Why is UV light used for photolithography?
The UV lamp is used to expose photoresist, which is a photosensitive chemical, to imprint a microfluidic design in order to create a mold for chip replication or microfluidic chip itself.
What are photoresists used for?
A photoresist (also known simply as a resist) is a light-sensitive material used in several processes, such as photolithography and photoengraving, to form a patterned coating on a surface. This process is crucial in the electronic industry.
What is resist in lithography?
Resists are generally proprietary mixtures of a polymer or its precursor and other small molecules (e.g. photoacid generators) that have been specially formulated for a given lithography technology. Resists used during photolithography are called photoresists.
How are photolithography masks made?
Photomasks are made by applying photoresist to a quartz substrate with chrome plating on one side and exposing it using a laser or an electron beam in a process called maskless lithography.
What chemicals are in photoresist?
Photoresists are essentially hydrocarbon polymers composed of a novol-ack resin, a photoactive compound and an organic solvent.
What is mask blank?
Mask Blanks are the products which are formed from a chrome or molybdenum silicide based thin film on mainly quartz or soda-lime glass substrate. And they are coated by photosensitive resist materials which sensitive for electron or laser beam and resist for etching process to make circuit patterns.
What does a photomask look like?
A photomask is a fused silica (quartz) plate, typically 6 inches (~152mm) square, covered with a pattern of opaque, transparent, and phase-shifting areas that are projected onto wafers in the lithography process to define the layout of one layer of an integrated circuit.
What are the three major components of a photoresist?
The conventional positive photoresist has three major components: a photosensitive component called the photoactive compound (PAC), a novolak resin to provide structural stability and etch resistance, and a solvent which puts the solid photoresist into liquid form for the purpose of coating a substrate.
What is lithography in VLSI?
Lithography is the process of transferring patterns of geometric shapes in a mask to a thin layer of radiation-sensitive material (called resist) covering the surface of a semiconductor wafer.