SIMS Purity Control for High-Quality PV Silicon Feedstock

Learn how SIMS ensures ultra-low impurity levels in PV silicon feedstock with ppb detection limits, high throughput, and optimized vacuum conditions for solar cell manufacturing.

Purity control in PV Si feedstock (SIMS)

The Application

Silicon solar cell manufacturing relies on high purity photovoltaic (PV) Si feedstock, typically upgraded metallurgical-grade silicon with ≥6 N purity. Ensuring the purity of this raw material is essential for maintaining high device efficiency and yield. Trace impurities—whether light elements, dopants, or metals—can drastically influence solar cell performance, making accurate and quantitative impurity monitoring a critical step in PV production.

The Challenge

PV Si purification must consistently achieve extremely low impurity levels. However, traditional analytical methods struggle with the ultralow detection limits required, especially for light elements (H, C, O, N) and critical Si dopants (B, P, As). Metals such as Fe, Ni, Cu, and Cr can also compromise device performance even at ppb concentrations. Maintaining production quality demands a technique capable of detecting a broad range of contaminants at very low levels—while keeping sample preparation and throughput efficient.

Our Unique Solution

Based on the well-established SIMS technique, the CAMECA IMS 7f-Auto provides a powerful, quantitative solution for purity control in PV silicon feedstock:

Outstanding sensitivity for light elements (H, C, O, N), key dopants (B, P, As), and metallic contaminants (Al, Cr, Fe, Ni, Cu…).
Exceptional detection limits, from ppm down to ppb depending on the species analysed.
Optimized ultrahigh vacuum conditions, combining turbo-molecular pumping and liquid nitrogen trap for best in class light element detection.
High sample throughput, with 4–6 analyses per hour and optional automated storage for up to six sample holders.
Ability to analyse PV Si in its original physical form, minimizing preparation time and streamlining workflows.

This makes the IMS 7f-Auto an indispensable tool for ensuring consistent, high-yield solar-grade silicon production.

Case Study

In a detailed SIMS-based evaluation, PV Si feedstock samples were analyzed to quantify trace element concentrations across light elements, dopants, and metals. The IMS 7f-Auto achieved sub-ppb detection limits for elements like Ca, B, and Al, and ppb-level sensitivity for contaminants such as Fe, Cr, and Ni. Data demonstrate how SIMS reveals subtle variations in purification quality and supports process optimization for new solar cell technologies.

Purity-control-in-PV-Si-feedstock-SIMS-detection limits form

SIMS detection limits in silicon for 15 ng of analyzed material. Throughput: 4-6 analyzes/hour. See also: SIMS analytical technique for PV applications. P. Peres et al. Surface and Interface Analysis.

Best-Fit Product: CAMECA IMS 7f-Auto

The IMS 7f-Auto is optimized for trace element quantification in silicon, offering unmatched detection limits, excellent mass and depth resolution, and high automation for 24/7 operation. Its combination of sensitivity, throughput, and ease of use makes it the ideal instrument for PV manufacturers and research labs looking to enhance quality control and accelerate innovation.

Learn More

Ensure the purity and reliability of your PV silicon feedstock.

👉 Contact our experts today to discuss your analytical needs, request a demo, or obtain detailed technical specifications.

👉 Download the IMS 7f-Auto brochure and access our documentation, blogs and webinars to explore performance data and real-world case studies.