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Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption

H. Okamura·M. Matsubara·K. Tanaka·K. Fukui·H. Nakagawa·Y. Ikemoto·T. Moriwaki·H. Kimura·T. Nanba
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Abstract

Infrared absorption spectra of SrTiO$_3$ have been measured under above-band-gap photoexcitations to study the properties of photogenerated carriers, which should play important roles in previously reported photoinduced phenomena in SrTiO$_3$. A broad absorption band appears over the entire mid-infrared region under photoexcitation. Detailed energy, temperature, and excitation power dependences of the photoinduced absorption are reported. This photo-induced absorption is attributed to the intragap excitations of the photogenerated carriers. The data show the existence of a high density of in-gap states for the photocarriers, which extends over a wide energy range starting from the conduction and valence band edges.

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H. Okamura, M. Matsubara, K. Tanaka, K. Fukui, H. Nakagawa, Y. Ikemoto, T. Moriwaki, H. Kimura, T. Nanba. 2005-10-31. Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption. https://doi.org/10.1143/jpsj.75.023703

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