negative electron-affinity material

negative electron-affinity material

[′neg·əd·iv i′lek‚trän ə′fin·əd·ē mə‚tir·ē·əl]
(electronics)
A material, such as gallium phosphide, whose surface has been treated with a substance, such as cesium, so that the surface barrier is reduced, band-bending occurs so that the top of the conduction band lies above the vacuum level, and the electron affinity of the substance in negative. Abbreviated NEA material.
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