Vibrational spectroscopy of arsenic-hydrogen complexes in ZnSe

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Abstract
Using infrared absorption spectroscopy, we have observed hydrogen local vibrational modes (LVMs) in arsenic‐doped ZnSe grown by metalorganic chemical vapor deposition(MOCVD). When hydrogen is used as a carrier gas, we find an absorption peak at 2165.6 cm−1, which we attribute to a bond‐stretching mode of a hydrogen attached to an arsenic acceptor in a bond‐centered orientation. With deuterium substituting the hydrogen carrier gas, we find an additional peak at 1557.1 cm−1 with 1/3 the intensity of the hydrogen peak. The isotopic frequency ratio is r=v H/v D=1.3908, similar to values found in many hydrogen/deuterium‐related complexes. The larger area of the hydrogen peak indicates that most of the hydrogen comes from decomposition reactions involving the metalorganic molecules. The temperature dependent shift of the ZnSe:As,H mode is proportional to the lattice thermal energy U(T), a consequence of the anharmonic coupling between the LVMs and the lattice phonons.

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