Abstract
Abstract We have verified that the condition of negative electron affinity (NEA) exists on both single crystal cubic boron nitride (001)-(1×1) and polycrystalline cubic boron nitride (c-BN). The NEA condition has been linked to the presence of chemisorbed hydrogen on the surface. Annealing the c-BN to temperatures in excess of 1200 °C converts the surface to a positive electron affinity condition, which is believed to be due to the desorption of hydrogen from the surface. Subsequent exposure of the annealed surface to atomic hydrogen or cesium metal can regenerate the NEA condition.
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