PhD Position in Isotope Pure Silicon Epitaxy for Quantum Photonic Chips

The Leibniz-Institut für Kristallzüchtung (IKZ) in Berlin is offering a PhD position (f/m/d) on isotope-pure silicon epitaxy for quantum photonic chips. This interdisciplinary project combines epitaxial crystal growth, nanofabrication, and quantum optics in collaboration with leading European research partners, including CNRS Institut Néel and TUM Center for Quantum Engineering (ZQE).

PhD Details

• Title: PhD Student Position in Isotope-Pure Silicon Epitaxy for Quantum Photonic Chips
• Organization: Leibniz-Institut für Kristallzüchtung (IKZ)
• Reference Code: K 22/25
• Work Location: Berlin, Germany
• Research Field: Semiconductor Materials Science, Nanotechnology, Quantum Photonics
• Contract Type: Fixed-term, 3 years
• Employment Level: 75% (TVöD Bund E13)
• Application Deadline: 30 November 2025
• Start Date: Early 2026
• Contact Person: Dr. Kevin-Peter Gradwohl
• Email:
• Official Website:

About the Project

This PhD position places you at the heart of quantum materials research, exploring the growth and nanoscale control of isotope-pure silicon (²⁸Si) for use in quantum photonic circuits.
The goal is to develop ultra‑clean silicon‑on‑insulator (SOI) structures via molecular beam epitaxy (MBE), enabling erbium (Er³⁺)-based single‑photon sources—a foundational step toward scalable quantum communication and computation.

This research merges semiconductor nanofabrication, epitaxial engineering, and quantum optics, linking material science with quantum technology innovation.

Key Responsibilities

• Develop isotope‑pure silicon epitaxy using molecular beam epitaxy (MBE) systems.
• Optimize strain‑engineered Si/Ge heterostructures for quantum photonics.
• Incorporate erbium ions (Er³⁺) during growth for quantum emitter integration.
• Characterize nanoscale crystal structures using spectroscopy, microscopy, and diffraction techniques.
• Collaborate with top‑tier institutions such as CNRS Institut Néel and TUM’s Quantum Engineering Center (ZQE).

Candidate Profile

Applicants should demonstrate strong motivation for materials research and quantum device engineering. Required qualifications include:

• Master’s degree (or equivalent) in Physics, Chemistry, Materials Science, or a related discipline.
• Knowledge of semiconductor epitaxy, thin‑film growth, and crystal characterization.
• Interest in quantum information science and photonics.
• Proficiency in English (written and spoken).
• Ability to work independently in a collaborative, international research environment.

Experience with vacuum systems, epitaxial tools, or optical spectroscopy will be considered advantageous.

Why Join IKZ Berlin

The Leibniz‑Institut für Kristallzüchtung (IKZ) is a world‑leading facility specializing in crystal growth and purification for semiconductor, quantum, and photonic applications. As part of the Forschungsverbund Berlin and the Leibniz Association, IKZ offers an outstanding platform for early‑career researchers to engage in high‑impact, cross‑disciplinary research.

What you’ll gain:

• Structured PhD training within a renowned German research network.
• Access to state‑of‑the‑art nanofabrication and characterization facilities.
• Integration into international quantum technology collaborations.
• TVöD Bund E13 (75%) salary package with social benefits and 30 vacation days.
• Supportive, inclusive, and flexible work environment.

Research Impact

This position contributes directly to advancing quantum photonic device fabrication and nanostructured semiconductor engineering. By developing isotope‑pure silicon platforms, the project aims to enhance photon coherence, quantum emitter stability, and scalability—key requirements for the next generation of quantum communication systems.

How to Apply

Interested candidates should apply online by 30 November 2025 via the official IKZ job portal.
Apply Now via IKZ Softgarden.

Required Documents:

• Motivation Letter
• Curriculum Vitae (CV)
• Copies of Academic Certificates and Transcripts

Contact for inquiries:

Dr. Kevin-Peter Gradwohl
SiGe-based Quantum Materials Group, IKZ Berlin

Reference Links

• Leibniz-Institut für Kristallzüchtung (IKZ)
• Forschungsverbund Berlin
• Leibniz Association
• Official Job Listing – Apply Online

Disclaimer

This article summarizes a public research vacancy at the Leibniz-Institut für Kristallzüchtung (IKZ) for informational and educational purposes. For the most accurate and updated information, applicants should refer to the official IKZ website or the Softgarden application portal.

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