Unformatted text preview: 2. The surface of a Si wafer is a (100) plane (a) Sketch the placement of Si atoms on the surface of the wafer? (b) Determine the number of atoms per cm 2 at the surface of the wafer. (c) Repeat parts (a) and this time taking the surface of the Si wafer to be a (110) plane. (d) Repeat parts (b) and this time taking the surface of the Si wafer to be a (110) plane. 3. Treating atoms as rigid spheres with radii equal to one-half the distance between nearest neighbors, show that the ratio of the volume occupied by the atoms to the total available volume in the various crystal structure is (a) π /6 or 52% for the simple cubic lattice. (b) 3 π /8 or 68% for the body centered cubic lattice. (c) 2 π /6 or 74% for the face centered cubic lattice. (d) 3 π /16 or 34% for the diamond lattice....
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- Spring '08
- Cubic crystal system, Diamond cubic, Crystal system, Atomic packing factor, simple cubic lattice