Thermokinetic Study of Aluminum-Induced Crystallization of a-Si: The Effect of Al Layer Thickness

被引:4
作者
Zharkov, Sergey M. [1 ,2 ]
Yumashev, Vladimir V. [2 ,3 ]
Moiseenko, Evgeny T. [2 ]
Altunin, Roman R. [2 ]
Solovyov, Leonid A. [3 ]
Volochaev, Mikhail N. [1 ]
Zeer, Galina M. [2 ]
Nikolaeva, Nataliya S. [2 ]
Belousov, Oleg V. [2 ,3 ]
机构
[1] RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia
[2] Siberian Fed Univ, Lab Electron Microscopy, Krasnoyarsk 660041, Russia
[3] RAS, Inst Chem & Chem Technol, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia
基金
俄罗斯科学基金会;
关键词
amorphous silicon; Al/Si; nanolayer; multilayer film; metal-induced crystallization; aluminum-induced crystallization; kinetics; activation energy; enthalpy; simultaneous thermal analysis (STA); SOLID-STATE REACTIONS; STRUCTURAL PHASE-TRANSFORMATIONS; METAL-INDUCED CRYSTALLIZATION; AMORPHOUS-SILICON; THIN-FILMS; PROFILE REFINEMENT; KINETICS; ORIENTATION; DIFFRACTION; SURFACE;
D O I
10.3390/nano13222925
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The effect of the aluminum layer on the kinetics and mechanism of aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) in (Al/a-Si)n multilayered films was studied using a complex of in situ methods (simultaneous thermal analysis, transmission electron microscopy, electron diffraction, and four-point probe resistance measurement) and ex situ methods (X-ray diffraction and optical microscopy). An increase in the thickness of the aluminum layer from 10 to 80 nm was found to result in a decrease in the value of the apparent activation energy Ea of silicon crystallization from 137 to 117 kJ/mol (as estimated by the Kissinger method) as well as an increase in the crystallization heat from 12.3 to 16.0 kJ/(mol Si). The detailed kinetic analysis showed that the change in the thickness of an individual Al layer could lead to a qualitative change in the mechanism of aluminum-induced silicon crystallization: with the thickness of Al <= 20 nm. The process followed two parallel routes described by the n-th order reaction equation with autocatalysis (Cn-X) and the Avrami-Erofeev equation (An): with an increase in the thickness of Al >= 40 nm, the process occurred in two consecutive steps. The first one can be described by the n-th order reaction equation with autocatalysis (Cn-X), and the second one can be described by the n-th order reaction equation (Fn). The change in the mechanism of amorphous silicon crystallization was assumed to be due to the influence of the degree of Al defects at the initial state on the kinetics of the crystallization process.
引用
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页数:24
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