hw3chee - That makes a polished silicon wafer. 2. Describe...

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Homework #3 Introduction to Chemical Engineering 1. Describe the steps required to produce polished silicon wafers, starting with the raw material, SiO 2 . After oxide is placed on the wafer, the resist is put on. Then the reticule is put over the wafer, where light shines through parts of it to expose the certain pattern on the resist, which is photosensitive. The resist is further progressed, and the excess is cleaned off of the wafer. A dry etch eradicates the unprotected oxides, and then the residual resist is cleaned in wet etch to show the patterned layer of oxide. Then the wafer is washed.
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Unformatted text preview: That makes a polished silicon wafer. 2. Describe how small features (lines, holes, etc.) are made in integrated circuits. By using photolithography, one can use insulating layer to structure the circuit components. The photoresist toughens the wanted designs. Metallization is where the bonds are created on the integrated circuits. 3. Boron is a common dopant (impurity) in silicon. If a typical silicon wafer with a diameter of 300 mm and a thickness of 0.7 mm were to contain 1 x 10 17 boron atoms per cm 3 , how many grams of boron is in the wafer? 1.795 x 10 5 Grams of boron...
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