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arxiv:1802.01472

Coefficient of Thermal Expansion Balancing for Field Assisted Bonding of Silicon to Glass

Published on Jan 4, 2018
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Abstract

An analytical thin-film stress model using integrated thermal expansion differences determines optimal anodic bonding temperatures for silicon and glass to minimize residual stresses.

Stresses caused by thermal expansion coefficients mismatch of anodically bonded glass and silicon samples are studied. An analytical model to determine graphically the optimum bonding temperature is presented. It is essentially a model for thin-film stress but uses integration of the linear coefficient of thermal expansion difference between the bonding temperature and the working temperature. Recommendations for choosing the bonding temperature of silicon to two brands of glass (Corning 7740 and LK5) are made. Keywords: anodic bonding, field assisted bonding, thermal expansion, stress.

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