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Doping of a pure silicon array. Silicon based intrinsic semiconductor becomes extrinsic when impurities such as boron and antimony are introduced.. In semiconductor production, doping is the intentional introduction of impurities into an intrinsic (undoped) semiconductor for the purpose of modulating its electrical, optical and structural properties.
Incidence of the use of performance-enhancing drugs ("doping") in football seems to be lower than in other sports. However, this could also be explained by the low amount of unannounced drug testing during training. There were also no further investigations or consequences in the Operación Puerto doping case or other revelations. [1]
The use of anabolic steroids and performance-enhancing drugs in American football is officially prohibited by virtually every sanctioning body. The National Football League (NFL) began to test players for steroid use during the 1987 season, and started to issue suspensions to players during the 1989 season. [ 1 ]
Technology doping is the practice of gaining a competitive advantage using sports equipment. The World Anti-Doping Agency (WADA) considers prohibiting technologies if they are "performance-enhancing" or "being against the spirit of the sport".
Modulation doping is a technique for fabricating semiconductors such that the free charge carriers are spatially separated from the donors. Because this eliminates scattering from the donors, modulation-doped semiconductors have very high carrier mobilities .
This process is known as doping, and the resulting semiconductors are known as doped or extrinsic semiconductors. Apart from doping, the conductivity of a semiconductor can be improved by increasing its temperature. This is contrary to the behavior of a metal, in which conductivity decreases with an increase in temperature. [4]
The addition of a dopant to a semiconductor, known as doping, has the effect of shifting the Fermi levels within the material. [ citation needed ] This results in a material with predominantly negative ( n-type ) or positive ( p-type ) charge carriers depending on the dopant variety.
A degenerate semiconductor is a semiconductor with such a high level of doping that the material starts to act more like a metal than a semiconductor. Unlike non-degenerate semiconductors, these kinds of semiconductor do not obey the law of mass action, which relates intrinsic carrier concentration with temperature and bandgap.