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Hot metal wires as sinks and sources of B atoms

Publication date: 1 August 2017
Source:Thin Solid Films, Volume 635
Author(s): Hironobu Umemoto, Atsushi Miyata
Metal wires, such as W, Mo, and Ta, can be boronized to become sinks of B atoms by heating them in the presence of a mixture of H2 and H3NBH3 or (BH)3(NH)3. These boronized wires behave as sources of B atoms when heated in vacuum. The density of B atoms released to the gas phase increases with the addition of H2 and can be >1011 cm3, which is enough for surface doping. The release is stable and continues for more than several hours when boronized for 1h. Since the metal wires are not nitrided, contamination by N atoms is not expected. H3NBH3 and (BH)3(NH)3 are not explosive, and wires boronized by these species can be used as safe and contamination-free sources of B atoms for surface doping.


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