Diethyldimethylammonium hydroxide solution is widely used in the semiconductor industry as a developer for photoresist materials. It plays a critical role in the photolithography process, where it helps to create precise patterns on silicon wafers by selectively removing exposed areas of the photoresist. This enables the fabrication of microelectronic components with high accuracy and miniaturization.

In addition, this solution is employed in organic synthesis as a strong base catalyst. It facilitates various chemical reactions, including alkylation and condensation processes, due to its high alkalinity and stability. Its effectiveness in promoting reactions makes it valuable in the production of pharmaceuticals, agrochemicals, and specialty chemicals.

Furthermore, it is utilized in the preparation of quaternary ammonium compounds, which are essential in industries such as surfactants, disinfectants, and fabric softeners. Its ability to act as a phase transfer catalyst also enhances the efficiency of reactions in heterogeneous systems.