Pulsed laser synthesis of titanium silicides using a Q-Switched Nd: Glass laser |
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Authors: | E D'Anna G Leggieri A Luches S Luby J Zemek |
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Institution: | (1) Dipartimento di Fisica, Universitá di Lecce, I-73100 Lecce, Italy;(2) Institute of Physics, EPRC, Slovak Academic Science, CS-84228 Bratislava, Czechoslovakia;(3) Institute of Physics, Czechoslovak Academic Science, CS-18040 Prague, Czechoslovakia |
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Abstract: | Titanium films 120 nm thick deposited on single-crystalline silicon (c-Si) as well as poly-Si/SiO2/c-Si substrates were subjected to Nd: glass laser irradiation. Laser fluences of 1,1.5, and 2 J/cm2 were used at the pulse duration of 30 ns. From RBS analysis it follows that on c-Si substrate titanium suicide is formed using one pulse of 1.5 J/cm2 energy density. On the substrate with surface overlayers lower fluence (1 J/cm2) was sufficient. Under these conditions the sheet resistance of the samples decreased from the initial value 5 / to 2–3 / . The smaller threshold density of energy for suicide formation in Ti/polySi/SiO2/c-Si structure is shown to be a consequence of the SiO2 underlayer, which is a poorer heat conductor than silicon. The experimental results of the suicide synthesis are in semi-quantitative accordance with the numerical computations of the temperature vs time evolution and depth temperature distribution in our samples. |
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Keywords: | 68 55 79 20D 82 50 |
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