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What role does hexamethyldisilazane play in semiconductor lithography?

May 6,2026

Hexamethyldisilazane (HMDS) is a volatile, water-sensitive, and slightly ammonia-smelling organosilane reagent that primarily functions as a adhesion promoter in photolithography. It undergoes a silanization reaction with the hydroxyl groups on the silicon wafer surface, forming a dense, hydrophobic trimethylsilane monolayer. This layer alters the hydrophilic properties of the wafer surface, significantly reducing surface polarity and effectively enhancing the adhesion between the photoresist and the silicon substrate. HMDS can prevent defects such as photoresist edge lifting, peeling, and warping during subsequent development and etching processes, improving the integrity of the lithographic pattern and the process yield. It is commonly used in the pre-treatment stage before photolithography, either through vapor-phase fumigation or liquid-phase coating.

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