Classifier Instance:

Anchor text: Multijunction photovoltaic cell
Target Entity: Multijunction_photovoltaic_cell
Preceding Context: Gallium is used as a dopant for the production of solid-state devices such as transistors. However, worldwide the actual quantity used for this purpose is minute, since dopant levels are usually of the order of a few parts per million.
Succeeding Context: s, developed for satellite power applications, are made by molecular beam epitaxy or metalorganic vapour phase epitaxy of thin films of gallium arsenide, indium gallium phosphide or indium gallium arsenide.The Mars Exploration Rovers and several satellites use triple junction gallium arsenide on germanium cells. Gallium is also a component in photovoltaic compounds (such as copper indium gallium selenium sulfide or Cu(In,Ga)(Se,S) 2 ) for use in solar panels as a cost-efficient alternative to crystalline silicon.
Paragraph Title: Semiconductors
Source Page: Gallium

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