The working principle of carbon tetrafluoride (CF₄) primarily involves a chemical reaction process within a plasma environment. In semiconductor, photovoltaic, and other electronic manufacturing processes, CF₄ is introduced into a vacuum reaction chamber and ionizes and dissociates under a radio frequency electric field, forming fluorine-containing active particles such as fluorine radicals (F·) and other fluorine ions. These active particles possess high reactivity and can chemically react with substances like silicon and silica on the material surface.

During plasma etching, CF₄ molecules are excited by energy, causing the C-F chemical bonds to break, releasing fluorine elements that participate in the etching reaction. Taking silicon etching as an example, active fluorine atoms can react with silicon to generate volatile silicon fluoride compounds (such as SiF₄), which are then removed through a vacuum system, thus achieving the removal of the material layer. This process is characterized by strong directionality and high processing precision, making it suitable for the fine structure fabrication of microelectronic devices.

In production applications, the etching effect of CF₄ depends not only on the gas itself but also on process parameters such as radio frequency power, chamber pressure, gas flow rate, temperature, and the ratio of mixed gases. By adjusting these conditions, plasma density, active particle concentration, and etching rate can be controlled to meet the requirements of different materials and manufacturing processes. Therefore, electronic-grade CF₄ typically needs to possess high purity and low impurity content to ensure process stability.

Carbon tetrafluoride (CF₄) can also be used in the cleaning process of some equipment chambers. Utilizing the fluorinated active species generated by plasma, silicon-containing films or residues deposited inside equipment can be removed, restoring the equipment to a clean state and improving production continuity. Due to its stable molecular structure and good process adaptability, CF₄ has become one of the important electronic specialty gases in the semiconductor, photovoltaic, and display panel manufacturing fields.