Plasma Chemistry Reactor: Understanding Non-Equilibrium Plasma Processes

What is a Plasma Chemistry Reactor

A plasma chemistry reactor is a device that uses non-thermal plasmas to ionize, dissociate, and excite gases. This process creates highly reactive species such as radicals and ions without significantly heating the surrounding environment, making it ideal for precise chemical reactions at room temperature.

In semiconductor manufacturing, these reactors are essential for etching processes where selective removal of materials is required with minimal damage to underlying layers.

Non-Equilibrium Plasma Processes

The key feature of a plasma chemistry reactor is the non-equilibrium state between electron temperature (Te) and gas temperature. Electrons, which are much lighter than gas molecules, can be rapidly heated to thousands of electronvolts by an applied electric field, while the gas remains at near-room-temperature.

This non-equilibrium condition allows for efficient ionization and dissociation of gases, leading to the formation of reactive species that drive chemical reactions.

Applications in Chemistry

Plasma chemistry reactors find applications in various fields including semiconductor manufacturing, where they are used for etching processes. They also play a crucial role in materials science, enabling the creation of advanced coatings and thin films.

In environmental technology, these reactors can be employed to break down harmful substances into less toxic compounds through oxidation reactions.

Principles Governing Plasma Chemistry

The behavior of a plasma chemistry reactor is governed by the principles of electrical discharge and chemical kinetics. The applied voltage creates an electric field that accelerates electrons, leading to collisions with gas molecules which can result in ionization, dissociation, and excitation.

These processes are described by equations such as the Townsend equation for breakdown, and rate laws for chemical reactions involving radicals and ions.

Frequently asked questions

Try it live

Everything above runs in your browser — open Plasma Chemistry Reactor and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.