Silicon principal characteristics

The principal purpose of these experiments is to demonstrate that extremely sharp thresholds in optical transmittance can be obtained from laser photobleaching of a copolymerized absorber. It is not clear that these results can be applied directly to wafer processing conditions. Since the thermal characteristics of the sample are probably quite important in our experiments, the results obtained from a single polymer film on fused silica may not be the same as those found with a multilayer film on silicon. Clearly considerable additional experimentation is necessary before one can consider practical applications. 

Silicon etching in KOH solutions have been extensively investigated, resulting in a body of information that shapes the current understanding of the etching behavior of silicon in alkaline solutions. The major characteristics and the principal reaction processes involved in all alkaline solutions appear to be similar to that in the KOH system although the detailed characteristics vary from system to system. Most notably,... 

Metalloids have properties intermediate between those of metals and nonmetals. They may have some characteristic metallic properties, but lack others. For example, silicon looks like a metal (Figure 7.18 ), but it is brittle rather flian malleable and is a much poorer conductor of heat and electricity titan are metals. Several of the metalloids, most notably silicon, are electrical semiconductors and are the principal elements used in the manufacture of integrated circuits and computer chips. 

The characteristics of silicon depend on the principal planes (see Table 10.2). The (100) plane is the weakest plane and easiest to work with. The (110) plane offers the cleanest surface for microfabrication. The (111) plane is the strongest plane and toughest to work with. 

Replacement materials may need to be generated [13]. In the case of PCB, the need for stability, fire resistance, and good electrical characteristics has restricted the search to compounds that may still have the same properties of persistence and bioaccumulation, that led to the concern about PCB in the first place principal contenders are alkylated biphenyls and terphenyls, silicones, phosphate esters and high molecular weight phthalates. 

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