Light-induced relaxation dynamics in Rh-doped Bi12TiO20 crystals

18th International School on Condensed Matter Physics: "Challenges of Nanoscale Science: Theory, Materials, Applications"

Marinova, V.^1 ; Vlaikova, E.^2 ; Goovaerts, E.^3

Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Sofia

1113, Bulgaria^1

Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia

1764, Bulgaria^2

Experimental Condensed Matter Physics, Department of Physics, University of Antwerpen, Universiteitsplein, Antwerpen

B-2610, Belgium^3

关键词: Bi12TiO20 crystal;    Charge transport and recombination;    Double exponential;    Experimental curves;    Frequency-doubled Nd:YAG laser;    Photoinduced absorption;    Relaxation dynamics;    Trapping centers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/558/1/012031/pdf
DOI  :  10.1088/1742-6596/558/1/012031

来源: IOP

【 摘 要 】

The lifetime of the excited charge carriers in Rh-doped BTO crystals is characterized by measuring the time-resolved photoinduced absorption (PIA) after nanosecond pulse excitation from a frequency doubled Nd:YAG laser (λ=532 nm). It was found that the Rh-addition in the BTO structure slows down the relaxation decay in comparison with non- doped BTO, which is attributed to additional trapping centers related to the rhodium dopant. The experimental curve is well fitted by a double-exponential decay which is ascribed to the presence of two different shallow traps contributing to the charge transport and recombination mechanisms in Rh-doped BTO crystal.