The photoinduced insulator-metal phase transition and relaxation characteristics have been investigated in bare SrTiO3 single crystals. The photoinduced relaxation time constant after the irradiation shows an increase with increasing temperatures. The SrTiO3 single crystal has a cutoff wavelength and an absorption edge of spectrum at about 385 nm, which agrees well with the band gap. The photocurrent responsivity is 1.36 × 10-5 A/W at 300 nm wavelength. The relative change in resistance is more than above six orders at room temperature, possessing potential applications in ultraviolet sensitive and detecting devices.
Bibliographical noteFunding Information:
The authors thank the supports from the National Research Foundation of Singapore (CRP4-2008-04), National Natural Science Foundation of China (Nos. 61078057, 51202195, and 51172183), and NPU Foundation for Fundamental Research (Nos. JC20120246 and JC20110273).
ASJC Scopus subject areas
- General Physics and Astronomy