Lead-acid battery in which the electrolyte is composed of a silica gel matrix.

Semiconductor material that is left intrinsic, or undoped so that the concentration of charge carriers is characteristic of the material itself rather than of added impurities.

A process in which a printer used precast pieces of type, representing letters and other symbols, which were inserted into a frame and used to print documents, books, etc.

A semiconductor produced by doping an intrinsic semiconductor with an electron-donor impurity (for example, phosphorus in silicon).

Silicon material that has been doped with a material that has more electrons in its atomic structure than silicon.

1. A semiconductor to which an impurity has been added so the concentration of electrons is much higher than the concentration of holes; the electrical current is carried chiefly by these electrons.
2. Negative semiconductor material in which there are more electrons than holes; current is carried through it by the flow of electrons.

A semiconductor in which holes carry the current; produced by doping an intrinsic semiconductor with an electron acceptor impurity; such as, boron in silicon.

Jamie was told that she had type-A blood, but it was a Type-O.