AI Insight
Researchers developed a simplified method for fabricating active edge silicon sensors using side ion implantation and microwave annealing to create highly doped edges. Traditional silicon detectors require insensitive areas around their edges for guard rings, but this new technique allows for reduction or elimination of these dead zones by extending the doped backside material up the device sidewalls. Testing and TCAD simulations showed significant improvement in edge leakage current compared to conventional methods, demonstrating the feasibility of this less complex and less expensive approach.
Why it matters
This simplified fabrication process could make active edge sensors more accessible and cost-effective for applications in high-energy physics experiments, X-ray detection systems, and medical imaging devices where maximizing the sensitive detector area is critical for improving image quality and detection efficiency.
Understand the Science
Abstract: Silicon detectors typically require an insensitive area around their periphery to accommodate guard rings, which help maintain the electric field uniformity around edge pixels and isolate the high leakage current from the physical edges of the detector. Minimization of this insensitive region is desirable for applications in high-energy physics, X-ray experiments, and medical imaging. Existing active edge technology offers a solution for reduction or total elimination of the insensitive region, via a continuation of the highly doped backside up the sidewalls of the device. However, current methods for realizing this technology are complex and expensive. We propose a new technique that simplifies the fabrication of highly doped edges using side ion implantation and microwave annealing. Tests demonstrating the feasibility of this proposed process were performed on a set of sensors, and current versus bias voltage measurements probing the edge effects were performed before and after the edge implantation and annealing. To aid in interpretation of the results, TCAD simulations of the test devices were performed. Significant improvement in the edge leakage current is observed, indicating the promise of this simplified process for fabrication of active edge sensors.