G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 1 Status of LGAD RD50 projects at.

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Presentation transcript:

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 1 Status of LGAD RD50 projects at CNM

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 2 Outline Gallium Implantation to Enhance the Radiation Hardness of LGAD DetectorsCarbon doping. Strip sensors made of N-rich Silicon (See A. Dierlamm´s Talk). Measurement of the Doping Profile in Low-Gain Avalanche Detectors (see H. Sadrozinski´s talk). Investigation of the properties of thin LGAD(See M. Carulla´s talk and N. Cartiglia´s talk). Investigation of acceptor removal in boron doped silicon wafers and LGAD. To be submitted.

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 3 Rd50 funded project The aim of this RD50 Common Project is to enhance the radiation hardness of Low-Gain Avalanche Detectors (LGAD). Dopants such as Ga or Al form complexes with radiation-induced defects, which may have less impact on device performance, when compared to the boron related defect (B i -O i ) complex.

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 4 Reference Ref: A. Khan et al., “Strategies for improving radiation tolerance of Si space solar cells”, Solar Energy Materials & Solar Cells 75 (2003) 271–276. R C = 0.04 cm -1 for Ga R C = 0.08 cm- 1 for Al R C = 0.15 cm- 1 for B

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 5 Wafer Implantation IonEnergy (keV)Dose(at/cm^2) 1 Ga 160 1,00E ,00E ,00E ,00E ,00E ,00E B701,00E GEANT4 Gallium has lower penetration than Boron, but higher diffusion (with annealing) Pn diodes without multiplication!

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 6

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 7 IV Boron

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 8 CV measurements

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 9 Conclusion and future work do be done (Ga) Wafers are being diced in these days. They should be ready by next Friday. We should discuss distribution of samples. Detectors work well as standard boron doped pn diodes. 4-point probe technique to measure Ga doping concentration (before and after irr.) SIMS measurements to extrapolate doping profiles. Calibration of simulation model for Ga implantation. Irradiation of diodes with neutron and proton (electrons ?)to calculate removal constant to be compared to Boron doped devices.

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 10 Investigation of acceptor removal in boron doped silicon wafers and LGAD We want to use two different technological approaches. Diffusion of C in silicon wafer (bare wafers and n-p diodes) Implantation of C in the multiplication junction.

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 11 Plan for Acceptor Removal study The main idea is that carbon co-doping can reduce the concentration of B-O defects, as a result of the formation of more energetically favorable carbon- oxygen (C-O) complexes. E. Donegani, Comparison between n-type and p-type sensors,RD50 meeting, CERN. RD48- 3rd status report

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 12 Wafer selections at CNM Note: FZ and CZ wafers have different initial C and O concentrations.

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 13 Fabrication plan We will use 4x6 wafers with different resistivities (total 28 wafers). 2x6 wafers will be “doped” in chlorine (DCE dichloroethane) gas to diffuse C into the bulk [1]. [1] L. Fonseca et al., Silicon wafer oxygenation from SiO2 layers for radiation hard detectors, Microelectronics Reliability 40 (2000) Expected concentration of [O] and [C] after diffusion.

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 14 RUN CARBON DOPING WafersTypeThickness (um) Diffusion Time Resistivity (Ohm*cm)Conc at/cm-3 1-2SEN HRP (07/12)28572h> 5000< 2e12 3-4SEN HRP300 (05/12)30072h> 1000< 1e13 5-6SEN MRP300(06/15)30072h> 500< 2e PAA50072h> 10< 1e PAC52572h> 0,1< 3e SEN LRP500(05/15)50072h> 0,01< 8,5e18 R. Wunstorf et al., Investigations of donor and acceptor removal and long term annealing in silicon with different boron/phosphorus ratios, NIM A A 377 (1996) Yichao Wu et al., Suppression of boron-oxygen defects in Czochralski silicon by carbon co-doping, Applied Physics Letters 106, (2015); doi: /

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 15 Diodes The remaining 2x6 wafers (1 set of wafers doped with C) will be processed to make standard n-p diodes. This will be an alternative method to measure Neff before and after irradiation with CV plots. For the high doped wafers the method may be difficult due to the low electrical breakdown expected in the diodes (See simulation below). Mask cnm_629 Simulation Bulk doping

G. PellegriniInstituto de Microelectrónica de Barcelona Status of LGAD RD50 projects at CNM28th RD50 Workshop (Torino) 16 Implantation of C in LGAD The last process that we want to explore at CNM is to enrich with C atoms only the multiplication layer of the LGAD devices. This could be achieved by implanting C only in the first 5-6 um of the wafer surface. Standard mask used in the past for LGAD devices. An optimization with simulation software tools like Silvaco and Sentaurus is necessary before starting the process. Carbon’s high efficiency in trapping silicon self-interstitials can cause the reduction of boron diffusion in C-rich silicon samples and this can lead to a change in the multiplication layer of LGAD sensors during the fabrication process.