GaAs Medipix2 hybrid pixel detector

Pasi Kostamo (Corresponding Author), Seppo Nenonen, Sami Vähänen, Lukas Tlustos, Christer Fröjdh, Michael Campbell, Yuri Zhilyaev, Harri Lipsanen

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)


A GaAs Medipix2 hybrid pixel detector based on high purity epitaxial GaAs material was successfully fabricated. The mesa type GaAs sensor with 256×256 pixels and total area of 1.4×1.4 cm2 was made of a 140-μm-thick epitaxial p–i–n structure utilizing reactive ion etching. A final thickness of approximately 110 μm for the all-epitaxial sensor element is achieved by back-thinning procedure. The sensor element is bump bonded to a Medipix2 read-out ASIC. The detector is capable of room temperature spectroscopic operation and it demonstrates the potential of GaAs for high resolution X-ray imaging systems operating at room temperature. This work describes the manufacturing process and electrical properties of the GaAs Medipix2 hybrid detector.
Original languageEnglish
Pages (from-to)174-177
JournalNuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed


  • GaAs
  • Medipix2
  • X-ray imaging


Dive into the research topics of 'GaAs Medipix2 hybrid pixel detector'. Together they form a unique fingerprint.

Cite this