1、 IEC 62047-27 Edition 1.0 2017-01 INTERNATIONAL STANDARD Semiconductor devices Micro-electromechanical devices Part 27: Bond strength test for glass frit bonded structures using micro-chevron- tests (MCT) IEC 62047-27:2017-01(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 I
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11、al devices Part 27: Bond strength test for glass frit bonded structures using micro-chevron- tests (MCT) INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.080.99 ISBN 978-2-8322-3831-8 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publ
12、ication from an authorized distributor. colour inside 2 IEC 62047-27:2017 IEC 2017 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 7 3 Terms, definitions, symbols and abbreviated terms 7 3.1 Terms and definitions 7 3.2 Symbols and abbreviated terms 7 4 Principle 8 5 Test setu
13、p . 8 5.1 General . 8 5.2 Actuator 8 5.3 Force transducers . 8 5.4 Mounting . 8 5.5 Data acquisition 8 6 Specimens . 9 6.1 Sample design 9 6.2 Determination and verification of the specimen geometry 11 7 Conduction of the test 11 8 Test parameter 12 8.1 Test velocity . 12 8.2 Specimen alignment 13 8
14、.3 Environmental conditions 13 9 Analysis and evaluation . 13 9.1 General requirements for test series . 13 9.2 Valid test 13 9.3 Calculation of the fracture toughness of the glass frit connection 14 9.4 Statistical evaluation . 15 10 Test report . 15 Bibliography 16 Figure 1 Test setup of the micro
15、-chevron-test 6 Figure 2 Standard geometry design of glass frit specimen 10 Figure 3 Design of the load application elements . 11 Figure 4 Permissible deviation for stud application . 12 Figure 5 Connection of the free sample parts as a result of the application of the applied force initiation eleme
16、nts 12 Figure 6 Exemplary measurement graph of a valid attempt 14 Table 1 Geometry factors in relation to substrate thickness . 14 IEC 62047-27:2017 IEC 2017 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SEMICONDUCTOR DEVICES MICRO-ELECTROMECHANICAL DEVICES Part 27: Bond strength test for glass frit
17、 bonded structures using micro-chevron-tests (MCT) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation
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27、s publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62047-27 has been prepared by subcommittee 47F: M
28、icroelectromechanical systems, of IEC technical committee 47: Semiconductor devices. The text of this standard is based on the following documents: CDV Report on voting 47F/230A/CDV 47F/259/RVC Full information on the voting for the approval of this International Standard can be found in the report
29、on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 IEC 62047-27:2017 IEC 2017 A list of all parts in the IEC 62047 series, published under the general title Semiconductor devices Micro-electromechanical devices, can be found on
30、 the IEC website. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced b
31、y a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users sho
32、uld therefore print this document using a colour printer. IEC 62047-27:2017 IEC 2017 5 INTRODUCTION MEMS devices, e.g. for automotive applications, have to ensure lifecycles of up to 15 years or more. In order to guarantee functionality and reliability of the used interconnection technologies, quali
33、fied test methods are required for evaluating the quality and strength of the bonding interfaces. One of the preferred interconnection technologies for MEMS encapsulation is glass frit bonding, using an additional intermediate bond layer. The micro-chevron-test is an experimental method to determine
34、 the fracture toughness of brittle materials or bond interfaces using specifically designed test chips (micro-chevron- samples) under defined load conditions. It was established for characterizing the strength of wafer bonds without additional intermediate bond layers. By analysis of test results fr
35、om a series of tests at the Fraunhofer Institute for Mechanics of Materials and the Fraunhofer Institute for Electronic Nano Systems with different geometry and layout of the test-probes, the micro-chevron-test was established for the bonding reliability of glass frit bonded devices as well. 6 IEC 6
36、2047-27:2017 IEC 2017 SEMICONDUCTOR DEVICES MICRO-ELECTROMECHANICAL DEVICES Part 27: Bond strength test for glass frit bonded structures using micro-chevron-tests (MCT) 1 Scope This part of IEC 62047 specifies a method for assessing the bond strength of glass frit bonded structures using micro-chevr
37、on-tests (MCT). It describes suitable sample geometry and provides guidance for the design of deviating sample geometries. The micro-chevron-test is an experimental method to determine the fracture toughness K ICof brittle materials or bond interfaces using specifically designed test chips (micro-ch
38、evron- samples) under defined load conditions (crack opening mode I). Owing to its high precision and low variance, it is suitable for analysing the influence of different process parameters on bond strength as well as for quality assurance. The exemplary setup of the micro-chevron-test is given in
39、Figure 1. Key 1 upper glued stud for application of tensile force 2 micro-chevron-test sample with patterned glass-frit-interface 3 lower glued stud for application of tensile force F applied force Figure 1 Test setup of the micro-chevron-test IEC 3 2 1 F F x y z IEC 62047-27:2017 IEC 2017 7 These o
40、perational instructions are applicable for symmetrically glass frit bonded silicon- silicon-stacks, i.e. the joint upper and lower chip of the chevron sample exhibit identical thickness and mechanical properties. The method is suitable for test samples, which are either produced directly from indivi
41、dual chips in corresponding dimensions, or for integrated samples, which have been singled out from processed wafers using suitable methods. This document determines preferential dimensions for samples as well as parameters for the test conditions. Deviating geometries can potentially influence the
42、viability of the tests as well as the comparability of the results. On that score, all parameters are determined and documented accurately. 2 Normative references There are no normative references in this document. 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions No term
43、s and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.2 Symbols and abbreviated
44、terms Symbols Unit Descriptions A Bondmm 2effective bonding surface, represented by the area of the glass frit stripes A Chevronmm 2area of total chevron geometry a 0mm initial crack length a critmm critical crack length b mm sample width C Fbond area ratio t w1 ,t w2m wafer thickness 1-top wafer /
45、2-bottom wafer F maxN experimentally determined maximum force g smm width of glass frit bond stripes K ICMPa m 0,5fracture toughness of bonding interface l mm sample length v m/s testing velocity w smm distance between glass frit bond stripes Y mingeometry factor 8 IEC 62047-27:2017 IEC 2017 4 Princ
46、iple Strength measurement by means of micro-chevron-testing is based on a mode I crack opening within the bonding interlayer. Studs, applied to the surface of the chips, thus transfer a tensile load to the specimen in z-direction (see Figure 1). Special requirements are to be met when aligning speci
47、mens in the test setup in order to avoid additional shear stress within the bonding interface, and thus avoiding a mixed mode loading of the bond connection. The applied force F leads to an increase of the stress intensity factor K Iat the tip of the chevron geometry a 0 . If the stress intensity fa
48、ctor exceeds the fracture toughness, self- initiation of a defined crack with subsequent crack growth will start in this area. While the local stress intensity factor increases with growing crack length, the widening of the crack front decreases the stress intensity factor. As a consequence of these
49、 two counter- mechanisms, initially a quasi-stable crack propagation occurs in the brittle material. Hence, further crack growth up to the critical crack length a crit requires an increase of the introduced force up to the maximum value F max . As a result of the insetting instable crack propagation, the critical failure of the specimen occurs. The critical crack length a critis solely determined by the geometry of the used specimen and can be calculated using finite element ana
