PHYS 551 (Fall 2005): Advanced Semiconductor & MEMS Devices & Technology

Course Project

Device Characterization using MIT-WebLab

By Joseph E. Zekry

Dec. 2005

Instructor: Prof. Moustafa Ghannam

The American University in Cairo

Project Outline

Part 1: pn junction diode

Plotting I-V c/c’s using Weblab

Plotting the Weblab data using MATLAB

Fitting the c/c’s to diode equation & extracting the diode parameters

Part 2: npn BJT

Plotting IC -VCE c/c’s using Weblab & MATLAB

Plotting transfer c/c’s

Determining the transistor parameters & temperature

Determining reverse operation parameters

Part 3: nMOSFET

Plotting output c/c’s

Plotting transfer c/c’s

Determining the transistor parameters

Part 1

PN Junction Diode

Diode characteristics (WebLab)

Linear

Semi-log

Diode characteristics (MATLAB)

Linear

Semi-log

Extracting Diode Parameters

Data obtained by Weblab for the forward operation (Log50 sweep for the diode current between 100nA and 10mA)

Extracting Diode Parameters

Io=2.5nA

! Extracted temperature is greater than actual value “Space charge Rec. factor”

Diode Series Resistance

Part 2

NPN Bipolar Junction Transistor

BJT Output Characteristics

BJT Early Voltage

Data has been fitted to linear equations using MATLAB & the average x-axis intercept is calculated. The Early voltage is approximately 44.36V

Gummel Plots

Transistor Parameters

IS=0.076 pA

IS/βF=0.28 fA

! Temperature estimated more accurately than pn junction

Reverse Active Operation

Reciprocity

Reverse Active Operation

IS=0.347 pA

IS/βR=0.083 pA

! Small

! Large

! Small

Part 3

N-channel MOSFET

Output Characteristics

Channel Length Modulation

Weblab Data

Linear Fitting

Transfer Characteristics

Linear

Saturation

Transfer Characteristics

MOSFET Parameters

Threshold Voltage

Acknowledgement

Thanks to Prof. M. Ghannam (AUC) for his effort in explaining solid state devices throughout the 551 lectures

Thanks to Prof. J. del Alamo & Eng. J. Hardison (MIT) for the opportunity they offered to AUC students to explore the MIT Microelectronics WebLab

Thanks to all 551 class colleagues for the useful discussions we had throughout the Fall-05 semester

Thank You

jzekry@aucegypt.edu

551 Course Project (iLab)

Microelectronics

Joseph E. Zekry

2005-12-25T14:20:30