremely tight size distributions.

Each product comes with NIST traceability, providing the reliability and consistency required for critical semiconductor manufacturing processes.

The standards serve as reference materials for calibrating and monitoring the performance of wafer inspection tools from manufacturers like KLA-Tencor, Hitachi, ADE, and Topcon.

By depositing these precisely sized particles on silicon and patterned wafers, engineers can verify that their inspection systems detect particles of specific sizes correctly.

Key Features and Specifications

Available Particle Sizes

Surf-Cal standards are available in a wide range of particle diameters, from 0.047 μm to 3.04 μm, covering the spectrum of critical particle sizes relevant to modern semiconductor manufacturing.

Each size variant offers tightly controlled size distribution, typically within 0.003 μm to 0.026 μm, depending on the particle diameter.

Some of the most popular particle sizes include:

0.047 μm (47 nm) – Critical for leading-edge semiconductor nodes

0.100 μm (100 nm) – Commonly used reference point

Continue from SSIS theory to the calibration standard

Choose the wafer or particle reference used to verify KLA-Tencor Surfscan and other SSIS size-response workflows.

REFERENCE PATH

Surf-Cal is the particle suspension; the deposited wafer is a separate deliverable

Use Surf-Cal when the workflow calls for certified PSL particles in suspension. Use a prepared calibration wafer when deposition geometry and a ready-to-scan substrate are required.

PARTICLE REFERENCE PATH

Keep the particle suspension distinct from the prepared wafer

Surf-Cal is supplied as a PSL suspension. A deposited calibration wafer is a separate deliverable configured around substrate, pattern and scanner objective.

APPLIED PHYSICS TECHNICAL RESOURCE

Continue from the technical question to the application

Particle-size references, PSL and silica standards, count controls, fluorescent particles and instrument-calibration workflows. Product and standards references should be interpreted for the actual instrument, facility, protocol and configuration.