Transient optical absorption of hole polarons in ADP (NH₄H₂PO₄) and KDP (KH₂PO₄) crystals

I. N. Ogorodnikov, V. Yu Yakovlev, B. V. Shul'gin, M. K. Satybaldieva

Division for Materials Science

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Abstract

A study of transient optical absorption of the ADP (NH₄H₂PO₄) and KDP (KH₂PO₄) nonlinear crystals in the visible and UV spectral regions is reported. Measurements made by absorption optical spectroscopy with nanosecond-time resolution established that the transient optical absorption (TOA) of these crystals originates from optical transitions in the hole A and B radicals and the optical-density relaxation kinetics is rate-controlled by interdefect tunneling recombination, which involves these hole centers and the electronic H⁰ centers representing neutral hydrogen atoms. At 290 K, hole polarons and the H⁰ centers undergo thermally stimulated migration, which is not accompanied by carrier ejection into the conduction or valence band. The slow components of the TOA kinetics with characteristic times from a few tens of milliseconds to a few seconds can be assigned to diffusion-controlled annihilation of hydrogen vacancies associated with impurity or structural defects.

Original language	English
Pages (from-to)	880-887
Number of pages	8
Journal	Physics of the Solid State
Volume	44
Issue number	5
DOIs	https://doi.org/10.1134/1.1477487
Publication status	Published - 1 May 2002

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ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

Ogorodnikov, I. N., Yakovlev, V. Y., Shul'gin, B. V., & Satybaldieva, M. K. (2002). Transient optical absorption of hole polarons in ADP (NH₄H₂PO₄) and KDP (KH₂PO₄) crystals. Physics of the Solid State, 44(5), 880-887. https://doi.org/10.1134/1.1477487

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AU - Satybaldieva, M. K.

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10.1134/1.1477487