Modeling two-dimensional diffusion-controlled wet chemical etching using a total concentration approach

P. Rath, J. C. Chai, H. Zheng, Y. C. Lam, V. M. Murukeshan

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A total concentration fixed-grid approach analogous to the enthalpy method for melting/solidification is presented in this article to model two-dimensional diffusion-controlled wet chemical etching. A total concentration, which is the sum of the unreacted and the reacted concentrations is defined. Using this newly defined total concentration, the governing equation also contains the interface condition. For demonstration purposes, the finite-volume method is used to solve the resulting set of governing equation, initial condition and boundary conditions. The results obtained using the total concentration method are compared with solutions from the asymptotic solution and the finite element method. The effects of mask thickness and initial concentration on evolution of etchfront during etching are examined. High initial etchant concentration leads to faster etching and hence the speed of etchfront. It is seen that when mask thickness increases, the bulging effect near the mask corner is less pronounced.

LanguageEnglish
Pages1480-1488
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume49
Issue number7-8
Early online date22 Nov 2005
DOIs
Publication statusPublished - Apr 2006
Externally publishedYes

Fingerprint

Wet etching
Masks
etching
Etching
Finite volume method
masks
Solidification
Enthalpy
Melting
Demonstrations
Boundary conditions
Finite element method
bulging
etchants
finite volume method
two dimensional models
solidification
finite element method
enthalpy
grids

Cite this

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Modeling two-dimensional diffusion-controlled wet chemical etching using a total concentration approach. / Rath, P.; Chai, J. C.; Zheng, H.; Lam, Y. C.; Murukeshan, V. M.

In: International Journal of Heat and Mass Transfer, Vol. 49, No. 7-8, 04.2006, p. 1480-1488.

Research output: Contribution to journalArticle

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