Heidelberg 2022 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 9: Detectors and Applications II

ST 9.3: Talk

Thursday, March 24, 2022, 14:30–14:45, ST-H4

Two Photon Absorption - TCT: Characterisation of LGAD and other silicon sensors with a newly developed table-top TPA-TCT system — •Sebastian Pape^{1, 5}, Esteban Currás¹, Marcos Fernández^{1, 2}, Michael Moll¹, Raúl Montero³, F. Rogelio Palomo⁴, Christian Quintana², Ivan Vila², and Moritz Wiehe^{1, 6} — ¹CERN — ²Instituto de Física de Cantabria — ³Universidad del Pais Vasco (UPV-EHU) — ⁴Universidad de Sevilla — ⁵TU Dortmund University — ⁶Universität Freiburg

The Two Photon Absorption – Transient Current Technique (TPA-TCT) uses fs-pulsed infrared lasers, with photon energies below the silicon band gap to only generate excess charge carriers in a small volume (approximately 1µm × 1µm × 20µm) around the focal point of the laser beam. Therefore, a resolution in all three spatial directions is achieved to characterise silicon devices. Following the initial success of the method, a compact TPA-TCT setup was developed at CERN and first measurements were performed. The setup, measurements on non-irradiated and irradiated PIN diodes, and measurements on LGAD sensors with focus on the gain suppression mechanism will be presented.