About us

G-ray is a development stage company, based in the State of Neuchâtel, Switzerland, created in November 2014, with validated core competences in monolithic CMOS integrated pixel array detector technology.

The company addresses a large unmet medical need for low dose X-ray medical applications and brings deep expertise in the areas of:

  1. compounds with ultra-high sensitivity
  2. manufacturing methods including a direct bonding technology and the epitaxial growth of defect-free silicon-germanium absorber structures on silicon.

Highly Qualified Partners


G-ray is focusing on the development and commercialization of detectors, primarily for medical X-ray applications, with the aim to reduce the exposure to ionizing radiation, while providing high resolution images.

For applications requiring low-energy X-ray beams, pixel detectors with silicon (Si) sensors are now considered as the best technology available. By adding semiconductors with higher atomic number such as germanium (Ge), it is possible to substantially increase their sensitivity at energy ranges suitable for the medical sector.

Recently, the feasibility of growing Ge layers thick enough for efficient X-ray detection on CMOS processed Si wafers could be demonstrated. This breakthrough allows ultra-high-sensitivity paired with an excellent energy and micrometric resolution. It may also be considered as a key enabler to improved and safer X-ray medical imaging procedures, particularly in the field of mammography. Based on these scientific advances, G-ray’s business model provides a vertically integrated technology offering to customers, from the epitaxial growth of SiGe alloys -or alternative high-Z materials- to finished products or detectors, including software, electronics and application specific integrated circuits. The new technology – including software-defined virtualized detectors – has an open architecture configurable for any equipment already in use. This pixel array detector of a new kind allows energy-resolved X-ray imaging, ultra-high-speed image capture and storage, modulated frame rate, zooming and streaming.

G-ray Disruptive Techniques

  • Direct Ge growth on CMOS processed silicon wafers
  • New interconnect technique (no bump bonding)
  • New photodiodes for X-rays
Germanium on top of Silicium

Germanium demonstrates superior physics.

High sensitivity ➞ excellent energy and spatial resolution

Core Product

Germanium on top of Silicium
G-ray’s core product is a monolithic (= no bump-bonding) CMOS integrated pixel array detector, using a digital direct conversion mode. It relies on (1) a combination of materials that define the sensitivity of the absorption layers (2) smart electronics for signal processing, storage and post-processing (3) a low temperature direct bonding technology without the need of any special high-temperature metallization layers.

Through the combination of the best available technologies, this new type of sensor has unique advantages in terms of spatial, energy and temporal resolution over all present bump-bonded detectors based on planar Si, CdTe or CdZnTe absorbers, as well as the monolithically integrated Si absorbers.

Board of Directors

Daniel Rüfenacht
Daniel RüfenachtCo-founder
MD, PhD. Founder and Head of SwissNeuroInstitute, Hirslanden Clinic in Zurich. Co-founder of ESMINT (European Society of Minimally Invasive Neurological Therapies). Research devoted to development of image guided minimally invasive treatment concerning neurovascular diseases, tumors and back pain. Honorary Professor at Dept. of Cardiovascular Science, University of Sheffield, UK.
Philippe Le Corre
Philippe Le CorreCEO at G-ray Medical Sàrl
Civil Aerospace Engineer, INSEAD and London Business School. Philippe started his career as flight test engineer (till RAFALE A), responsible of the Hermes Space Shuttle project and detached expert towards the European Commission, representing the Aerospace Industry. He then worked for Digital Equipment Corporation, IBM and EDS where he managed high complexity projects, mainly with ERP (SAP) and PLM (Dassault Systemes), with customers like Pechiney, Renault, PSA, Alstom and Saint Gobain.
Patrick Scherrer
Patrick ScherrerCo-founder, Chairman
Former CEO at Widmann Associates (2004-2013), a corporate advisory firm dedicated to venture capital funds (Vinci Capital/Renaissance, Wellington Partners) and corporations. Patrick developed several investments in the technology and life-sciences sectors, including Actelion, Axovan, Endoart, immatics, Sensimed, Symetis, Evolva and Anergis among others.
Robert Bishop
Robert BishopIndependant
Dr h.c., M.Sc. in Mathematical Sciences. Former Chairman and CEO of Silicon Graphics. Founder and President of the International Centre for Earth Simulation in Geneva.
Yves Claude Aubert
Yves Claude Aubert Investors Representative
MBA IMD, Certified Financial Analyst & Portfolio Manager. Pioneer in financial derivatives trading and e-banking. Former Head of Strategic Projects at BCV. Member of several Boards of Directors and Advisory Boards of financial institutions.

Scientific and Medical Advisory Board

Osman Ratib
Osman RatibMedical Advisor
MD, PhD. Head of Nuclear Medicine and Molecular Imaging Division at University Hospital of Geneva. Director of the Institute of Translational Molecular Imaging. Professor Emeritus of Molecular and Medical Pharmacology at UCLA. President of the OsiriX foundation (Open-Source software).
Ulrich Sigwart
Ulrich SigwartMedical Advisor
MD, PhD. Professor and chair of Cardiology Emeritus, University of Geneva. Pioneer in the conception and clinical use of intravascular stents to prevent occlusion/restenosis after angioplasty and in the non-surgical treatment of hypertrophic obstructive cardiomyopathy.
Daniel Rüfenacht
Daniel RüfenachtMedical Advisor, Chairman
Hans von Känel
Hans von KänelCo-founder, Scientific Advisor
PD, PhD. Laboratory of Solid State Physics at ETHZ.
Adolfo Fucci
Adolfo FucciCo-founder, Scientific Advisor
M.Sc. in Electronics. Honorary member of CERN. More than 40 years experience in electronics design of computer architectures, specialised processors, complex readout systems and real-time high-speed data acquisition in prestigious research centres (Olivetti/Italy and CERN). Contribution to technology transfer efforts from research centres to industry.
Alex Dommann
Alex DommannScientific Advisor
Prof. Dr. Head Dept. “Materials meet Life” at Empa. CTI expert for Micro- and Nanotechnology.

Industry Advisory Board

Hans Brändle
Hans BrändleIndustry Advisor
PhD. Solid State Physics. Former CEO of Oerlikon Balzers (2005-2014).
Harry Diepenmaat
Harry DiepenmaatIndustry Advisor
M.Sc. in Integrated Circuits and Electronics, owner and chairman of the Dieco Electronics/Bruco group; co-founder of JIS Nederland, Business Cluster Semiconductors, Innoluce and ShredEDA.