Thursday, March 22, 2012


  • A photoresist is a light-sensitive material used in several industrial processes, such as  photolithography and photoengraving to form a patterned coating on a surface.
  • Photoresists are classified into two groups: positive resists and negative resists.
  • A positive resist is a type of photoresist in which the portion of the photoresist that is exposed to light becomes soluble to the photoresist developer. The portion of the photoresist that is unexposed remains insoluble to the photoresist developer.
  • Positive resist has the advantages of high contrast, good step coverage, and high aspect ratios. 

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