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Related Concept Videos

Semiconductors01:22

Semiconductors

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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...
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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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Types of Semiconductors01:20

Types of Semiconductors

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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...
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Design Example: Resistive Touchscreen01:14

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
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Metal-Semiconductor Junctions

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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...
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Op-amp circuits have significant applications in various fields, including automotive engineering. One such application is cruise control systems in cars, where op-amp circuits are integral for maintaining a constant speed. In these systems, op-amps function as both integrators and differentiators.
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Two-dimensional devices and integration towards the silicon lines.

Shuiyuan Wang1, Xiaoxian Liu1, Mingsheng Xu2

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Two-dimensional materials offer a path beyond silicon limitations for advanced electronics. This study explores integrating these novel materials into silicon technology for next-generation circuits.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Physics

Background:

  • Complementary metal-oxide-semiconductor (CMOS) circuit advancements face limitations due to inherent silicon properties.
  • Two-dimensional (2D) materials are explored as potential replacements or complements to silicon due to their unique atomic structures and properties.

Purpose of the Study:

  • To bridge the gap between 2D materials and silicon technology for integrated circuits.
  • To discuss requirements for material synthesis, device design, and circuit integration of 2D materials on silicon platforms.

Main Methods:

  • Exploration of monolithic 'on-silicon' and 'with-silicon' circuit designs.
  • Analysis of material synthesis and device integration strategies for 2D materials on silicon.

Main Results:

  • Demonstration of potential pathways for incorporating 2D materials into silicon platforms.
  • Identification of key requirements for successful integration, including material synthesis and device design.

Conclusions:

  • 2D materials are crucial for overcoming silicon's limitations in semiconductor technology.
  • Integration strategies for 2D materials are essential for future mainstream electronic circuits.