Effect of ultraviolet curing wavelength on low-k dielectric material properties and plasma damage resistance

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
Název česky Vliv vlnove delky ultrafialove kury na materialove vlastnosti low-k dielektrik a odolnost proti poskozeni plazmatem
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MARŠÍK Přemysl URBANOWICZ A. M. VERDONCK P. DE ROEST D. SPREY H. BAKLANOV M. R.

Rok publikování 2011
Druh Článek v odborném periodiku
Časopis / Zdroj Thin Solid Films
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1016/j.tsf.2011.01.339
Obor Fyzika pevných látek a magnetismus
Klíčová slova Ellipsometry; Optical properties; Low-k dielectrics; Porosity; Porogen residues; Plasma damage
Popis A set of SiCOH low dielectric constant films (low-k) has been deposited by plasma enhanced chemical vapor deposition using variable flow rates of the porogen (sacrificial phase) and matrix precursors. During the deposition, two different substrate temperatures and radio frequency power settings were applied. Next, the deposited films were cured by the UV assisted annealing (UV-cure) using two industrial UV light sources: a monochromatic UV source with intensity maximum at gimel = 172 nm (lamp A) and a broadband UV source with intensity spectrum distributed below 200 nm (lamp B). This set of various low-k films has been additionally exposed to NH3 plasma (used for the CuOx reduction during Cu/low-k integration) in order to evaluate the effect of the film preparation conditions on the plasma damage resistance of low-k material. Results show that the choice of the UV-curing light source has significant impact on the chemical composition of the low-k material and modifies the porogen removal efficiency and subsequently the material porosity. The 172 nm photons from lamp A induce greater changes to most of the evaluated properties, particularly causing undesired removal of Si-CH3 groups and their replacement with Si-H. The softer broadband radiation from lamp B improves the porogen removal efficiency, leaving less porogen residues detected by spectroscopic ellipsometry in UV range. Furthermore, it was found that the degree of bulk hydrophilization (plasma damage) after NH3 plasma exposure is driven mainly by the film porosity.
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