GrodiaQ—Large-area diamond substrates for quantum technology

In the joint project GrodiaQ, researchers of Fraunhofer IAF are working together with five industrial partners to develop innovative equipment technology and processes to produce high-purity (111)-oriented diamond wafers with at least 4-inch diameter for quantum technology applications. The partners aim to provide NV-doped diamond substrates in industry-grade quality and quantity for the first time, in order to establish a European supply chain for quantum components and thus overcome dependence on a few manufacturers outside the European Union.

Together, the project partners cover the entire value chain: The industrial partners are responsible for the construction of a novel BEN facility for heteroepitaxy of (111)-oriented diamond on 4-inch wafers, the further processing of the substrates, the evaluation of the results with respect to their applications in quantum sensing and quantum computing, and the transfer of the results to the market. Fraunhofer IAF coordinates the project, provides material, expertise and infrastructure to the project partners and develops functional layers for the substrates in a separate subproject in order to make them usable for quantum technology applications.


GrodiaQ—Large-area diamond substrates for quantum technology



2022 – 2025


Federal Ministry of Education and Research BMBF


Fraunhofer Institute for Applied Solid State Physics IAF


Dr. Peter Knittel


Development of new equipment technology and processes for the fabrication of large area (111)-oriented diamond substrates (wafer diameter: > 4 inch) for quantum devices

  • construction of a BEN reactor for CVD of single crystal (111)-oriented diamond on 4-inch wafers (Evatec Europe)
  • development of semiconductor microwave generators (TRUMPF Hüttinger)
  • manufacturing and further processing (grinding and polishing) of (111)-oriented diamond substrates (Diamond Materials)
  • optimization of substrates for quantum technological applications by development and deposition of functional layers (Fraunhofer IAF)
  • evaluation of the characterized substrates with respect to applications in quantum sensing and computing as well as commercial exploitation afterwards (Q.ANT, Quantum Brilliance)


This project is receiving support by the Federal Ministry of Education and Research.

Further information


“GrodiaQ” Press Release


Learn more about the launch of the project “GrodiaQ” in our press release.


Quantum Computing at Fraunhofer IAF


Find all information about research in quantum computing at Fraunhofer IAF.


Competence Center Quantum Computing

The Competence Center Quantum Computing in Baden-Württemberg connects stakeholders in the state.