Low-temperature deposition of zirconium and hafnium boride films by thermal decomposition of the metal borohydrides (M[BH4]4)

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Abstract
Conductive (150 μΩ cm), adherent films of zirconium and hafnium borides have been deposited on various substrates by the low‐temperature (100–270 °C) thermal decomposition of Zr[BH4]4 and Hf[BH4]4. Auger electron spectroscopy of these films shows that their composition is ZrB2 and HfB2. The film surfaces are oxidized and slightly carbon contaminated. However, the bulk contains less than 1 at. % C or O. This synthesis is by far the lowest temperature preparation of these materials (plasma‐enhanced chemical vapor deposition of TiB2 requires 480–600 °C) and holds great promise for the use of these materials in electronics applications.