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Half wave rectifier

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.

Full wave rectifier

Full wave rectifier

A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.

Bridge rectifier

Bridge rectifier

The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...

Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

Voltage Doubler Circuit

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

Diode: Reverse bias

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...

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Related Experiment Video

Updated: Jun 27, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

A single molecule rectifier with strong push-pull coupling.

Aldilene Saraiva-Souza¹, Fabricio Macedo de Souza, Vicente F P Aleixo

¹Departamento de Física, Universidade Federal do Ceará, Ceará, Brazil.

The Journal of Chemical Physics

|December 3, 2008

Summary

This study explores electronic charge transport in molecular systems. For longer carbon bridges, electron localization creates conduction channels, enabling molecular rectification under electric fields.

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Area of Science:

Molecular electronics
Quantum chemistry
Charge transport phenomena

Background:

Understanding charge transport in molecular systems is crucial for developing novel electronic devices.
Molecular systems with donor-acceptor groups coupled by conjugated bridges offer tunable electronic properties.

Purpose of the Study:

To theoretically investigate electronic charge transport in a donor-acceptor molecular system.
To analyze the effect of bridge length on electron state distribution and conduction.
To evaluate the rectification behavior and propose a theoretical model.

Main Methods:

Ab initio calculations using Hartree-Fock approximations to determine electron state distribution.
Analysis of frontier molecular orbitals and their localization.
Calculation of rectification behavior based on charge accumulation.
Development of a phenomenological model using nonequilibrium Green's function.

Main Results:

Homogeneous distribution of frontier molecular orbitals for short bridges (n=0-3).
Strong localization of the lowest unoccupied molecular orbital for longer bridges (n>3).
Localized orbitals act as conduction channels under an external electric field.
Demonstrated rectification behavior in the molecular system.

Conclusions:

Bridge length significantly influences electron localization and charge transport pathways.
Localized orbitals facilitate efficient charge transport and rectification.
The proposed model provides a framework for understanding charge transport in such molecular systems.