What it is
The material is produced from semi-insulating monocrystalline GaAs compensated with chromium and processed into high-resistivity plates. The plates are the basic component for pixelated, energy-resolving sensors of different sizes.
Products / Material
HR-GaAs:Cr sensor material
HR-GaAs:Cr is high-resistivity gallium arsenide compensated with chromium. It converts X-ray photons directly into electric charge at room temperature and is the base of every Zeelta sensor. Our internal name for the material is “TOP”.
Key characteristics
- DQE at 40 keV
- Above 95%
- DQE at 120 keV
- About 75%
- Operating temperature
- Up to 70 °C, no cryogenic cooling
- Radiation resistance
- Up to 10 GGy
- Flat panel size
- Larger than 430 × 430 mm
- Material cost
- About 7.2 USD per gram, roughly 40 times lower than CdTe
Why it matters
Spectral photon counting needs a direct-conversion semiconductor. CdTe and CdZnTe work, but they are expensive and are limited to small tiles. HR-GaAs:Cr offers comparable spectral performance with better response uniformity, scalable production and a much lower cost per gram.
Advantages
- Better spectral performance and response uniformity than common alternatives
- Scalable production process
- Large detector areas suitable for medical imaging
- Available to early adopters, research groups and detector manufacturers
Talk to us
We discuss samples, specifications and joint projects individually. Send a request or write to vvv@zeelta.com.