Results for SCIPP-PRO_LS-0758

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Basic Information for SCIPP-PRO_LS-0758

Brief description of DB components associated to this Module and associated tests


Click for packaging sticker
MetadataValue
Alt Identifier UCSC-BARREL_LS_MODULE-0951
Serial Number 20USBML1239633
Batch PRODUCTION_UCSC
Assembled True
Completed False
Current Location SCIPP, UC Santa Cruz
Manufacture ID SCIPP-PRO_LS-0758
User SCIPP Module Institute Account

Children

Alt IdentifierLocal NameSerial NumberTypeTrashedCompletedTimestamp
B3 2026-06-25T20:55:32.574Z
X 2026-06-25T20:55:32.574Z
VPA39574-W02870 20USBSL0002870 ATLAS18LS False True 2026-06-25T20:55:35.061Z

Parents

ComponentTypeTimestamp
Module Frame 2026-06-25T20:55:36.917Z

NameCurrent StageTimestamp

Test NamePassed?Date
Module IV with PS V1 2026-06-26T17:29:06.525Z
Visual Inspection 2026-06-26T17:29:06.525Z

HVTab IV for SCIPP-PRO_LS-0758

Shown below are results for the HVTab IV 

SensorIVSvc::read                          INFO                Using measurement with voltage 700.160000 and current 0.123070 for current stability calculation
SensorIVSvc::read                          INFO                Using measurement with voltage 700.160000 and current 0.121670 for current stability calculation
SensorIVSvc::read                          INFO                Using measurement with voltage 700.160000 and current 0.121670 for current stability calculation
SensorIVSvc::read                          INFO                Using measurement with voltage 700.160000 and current 0.121670 for current stability calculation
SensorIVSvc::CalculateVBD                  INFO                Average voltage 4.960000, current 0.022400, dIdV 0.002687
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.595089 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 14.920000, current 0.038355, dIdV 0.000525
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.204224 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 24.920000, current 0.043855, dIdV 0.000575
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.326736 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 34.919998, current 0.048460, dIdV 0.000346
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.249326 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 44.930000, current 0.052865, dIdV 0.000534
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.453789 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 54.939999, current 0.056865, dIdV 0.000265
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.256029 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 64.940002, current 0.058065, dIdV -0.000025
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.027960 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 74.970001, current 0.058115, dIdV 0.000035
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.044882 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 84.980003, current 0.058470, dIdV 0.000036
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.052532 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 94.959999, current 0.057875, dIdV -0.000155
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.254321 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 104.989998, current 0.058575, dIdV 0.000293
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.525605 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 115.009995, current 0.060230, dIdV 0.000036
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.068880 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 125.000000, current 0.060835, dIdV 0.000085
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.174653 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 134.990005, current 0.061635, dIdV 0.000075
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.164591 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 144.989990, current 0.061390, dIdV -0.000124
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.292277 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 155.020004, current 0.060595, dIdV -0.000035
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.089184 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 165.050003, current 0.060845, dIdV 0.000085
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.230113 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 175.059998, current 0.061145, dIdV -0.000025
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.071576 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 185.069992, current 0.060995, dIdV -0.000005
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.015141 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 194.990005, current 0.061605, dIdV 0.000129
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.409344 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 204.989990, current 0.063060, dIdV 0.000161
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.523691 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 215.080002, current 0.065705, dIdV 0.000365
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.194798 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 225.080002, current 0.067855, dIdV 0.000065
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.215610 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 235.100006, current 0.069410, dIdV 0.000245
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.829912 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 245.119995, current 0.071215, dIdV 0.000115
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.395827 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 255.130005, current 0.072715, dIdV 0.000185
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.647801 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 265.140015, current 0.074215, dIdV 0.000115
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.410848 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 275.140015, current 0.075170, dIdV 0.000076
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.278178 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 285.149994, current 0.075875, dIdV 0.000065
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.243792 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 295.149994, current 0.075625, dIdV -0.000115
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.449723 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 305.140015, current 0.075080, dIdV 0.000006
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.024385 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 314.990021, current 0.076290, dIdV 0.000243
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.004545 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 324.829987, current 0.076950, dIdV -0.000104
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.439896 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 334.820007, current 0.076705, dIdV 0.000055
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.240077 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 344.830017, current 0.076805, dIdV -0.000035
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.156825 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 354.859985, current 0.076905, dIdV 0.000055
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.252773 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 364.860016, current 0.077310, dIdV 0.000026
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.123198 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 374.850006, current 0.077715, dIdV 0.000055
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.264757 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 384.869995, current 0.078915, dIdV 0.000185
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.900448 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 394.890015, current 0.079920, dIdV 0.000016
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.078899 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 404.889984, current 0.080025, dIdV 0.000005
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.025348 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 414.890015, current 0.080575, dIdV 0.000105
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.539578 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 424.919983, current 0.081875, dIdV 0.000154
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.801224 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 434.950012, current 0.082275, dIdV -0.000075
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.395699 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 444.979980, current 0.082325, dIdV 0.000085
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.457608 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 454.970001, current 0.082480, dIdV -0.000054
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.299669 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 464.950012, current 0.083135, dIdV 0.000185
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.032586 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 474.949982, current 0.085190, dIdV 0.000226
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.262517 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 484.959991, current 0.085045, dIdV -0.000254
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -1.448317 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 494.970001, current 0.085095, dIdV 0.000266
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.544508 and VBD limit 5.500000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 504.959991, current 0.087200, dIdV 0.000156
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.903369 and VBD limit 5.549600
SensorIVSvc::CalculateVBD                  INFO                Average voltage 514.979980, current 0.087455, dIdV -0.000105
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD -0.615831 and VBD limit 5.649800
SensorIVSvc::CalculateVBD                  INFO                Average voltage 525.000000, current 0.087505, dIdV 0.000115
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.689961 and VBD limit 5.750000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 535.000000, current 0.088205, dIdV 0.000025
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.151635 and VBD limit 5.850000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 545.000000, current 0.088705, dIdV 0.000075
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.460797 and VBD limit 5.950000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 554.989990, current 0.089360, dIdV 0.000056
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.348497 and VBD limit 6.049900
SensorIVSvc::CalculateVBD                  INFO                Average voltage 564.979980, current 0.090465, dIdV 0.000165
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.030473 and VBD limit 6.149800
SensorIVSvc::CalculateVBD                  INFO                Average voltage 574.979980, current 0.091420, dIdV 0.000026
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.163525 and VBD limit 6.249800
SensorIVSvc::CalculateVBD                  INFO                Average voltage 584.979980, current 0.091575, dIdV 0.000005
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.031940 and VBD limit 6.349800
SensorIVSvc::CalculateVBD                  INFO                Average voltage 594.989990, current 0.091925, dIdV 0.000065
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.419877 and VBD limit 6.449900
SensorIVSvc::CalculateVBD                  INFO                Average voltage 605.010010, current 0.094175, dIdV 0.000384
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 2.468425 and VBD limit 6.550100
SensorIVSvc::CalculateVBD                  INFO                Average voltage 615.020020, current 0.096275, dIdV 0.000035
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 0.223586 and VBD limit 6.650200
SensorIVSvc::CalculateVBD                  INFO                Average voltage 624.979980, current 0.097280, dIdV 0.000167
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.075075 and VBD limit 6.749800
SensorIVSvc::CalculateVBD                  INFO                Average voltage 634.989990, current 0.099785, dIdV 0.000332
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 2.110693 and VBD limit 6.849900
SensorIVSvc::CalculateVBD                  INFO                Average voltage 645.059998, current 0.102685, dIdV 0.000244
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.532941 and VBD limit 6.950600
SensorIVSvc::CalculateVBD                  INFO                Average voltage 655.080017, current 0.105085, dIdV 0.000235
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 1.464946 and VBD limit 7.050800
SensorIVSvc::CalculateVBD                  INFO                Average voltage 665.100037, current 0.108185, dIdV 0.000383
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 2.357474 and VBD limit 7.151000
SensorIVSvc::CalculateVBD                  INFO                Average voltage 675.130005, current 0.112340, dIdV 0.000445
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 2.674977 and VBD limit 7.251300
SensorIVSvc::CalculateVBD                  INFO                Average voltage 685.130005, current 0.116345, dIdV 0.000356
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 2.094706 and VBD limit 7.351300
SensorIVSvc::CalculateVBD                  INFO                Average voltage 695.140015, current 0.120595, dIdV 0.000493
SensorIVSvc::CalculateVBD                  INFO                V_avg_BD 2.841937 and VBD limit 7.451400
SensorIVSvc::CalculateVBD                  INFO                Calculated VBD to be 690.119995
SensorIVSvc::read                          INFO                Mean voltage for current stability 0.122020 calculated with 4 points
SensorIVSvc::read                          INFO                RMS current stability 0.004968
IService::UPLOADDB                         INFO                Working on test code MODULE_IV_PS_V1
SensorIVSvc::uploadDB                      INFO                Formatting database upload for MODULE_IV_PS_V1 and run number 1
SensorIVSvc::writeOutput                   INFO                Writing results output file /home/data/output//SensorIV_PostTabIV_PPB_v1//SCIPP-PRO_LS-0758/1//20USBML1239633-HV_TAB_ATTACHED_IV_001.dat
SensorIVSvc::getDate                       INFO                Parsing date 2026-06-26T17:29:06.525+00:00...
SensorIVSvc::getDate                       INFO                Year 2026 
SensorIVSvc::getDate                       INFO                Month 6   
SensorIVSvc::getDate                       INFO                Day 26    
SensorIVSvc::getDate                       INFO                Hour 17   
SensorIVSvc::getDate                       INFO                Minute 29 
SensorIVSvc::getDate                       INFO                Second 6  
SensorIVSvc::getDate                       INFO                Offset 0:0
SensorIVSvc::getDate                       INFO                Converted month into string Jun
SensorIVSvc::getDate                       INFO                FINALLY obtained 26 Jun 2026
IService::UPLOADDB                         INFO                Working on test code VISUAL_INSPECTION
SensorIVSvc::uploadDB                      INFO                Formatting database upload for VISUAL_INSPECTION and run number 1
IService::log                              INFO                Logging status 0111 for component SCIPP-PRO_LS-0758
IService::install                          INFO                Installing output directory to /home/data/modules/SCIPP-PRO_LS-0758/SensorIV_PostTabIV_PPB_v1-1/
IService::install                          INFO                Installed warningLog.txt...
IService::install                          INFO                Installed errorLog.txt...
IService::install                          INFO                Installed infoLog.txt...
IService::install                          INFO                Installed IVCurve.pdf...
IService::install                          INFO                Installed 20USBML1239633-HV_TAB_ATTACHED_IV_001.dat...
IService::install                          INFO                Installed DB_READY_MODULE_MODULE_IV_PS_V1.json...
IService::install                          INFO                Installed DB_READY_MODULE_VISUAL_INSPECTION.json...
IService::install                          INFO                Installed SCIPP-PRO_LS-0758.root...
IService::install                          INFO                Installed status.json...
TopControl::monitor                        INFO                Service with algoirthm name SensorIV_Module_PPB_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name SensorIV_AMACIV_PPB_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name SixWayJig_Y_slots ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name HybridMetrology ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name HybridPanelMetrology ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name HybridPanelMetrology_v7 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name HybridMetrology_v8 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name HybridMetrology_Y_v8 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyHybrid_v10 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyHybrid_v10-beta ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyHybrid_PROD_X_v2_interposer ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyHybrid_PROD_X_v2_thick_interposer ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyHybrid_PROD_Y_v0_thin_interposer ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_LS_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_SS_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_LS_v1_thin ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_LS_v1_interposer ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_LS_v1_thin_interposer ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_SS_v1_thin ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name MetrologyModules_PROD_SS_v1_thin_interposer ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name ModuleLS_Bow_PPA_v0 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name ModuleSS_Bow_PPA_v0 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name ElectricalHybrids ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name ElectricalHybrids_PPB_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name BurnInHybrids_PPB_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name BurnInHybrids_PROD_v2 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name ElectricalModules_PPA_v1 ignored through users request!
TopControl::monitor                        INFO                Service with algoirthm name TCModules_PROD_v0 ignored through users request!


 
 
 



  

    

    
MetadataValue

    
     

    Component type ATLAS18LS
	 
Operator dh
	 
Date 2026-06-26T17:29:06.525+00:00
	 
Institute UCSC
	 
Power supply CAEN_DT1415ET
	 
Temperarture [C] 19.9
	 
Humidity 1.0
	 
Current per area @500V 0.912
	 
Breakdown voltage 690.120
	 
Current stability (RMS@700V) 0.005

    

  




                    

                    The current measurements are calibrated to a common temperature using the following relationship:
                    $$I_{temp}^{SF} = \left ( \frac{T_{ref}}{T_{meas}} \right )^{2} \times e^{eE_{g}^{Si} \frac{T_{ref}-T_{meas}}{2 k_{B} T_{ref} T_{meas}  }} $$
                    where \( T_{ref} \) is the reference temperature,
                    \( T_{meas} \) is the temperatured measured during the test,
                    \( e \) is the electric charge,
                    \( E_{g}^{Si} \) is the band gap energy of silicon, and
                    \( k_{B} \) is the Boltzman constant