FSD 01 Detectors Simulation Vs Measurements

Sudip Chatterji and Indian Students(Ghosh P, Bansal Y, Joshi N and Sharma N )

GSI Helmholtz Centre for Heavy Ion Research GmbHSTS Work Group Meeting

10th January 2012

Outline

1. Motivation2. Simulation Vs Measurements

Fluence 1e12 n/cm2

Fluence 1e13 n/cm2

Fluence 3e13 n/cm2

Fluence 1e14 n/cm2

3. Overview & Analysis

1. Motivation

• To study and verify the FSD Detectors IV & CV Characteristics

• To verify the Simulation module for FSD parameters using the models used previously

• Role of space charge effect on the Breakdown voltages• To study and validate different models for annealing

parameter.– To extract Annealing time constants

2.1.1 Simulation Vs Measurements Fluence ø=1e12(n/cm2)

2.1.2 Simulation Vs Measurements Fluence ø=1e12(n/cm2)

• VFD{Measured} ~ 40V

• VFD{Simulated} ~ 44V

• Leakage current almost comparable

• Simulation results holds good

2.2.1 Simulation Vs Measurements Fluence ø=1e13(n/cm2)

2.2.2 Simulation Vs Measurements Fluence ø=1e13(n/cm2)

• VFD{Measured} ~ 12V

• VFD{Simulated} ~ 15V

• Leakage current almost comparable

• Simulation results almost holds good

2.3.1 Simulation Vs Measurements Fluence ø=3e13(n/cm2)

2.3.2 Simulation Vs Measurements Fluence ø=3e13(n/cm2)

• Pink curve => Good Detector – VFD{Measured} ~80 V

– VFD{Simulated} ~ 90V

– Leakage current almost comparable, Simulation results almost holds good

• Red curve => Bad Detector – VFD{Measured} ~ not observed

– Leakage Current much higher than expected.

2.4.1 Simulation Vs Measurements Fluence ø=1e14(n/cm2)

2.4.2 Simulation Vs Measurements Fluence ø=1e14(n/cm2)

• VFD{Measured} & {Simulated} = not observed

• BD {Measured} = 220V • BD {Simulated} = 250V• Leakage current almost

comparable but• Breakdown appear early in

measurements (red & green)• Impact of Qf Observed

– Increasing the Qf Decreases Break Down voltage ( blue to pink ~ 8e11 1e12)

– May be the Qf ~ 3e12 in measured Detectors

3.1 Simulation Vs MeasurementOverview

Measured Values for FSD 01 Simulated Values for FSD 01

3.2 Simulation Vs MeasurementAnalysis

• Simulation results holds good with results from FSD01 Detectors.

• Leakage current is comparable in both the cases • VFD{Measured} ~ VFD{Simulated}

• Type inversion observed after Fluence=1e13 n/cm2

• With some bad detectors, statistics in case of detectors becomes important to verify the simulation results.