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Nature of iron in InP: an FTIR study

Fe is still the commonly used dopant to fabricate semi- insulting (SI) InP, a key material for high-speed electronic and optoelectronic devices. High resolved absorption spectra of the internal d-d shell transitions at Fe2+ in InP and the related phonon sidebands and a series of iron related absorption lines are presented. Detailed infrared absorption study of the characteristic spectra of four zero-phonon lines (ZPLs), which are attributed to transitions within the 5D ground state of Fe2+ (3d6) on the indium site in a tetrahedral crystal field of phosphorus atoms and their temperature effects are given.