Tight-Binding Quantum Chemical Molecular Dynamics Simulations of Mechanisms of SiO2 Etching Processes for CF2 and CF3 Radicals
Tight-Binding Quantum Chemical Molecular Dynamics Simulations of Mechanisms of SiO2 Etching Processes for CF2 and CF3 Radicals
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CF2 和 CF3 自由基的 SiO2 蚀刻过程机理的紧束缚量子化学分子动力学模拟
DOI:
10.1021/jp5015252
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Momoji Kubo
中科院分区:
文献类型:
--
作者:
Hiroshi Ito;Takuya Kuwahara;Kentaro Kawaguchi;Yuji Higuchi;Nobuki Ozawa;Seiji Samukawa;Momoji Kubo
The plasma etching of SiO2by CF2and CF3radicals is investigated by using our etching simulator based on tight-binding quantum chemical molecular dynamics method. During etching simulations, C–F and Si–O bonds dissociate and C–O and Si–F bonds are generated. Moreover, CO, CO2, COF, and COF2molecules form, which is consistent with previous experimental studies. We also examine the dependence of the etching mechanism of CF2and CF3radicals on the kinetic energy of irradiation. At a low kinetic energy of 10 eV, a CF2radical dissociates more Si–O bonds than a CF3radical does. This is because the high chemical reactivity of the CF2diradical accelerates the etching process. At a high kinetic energy of 150 eV, a CF3radical dissociates more Si–O bonds than a CF2radical does. This is because a CF3radical generates a greater number of reactive F atoms than a CF2radical does and thus forms more Si–F bonds. Thus, we conclude that our etching simulator modeled the different SiO2etching mechanisms of CF2and CF3radicals, which arose from the different chemical reactivities of radicals and F atoms at different kinetic energies. This is the first quantum chemistry study to model complicated chemical reactions, which are induced by the attack of many radical species, and clarify the different SiO2etching mechanisms for CF2and CF3radicals.
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DOI:
10.1116/1.2138718
发表时间:
2006
期刊:
影响因子:
--
作者:
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DOI:
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影响因子:
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DOI:
10.1143/jjap.46.7870
发表时间:
2007-12-01
期刊:
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
影响因子:
--
作者:
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