Resume

• 1982

  University of Manitoba

  Professor

  PhD

  Electrical Engineering

• 1980

  MSc

  Electrical Engineering

• Conducting polymer hybrid systems such as PPy(Li+ DBS-) exhibit novel time- and potential-dependent conductivities that can be used to create dynamic memory. The bulk-dominated electronic behavior of conducting polymer hybrids is expected to have superior scaling properties to interface-dominated devices such as CMOS transistors or storage capacitors. In this letter

  the scaling properties of the potential-dependent current transients in electrochemically deposited PPy(Li+DBS-) coplanar junctions are examined from 5 to 45 μm. Static and dynamic electronic device behavior leads to the conclusion that carrier conduction in these systems is highly anisotropic with ratios in the range of 50-150:1.

  Scaling and Anisotropic Conduction in Electrochemically Deposited Polypyrrole Hybrid Junctions

  G M Aminur Rahman

  Dynamic resistive memory devices based on a conjugated polymer composite (PPy0DBS − Li + (PPy: polypyrrole; DBS − : dodecylbenzenesulfonate))

  with field-driven ion migration

  have been demonstrated. In this work the dynamics of these systems has been investigated and it has been concluded that increasing the applied field can dramatically increase the rate at which information can be 'written' into these devices. A conductance model using space charge limited current coupled with an electric field induced ion reconfiguration has been successfully utilized to interpret the experimentally observed transient conducting behaviors. The memory devices use the rising and falling transient current states for the storage of digital states. The magnitude of these transient currents is controlled by the magnitude and width of the write/read pulse. For the 500 nm length devices used in this work an increase in 'write' potential from 2.5 to 5.5 V decreased the time required to create a transient conductance state that can be converted into the digital signal by 50 times. This work suggests that the scaling of these devices will be favorable and that 'write' times for the conjugated polymer composite memory devices will decrease rapidly as ion driving fields increase with decreasing device size.

  Field enhanced charge carrier reconfiguration in electronic and ionic coupled dynamic polymer resistive memory

  thomson