Purdue University Graduate School
Browse

File(s) under embargo

1

year(s)

1

month(s)

13

day(s)

until file(s) become available

AN ORGANIC NEURAL CIRCUIT: TOWARDS FLEXIBLE AND BIOCOMPATIBLE ORGANIC NEUROMORPHIC PROCESSING

thesis
posted on 2023-07-31, 13:55 authored by Mohammad Javad Mirshojaeian HosseiniMohammad Javad Mirshojaeian Hosseini

Neuromorphic computing endeavors to develop computational systems capable of emulating the brain’s capacity to execute intricate tasks concurrently and with remarkable energy efficiency. By utilizing new bioinspired computing architectures, these systems have the potential to revolutionize high-performance computing and enable local, low-energy computing for sensors and robots. Organic and soft materials are particularly attractive for neuromorphic computing as they offer biocompatibility, low-energy switching, and excellent tunability at a relatively low cost. Additionally, organic materials provide physical flexibility, large-area fabrication, and printability.

This doctoral dissertation showcases the research conducted in fabricating a comprehensive spiking organic neuron, which serves as the fundamental constituent of a circuit system for neuromorphic computing. The major contribution of this dissertation is the development of the organic, flexible neuron composed of spiking synapses and somas utilizing ultra-low voltage organic field-effect transistors (OFETs) for information processing. The synaptic and somatic circuits are implemented using physically flexible and biocompatible organic electronics necessary to realize the Polymer Neuromorphic Circuitry. An Axon-Hillock (AH) somatic circuit was fabricated and analyzed, followed by the adaptation of a log-domain integrator (LDI) synaptic circuit and the fabrication and analysis of a differential-pair integrator (DPI). Finally, a spiking organic neuron was formed by combining two LDI synaptic circuits and one AH synaptic circuit, and its characteristics were thoroughly examined. This is the first demonstration of the fabrication of an entire neuron using solid-state organic materials over a flexible substrate with integrated complementary OFETs and capacitors.

History

Degree Type

  • Doctor of Philosophy

Department

  • Engineering Technology

Campus location

  • West Lafayette

Advisor/Supervisor/Committee Chair

Robert A. Nawrocki

Additional Committee Member 2

Daniel Leon-Salas

Additional Committee Member 3

Brittany Newell

Additional Committee Member 4

Rahim Rahimi