In the world of III-V compound semiconductors, performance starts long before devices ever reach final test. Whether powering high-speed electronics, enabling efficient light sources, or driving advanced photodetectors, these materials demand exceptional crystal quality from the very first processing steps.
Early-stage inspection - right after epitaxy, annealing, or other critical growth processes - plays a decisive role in achieving that quality. Even subtle structural or surface defects introduced at this point can escalate through subsequent layers, affecting device efficiency, lifetime, and overall yield.
That’s why modern III-V manufacturing relies on fast, reliable metrology solutions able to detect and classify defects before they become costly problems. Understanding what appears early in the flow is the first step toward building stable, high-performance devices.

As III-V device structures become more complex, manufacturers need metrology solutions with fast and reliable defect monitoring capacity. Photoluminescence (PL) spectroscopy has become one of the most powerful tools for this purpose.
PL provides a non-destructive, direct, and highly sensitive method for identifying defects across full wafers, making it ideal for monitoring epitaxial layers and substrates in compound semiconductor manufacturing.
This example, measured with Semilab LumIR-2300, reveals slip lines in InP epitaxial wafers - defects that can compromise device performance if not detected early. Wafer-scale PL mapping detects slip line defects with multiple wavelength excitation using high-intensity illumination. Simultaneously, a reflection is measured to distinguish particles and surface features from real crystallographic defects.

Photoluminescence (PL) enables rapid, wafer-scale characterization of III-V materials, revealing critical defects such as slip lines with unmatched sensitivity and speed. Building on that foundation, we’re introducing Semilab’s next-generation metrology solution that brings this capability into device manufacturing: LumIR-2300.
Designed for early-stage inspection in III-V device fabrication, LumIR-2300 delivers fast, non-destructive, full-wafer measurements that help manufacturers catch defects before they impact yield. By identifying structural and electronic defects early, the system reduces production cost while ensuring the high performance and reliability required for advanced electronic and optoelectronic devices.
Designed for InP, GaAs, InGaAs, and other compound semiconductor materials, the LumIR-2300 supports wafer sizes up to 150 mm in a compact footprint. And, as always, it comes backed by our company’s trusted global service and applications support.