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Title Charge collection studies in irradiated HV-CMOS particle detectors
Author(s) Affolder, A (Liverpool U.) ; Andelković, M (Nis U.) ; Arndt, K (Oxford U.) ; Bates, R (Glasgow U.) ; Blue, A (Glasgow U.) ; Bortoletto, D (Oxford U.) ; Buttar, C (Glasgow U.) ; Caragiulo, P (SLAC) ; Cindro, V (Stefan Inst., Ljubljana) ; Das, D (Rutherford) ; Dopke, J (Rutherford) ; Dragone, A (SLAC) ; Ehrler, F (KIT, Karlsruhe) ; Fadeyev, V (UC, Santa Cruz, Inst. Part. Phys.) ; Galloway, Z (UC, Santa Cruz, Inst. Part. Phys.) ; Gorišek, A (Stefan Inst., Ljubljana) ; Grabas, H (UC, Santa Cruz, Inst. Part. Phys.) ; Gregor, I M (DESY) ; Grenier, P (SLAC) ; Grillo, A (UC, Santa Cruz, Inst. Part. Phys.) ; Hommels, L B A (Cambridge U. (main)) ; Huffman, T (Oxford U.) ; John, J (Oxford U.) ; Kanisauskas, K (Oxford U. ; Glasgow U.) ; Kenney, C (SLAC) ; Kramberger, G (Stefan Inst., Ljubljana) ; Liang, Z (UC, Santa Cruz, Inst. Part. Phys.) ; Mandić, I (Stefan Inst., Ljubljana) ; Maneuski, D (Glasgow U.) ; McMahon, S (Oxford U. ; Rutherford) ; Mikuž, M (Stefan Inst., Ljubljana ; Ljubljana U.) ; Muenstermann, D (Lancaster U.) ; Nickerson, R (Oxford U.) ; Perić, I (KIT, Karlsruhe) ; Phillips, P (Oxford U. ; Rutherford) ; Plackett, R (Oxford U.) ; Rubbo, F (SLAC) ; Segal, J (SLAC) ; Seiden, A (UC, Santa Cruz, Inst. Part. Phys.) ; Shipsey, I (Oxford U.) ; Song, W (Beijing, Inst. High Energy Phys.) ; Stanitzki, M (DESY) ; Su, D (SLAC) ; Tamma, C (SLAC) ; Turchetta, R (Rutherford) ; Vigani, L (Oxford U.) ; Volk, J (UC, Santa Cruz, Inst. Part. Phys.) ; Wang, R (Argonne, HEP) ; Warren, M (University Coll. London) ; Wilson, F (Rutherford) ; Worm, S (Rutherford) ; Xiu, Q (Beijing, Inst. High Energy Phys.) ; Zavrtanik, M (Stefan Inst., Ljubljana) ; Zhang, J (Argonne, HEP) ; Zhu, H (Beijing, Inst. High Energy Phys.)
Publication IOP, 2016
Number of pages 18
In: JINST 11 (2016) P04007
DOI 10.1088/1748-0221/11/04/P04007
Subject category Detectors and Experimental Techniques
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Project CERN HL-LHC
Abstract Charge collection properties of particle detectors made in HV-CMOS technology were investigated before and after irradiation with reactor neutrons. Two different sensor types were designed and processed in 180 and 350 nm technology by AMS. Edge-TCT and charge collection measurements with electrons from $^{90}$Sr source were employed. Diffusion of generated carriers from undepleted substrate contributes significantly to the charge collection before irradiation, while after irradiation the drift contribution prevails as shown by charge measurements at different shaping times. The depleted region at a given bias voltage was found to grow with irradiation in the fluence range of interest for strip detectors at the HL-LHC. This leads to large gains in the measured charge with respect to the one before irradiation. The increase of the depleted region was attributed to removal of effective acceptors. The evolution of depleted region with fluence was investigated and modeled. Initial studies show a small effect of short term annealing on charge collection.
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