Suchit Shah MSEE (Electronic Circuits & Semiconductor Devices) Northeastern University BOSTON

Product Test Development

Graduate Research Assistant

Carbon Nanotube Properties ELECTRONIC PROPERTIES Metallic Semiconducting Ballistic Transport MECHANICAL PROPERTIES Can bend to high angles Superior tensile strength ELECTRICAL PROPERTIES +ve change in resistivity at high temperatures while non-metallic behavior at low temperatures Resistance dependent on voltage bias at low temperature due to joule heating and electron scattering.

ELECTRONIC PROPERTIES

Metallic

Semiconducting

Ballistic Transport

MECHANICAL PROPERTIES

Can bend to high angles

Superior tensile strength

ELECTRICAL PROPERTIES

+ve change in resistivity at high temperatures while non-metallic behavior at low temperatures

Resistance dependent on voltage bias at low temperature due to joule heating and electron scattering.

Carbon Nanotube Applications Logic Devices Ref.: Bachtold (1998), Derycke (2001), Javey (2002) Inverter NAND NOR Ring Oscillators (Clockwise): Results of logic devices by gate field modulation of CNT. Schematic of inverter by changing p-type CNT into n-type by PMMA encapsulation

Inverter

NAND

NOR

Ring Oscillators

Carbon Nanotube Applications NEMS (Nano Electro-Mechanical Switch) Ref.: C.M. Leiber (1999), S.W.Lee (2004), S. Sapmas(2003) CNT-based NEMS have been demonstrated by various groups. Prototype devices: Oscillators nanorelays sensors nanotweezers. NEMS switches are believed to have low masses high mechanical quality factors high isolation lower losses (Top): CNT nanotweezer. (Bottom): Schematic of cantilever type CNT based switch.

CNT-based NEMS have been demonstrated by various groups.

Prototype devices:

Oscillators

nanorelays

sensors

nanotweezers.

NEMS switches are believed to have

low masses

high mechanical quality factors

high isolation

lower losses

Low-Level measurement Setup for Carbon Nanotube Use of Guard connections of SMU with triaxial cable & for voltage measurement in a coaxial cable Ref.: Keithley Low Level Measurement Handbook Test setup for low level measurement signal was developed. Current measurements as low as 1pA Voltage measurements upto 100  V Resistance measurements as high as 10G Ω Use of faraday cage to eliminate high frequency disturbances, guard connection in triax cables. Elimination of possible sources of disturbances and external noise interferences during test-setup. Proper DAQ using LabVIEW and signal conditioning & filtering. Avoid ground loops and proper isolation of various instruments as well as earthing to prevent ESD.

Test setup for low level measurement signal was developed.

Current measurements as low as 1pA

Voltage measurements upto 100  V

Resistance measurements as high as 10G Ω

Use of faraday cage to eliminate high frequency disturbances, guard connection in triax cables.

Elimination of possible sources of disturbances and external noise interferences during test-setup.

Proper DAQ using LabVIEW and signal conditioning & filtering.

Avoid ground loops and proper isolation of various instruments as well as earthing to prevent ESD.

Front Panel of Nano-switch Test Software Setup to interface Semiconductor Parametric Analyzer, Function Generator, SMU, Lock-in Amplifier and Oscilloscope. Statistical data analysis and plotting of test results on-the-go for precise control of testing parameters. Proper record of time, location and chip details stored in the data file.

Setup to interface Semiconductor Parametric Analyzer, Function Generator, SMU, Lock-in Amplifier and Oscilloscope.

Statistical data analysis and plotting of test results on-the-go for precise control of testing parameters.

Proper record of time, location and chip details stored in the data file.

Moment of electrostatic actuator for MEMS Modeling

Dynamic Equation of Motion for Simulation - MEMS Switch

Fabrication of Electro-hydro dynamic Micropump of flexible parylene substrate for IC Fabrication coursework. The flexible substrate technology can be used for building future flexible TFT screens. Parylene-C is bio-compatible substance and can be used for biomedical devices. FLEXTRONICS & BIOMEDICAL DEVICE

Fabrication of Electro-hydro dynamic Micropump of flexible parylene substrate for IC Fabrication coursework.

The flexible substrate technology can be used for building future flexible TFT screens.

Parylene-C is bio-compatible substance and can be used for biomedical devices.

Device Integration and R&D