Open AccessInvestigation of the evolution of free carriers during femtosecond laser-induced ultrafast amorphization in nitrogen doped Ge2Sb2Te5 films
Author(s) -
Y. H. Wang,
F. R. Liu
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1676/1/012113
Subject(s) - femtosecond , materials science , absorbance , doping , fluence , crystallization , ultrashort pulse , laser , absorption (acoustics) , analytical chemistry (journal) , optoelectronics , optics , chemistry , physics , organic chemistry , composite material , chromatography
The femtosecond laser-driven ultrafast evolution of free carriers during the phase-change process of N-doped Ge 2 Sb 2 Te 5 (N-GST) film was studied in this paper. And mechanism of initial absorption peak was calculated by two-temperature model. We found that the formation of Ge-N weaken the initial optical absorbance and decreased the concentration of free carriers, then improved the temperature of crystallization in N-GST. The doping(N) can reduce the grain size because of the easing of optical energy absorbance. At last, we inferred that, if the incident laser fluence is enough for phase transformation point, the transformation velocity of N-doped GST is faster than GST.