A method to determine the Young's modulus of thin-film elements assisted by dark-field electron holography

作者：Reboh S^*; Benzo P; Morin P; Cours R; Hytch M J; Claverie A

来源：Applied Physics Letters, 2013, 102(5): 051911.

DOI：10.1063/1.4790617

We present a method to determine the isotropic elastic modulus of nanometer-thick films of unknown or imprecise microstructure and composition. First, the mesoscopic stress of the film is determined using Stoney's method. Then, after fabricating film-stripes by lithography, dark-field electron holography is used to image the strain fields (3 nm spatial resolution, similar to 2 x 10(-4) precision) resulting from the local interactions between the stripes and an underlying silicon crystal. By comparing the experimental results with finite element method modeling, we deduce Young's modulus of the film. Silicon nitride films on Si substrates are presented as a model system.

• 出版日期2013-2-4
• 单位中国地震局