High-speed laser edge deletion (LED) for thin-film solar module production

The TOPAZ LED from 4JET has been developed as a 24/7 inline production tool especially for the mass production of thin-film solar modules. It combines high accuracy with flexibility to realize any edge deletion layout. The TOPAZ LED requires a minimum of maintenance, is characterized by a robust and reliable granite-based system design and ensures a high uptime. In terms of throughput and availability, it achieves the highest performance in its class.

Granite for long-term Stability and Accuracy

The TOPAZ LED system is based on a granite portal with linear axes. The substrate is gripped on one or both sides and moved back and forth in the system at high speed. A stationary granite bridge carries the axis of the structuring head and is mounted underneath the substrate, enabling high throughput glass side structuring (GS). To achieve laser edge deletion along all glass edges, the glass is moved while the laser edge deletion head is at rest and vice versa. Even the removal of stripes in the middle of the glass is possible.  The glass substrate is supported against bending during its movement to ensure stability and especially a stable focal plane for the laser. Accuracy, robustness and process stability are achieved by the granite base and its excellent vibration damping and low coefficient of thermal expansion (CTE). This guarantees a sustainable production of high-precision and high-quality CdTe thin-film solar modules.


ProcessLaser Edge Deletion (LED) typically through the glass lift-off process. Film side processing on request.
Thin film materialsPV layers stacks such as CdTe, Perovskite and CIGS 
Laser sourcesHigh power nanosecond laser
Patterning resolutionSquare spots with approx. 1mm²; others on request
ScanningOn-the-fly with up to two processing heads
Working area (x, y)Up to 2.400 mm x 1.300 mm; other upon request
Substrate dimensionsCustomer specific within machine working area specification
Glass thickness2 mm up to 4 mm, others on request
Position accuracy+/- 200 µm relative to the glass edge
Particle extraction High volume flow, high pressure, high efficiency filtering


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