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Related Concept Videos

Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Understanding Memory01:19

Understanding Memory

Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
System of Memory01:23

System of Memory

Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...

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Related Experiment Video

Updated: Jun 13, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 12, 2013

A polymer/semiconductor write-once read-many-times memory.

Sven Möller1, Craig Perlov, Warren Jackson

  • 1Department of Electrical Engineering and Center for Photonics and Optoelectronic Materials, Princeton University, Princeton, New Jersey 08544, USA.

Nature
|November 14, 2003
PubMed
Summary
This summary is machine-generated.

Researchers developed a new organic electronic memory using electrochromic polymers and silicon diodes. This write-once read-many-times (WORM) memory offers a low-cost, reliable solution for large-scale data storage.

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Last Updated: Jun 13, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

Published on: March 9, 2019

Area of Science:

  • Materials Science
  • Organic Electronics
  • Solid-State Physics

Background:

  • Organic electronic devices offer low-cost, lightweight, and ubiquitous computing solutions.
  • Organic electronic memory components have been underexplored despite their potential.

Purpose of the Study:

  • To develop a novel architecture for a write-once read-many-times (WORM) organic electronic memory.
  • To explore the hybrid integration of organic and inorganic materials for data storage applications.

Main Methods:

  • Hybrid integration of an electrochromic polymer with a thin-film silicon diode.
  • Deposition onto a flexible metal foil substrate.
  • Utilizing a current-controlled, thermally activated un-doping mechanism in a two-component electrochromic conducting polymer.

Main Results:

  • Demonstrated a reliable hybrid organic/inorganic WORM memory device.
  • Achieved rapid, large-scale archival data storage capabilities.
  • The memory pixel performance is based on polymer un-doping.

Conclusions:

  • The developed WORM memory architecture is a viable method for ultralow-cost permanent data storage.
  • This technology can potentially replace conventional bulky and expensive data storage solutions.
  • The hybrid approach offers a reliable pathway for advanced organic electronic memory devices.