Used ThinkLsaer SigmaClean

SigmaClean is the most clearly positioned "soft marking" system from ThinkLaser, specifically engineered for semiconductor wafer identification applications that demand stringent cleanliness standards. While it belongs to the same soft-marking product family as the SC300, the two systems differ in terms of supported wafer sizes and specific configurations: SigmaClean is primarily designed for 100mm to 200mm wafers, whereas the SC300 is tailored for 300mm advanced manufacturing processes.

Core Value Proposition: No Wafer Damage, No Debris Generation

The fundamental value of SigmaClean lies in the fact that it does not remove any substrate material. Traditional laser marking creates indentations by ablating material—a process that inherently risks the generation of debris. In contrast, SigmaClean utilizes a soft-marking process that alters only the optical properties of the wafer surface to form legible marks, thereby eliminating the source of particulate contamination at the fundamental level. This characteristic renders the system **Class 1 cleanroom-compatible**, allowing for direct deployment within the most demanding, high-purity production environments.

Technical Features

The system is equipped with a proprietary diode-pumped laser renowned for its exceptional stability. It enables the placement of multiple identification codes in any orientation within a 25mm-wide annular zone along the wafer's periphery. The resulting marks are clear and legible, support OCR (Optical Character Recognition) scanning, and fully comply with SEMI traceability standards—ensuring that a wafer’s identity remains verifiable throughout subsequent manufacturing stages.

Relationship with the SC300

Both systems are part of ThinkLaser’s soft-marking product line and share the core "debris-free" technology known as SuperSoftMark®. The selection logic is straightforward: choose SigmaClean for production lines handling wafers up to 200mm, and opt for the SC300 for 300mm advanced manufacturing processes. As a long-proven, mature model within the series, SigmaClean offers an optimal balance between cost-effectiveness and high legibility, making it a pragmatic choice for achieving clean, reliable traceability on small-to-medium-sized wafers.