This new-found knowledge may then be used by engineers to create new tools and machines, such as semiconductors, computers, and other forms of advanced technology.
Holes in this sea indeed occur, and are extremely important for understanding the effects of semiconductors, though they are never referred to as positrons.
Surface reaction of organic compounds or metalorganics and hydrides containing the required chemical elements creates conditions for crystalline growth - epitaxy of materials and compound semiconductors.
