Patent ID: 11934095
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method of managing a critical dimension error, the method comprising:
defining, in a photomask, N openings having a width corresponding to a target critical dimension, where N is a natural number;
by irradiating light to the photomask, using graphs for each of the N openings, each of the graphs being obtained by setting locations in and outside an opening of the N openings as a first axis and an intensity of transmitting light as a second axis perpendicular to the first axis, obtaining ILSi which is proportional to an inclination of a tangent to a graph of the graphs at a location corresponding to an edge of an opening and Ii which is an intensity of transmitting light at the location corresponding to the edge of the opening, where i is a natural number from 1 to N;
obtaining, with respect to each of the N openings, a real width CDi of the openings; and
when, I
    ave
   
   =
   
    
     1
     N
    
    ⁢
    
     
      ∑
       
     
     
      i
      =
      1
     
     N
    
    ⁢
    
     I
     i
    
   
  
  ,
  
   
    CD
    ave
   
   =
   
    
     1
     N
    
    ⁢
    
     
      ∑
       
     
     
      i
      =
      1
     
     N
    
    ⁢
    
     CD
     i
    
   
  
  ,
  
   
    and
    ⁢
       
    
     ILS
     ave
    
   
   =
   
    
     1
     N
    
    ⁢
    
     
      ∑
       
     
     
      i
      =
      1
     
     N
    
    ⁢
    
     ILS
     i
    
   
  
  ,, obtaining AIMEEFi which is an aerial image mask error enhancement factor with respect to each of the N openings according to an equation below:, AIMEEF
      i
     
     =
     
      
       -
       2
      
      ⁢
      
       
        
         
          I
          i
         
         -
         
          I
          ave
         
        
        
         
          (
          
           
            CD
            i
           
           -
           
            CD
            ave
           
          
          )
         
         ·
         
          ILS
          ave
         
         ·
         
          I
          ave
         
        
       
       .
      
     
    
   
   
    
     [
     Equation
     ]