A body of material is doped by applying a solution or dispersion of a doping agent, evaporating the solvent or dispersion medium, and subjecting the treated body to zone-melting in a crucible followed by crystal pulling. The doping agent may be dissolved or dispersed in admixture with material of the body. Silicon may be doped with aluminium, antimony, boron, or phosphorus; boron may be doped with silicon; and gallium arsenide may be doped with zinc. The liquid medium may be water, benzine, an alcohol, or an oil, and may contain a viscosity-increasing agent, e.g. glycerine, gelatine, or an oil. The medium may contain sodium hydroxide in the treatment of silicon. The body may have been roughened, e.g. by etching. The solution may be applied as discrete drops, as a continuous film, or as one or more stripes. A constant or varied resistivity may be produced. Examples are given.
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