Construct · 3 fields · 4 citations
One name. Different field. Different construct. One map.
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The deliberate introduction of a small, controlled number of foreign atoms into an otherwise pure semiconductor crystal such as silicon, in order to fix its electrical behaviour: adding atoms with one extra valence electron (like phosphorus) leaves mobile negative carriers (n-type), while adding atoms with one fewer (like boron) leaves mobile positive holes (p-type). Pearson and Bardeen's 1949 Electrical Properties of Pure Silicon and Silicon Alloys Containing Boron and Phosphorus measured how tiny amounts of these added atoms set silicon's conductivity, groundwork for the transistor and all later electronics. The referent is a change made to a solid crystal to control how it conducts, not a banned drug taken by an athlete or a chemical treatment that turns a plastic into a conductor.[1]
The use by athletes of prohibited substances or methods to gain an unfair edge in performance, together with the rules and tests built to stop it: blood doping, for example, raises the blood's oxygen-carrying capacity by transfusion or by injecting erythropoietin (EPO), which increases red-cell mass. Ekblom and Berglund's 1991 Effect of erythropoietin administration on maximal aerobic power showed experimentally that EPO lifts endurance capacity, a finding at the centre of later anti-doping science reviewed by Breenfeldt Andersen and colleagues in 2024. The referent is a banned practice in competitive sport and the framework that polices it, not an impurity added to a crystal or a chemical treatment of a polymer.[2][3]
In the chemistry of conjugated polymers, a redox treatment that adds or removes electrons from a carbon-based polymer, turning an insulating plastic into an electrical conductor by creating mobile charges along its backbone: exposing polyacetylene to an oxidising agent such as iodine can raise its conductivity by many orders of magnitude. Shirakawa, Louis, MacDiarmid, Chiang, and Heeger's 1977 Synthesis of electrically conducting organic polymers reported this effect, work that won the 2000 Nobel Prize in Chemistry. Although it borrows the word from crystal doping by loose analogy, the mechanism differs: here whole electrons are added to or pulled from the molecule in large proportions, rather than a few substitutional atoms fixing a crystal's carriers, and it has nothing to do with drugs in sport.[4]
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