公开(公告)号：US07439170B1

公开(公告)日：2008-10-21

申请号：US12044692

申请日：2008-03-07

申请人： Timothy Harrison Daubenspeck ,  Wolfgang Sauter ,  Jeffrey P. Gambino ,  David L. Questad

发明人： Timothy Harrison Daubenspeck ,  Wolfgang Sauter ,  Jeffrey P. Gambino ,  David L. Questad

IPC分类号： H01L21/44

CPC分类号： H01L24/05 ,  H01L23/3171 ,  H01L23/5226 ,  H01L23/53214 ,  H01L23/53228 ,  H01L23/562 ,  H01L24/03 ,  H01L24/13 ,  H01L2224/02125 ,  H01L2224/0401 ,  H01L2224/05005 ,  H01L2224/05008 ,  H01L2224/05022 ,  H01L2224/05082 ,  H01L2224/05096 ,  H01L2224/05124 ,  H01L2224/05147 ,  H01L2224/05556 ,  H01L2224/05558 ,  H01L2224/05567 ,  H01L2224/05572 ,  H01L2224/05582 ,  H01L2224/05655 ,  H01L2224/13007 ,  H01L2224/13022 ,  H01L2224/13027 ,  H01L2224/131 ,  H01L2224/13111 ,  H01L2924/0002 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/01014 ,  H01L2924/01028 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/14 ,  H01L2924/1433 ,  H01L2924/15787 ,  H01L2924/351 ,  H01L2924/00014 ,  H01L2924/01047 ,  H01L2224/05552 ,  H01L2924/00

摘要： A design structure to provide a package for a semiconductor chip that minimizes the stresses and strains that arise from differential thermal expansion in chip to substrate or chip to card interconnections. An improved set of design structure vias above the final copper metallization level that mitigate shocks during semiconductor assembly and testing. Other embodiments include design structures having varying micro-mechanical support structures that further minimize stress and strain in the semiconductor package.

摘要翻译： 提供用于半导体芯片的封装的设计结构，其使从芯片到衬底或芯片到卡互连的差分热膨胀产生的应力和应变最小化。 在最终铜金属化水平之上的一组改进的设计结构通孔，可减轻半导体组装和测试期间的冲击。 其他实施例包括具有变化的微机械支撑结构的设计结构，其进一步最小化半导体封装中的应力和应变。

公开(公告)号：US07545050B1

公开(公告)日：2009-06-09

申请号：US12183369

申请日：2008-07-31

申请人： Timothy Harrison Daubenspeck ,  Wolfgang Sauter ,  Jeffrey P. Gambino ,  David L. Questad

发明人： Timothy Harrison Daubenspeck ,  Wolfgang Sauter ,  Jeffrey P. Gambino ,  David L. Questad

IPC分类号： H01L23/48

CPC分类号： H01L24/05 ,  H01L23/3171 ,  H01L23/5226 ,  H01L23/53214 ,  H01L23/53228 ,  H01L23/562 ,  H01L24/03 ,  H01L24/13 ,  H01L2224/02125 ,  H01L2224/0401 ,  H01L2224/05005 ,  H01L2224/05008 ,  H01L2224/05022 ,  H01L2224/05082 ,  H01L2224/05096 ,  H01L2224/05124 ,  H01L2224/05147 ,  H01L2224/05556 ,  H01L2224/05558 ,  H01L2224/05567 ,  H01L2224/05572 ,  H01L2224/05582 ,  H01L2224/05655 ,  H01L2224/13007 ,  H01L2224/13022 ,  H01L2224/13027 ,  H01L2224/131 ,  H01L2224/13111 ,  H01L2924/0002 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/01014 ,  H01L2924/01028 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/14 ,  H01L2924/1433 ,  H01L2924/15787 ,  H01L2924/351 ,  H01L2924/00014 ,  H01L2924/01047 ,  H01L2224/05552 ,  H01L2924/00

摘要： A design structure to provide a package for a semiconductor chip that minimizes the stresses and strains that arise from differential thermal expansion in chip to substrate or chip to card interconnections. An improved set of design structure vias above the final copper metallization level that mitigate shocks during semiconductor assembly and testing. Other embodiments include design structures having varying micro-mechanical support structures that further minimize stress and strain in the semiconductor package.

摘要翻译： 提供用于半导体芯片的封装的设计结构，其使从芯片到衬底或芯片到卡互连的差分热膨胀产生的应力和应变最小化。 在最终铜金属化水平之上的一组改进的设计结构通孔，可减轻半导体组装和测试期间的冲击。 其他实施例包括具有变化的微机械支撑结构的设计结构，其进一步最小化半导体封装中的应力和应变。

公开(公告)号：US20120241916A1

公开(公告)日：2012-09-27

申请号：US13053803

申请日：2011-03-22

申请人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Timothy Dooling Sullivan

发明人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Timothy Dooling Sullivan

IPC分类号： H01L29/02 ,  H01L21/302

CPC分类号： H01L21/02021

摘要： The present invention relates to a method for minimizing breakage of wafers during or after a wafer thinning process. A method of forming a rounded edge to the portion of a wafer remaining after surface grinding process is provided. The method comprises providing a semiconductor wafer having an edge and forming a recess in the edge of the wafer using any suitable mechanical or chemical process. The method further comprises forming a substantially continuous curved shape for at least the edge of the wafer located above the recess. Advantageously, the shape of the wafer is formed prior to the backside grind process to prevent problems caused by the otherwise presence of a sharp edge during the backside grind process.

摘要翻译： 本发明涉及一种在晶圆薄化过程中或之后使晶片断裂最小化的方法。 提供了在表面研磨处理之后残留的晶片部分形成圆形边缘的方法。 该方法包括提供具有边缘的半导体晶片，并且使用任何合适的机械或化学过程在晶片的边缘中形成凹陷。 该方法还包括形成至少位于凹部上方的晶片的边缘的基本连续的弯曲形状。 有利地，在背面研磨处理之前形成晶片的形状，以防止在背面研磨过程期间另外存在锋利边缘引起的问题。

公开(公告)号：US09105465B2

公开(公告)日：2015-08-11

申请号：US13053803

申请日：2011-03-22

申请人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Timothy Dooling Sullivan

发明人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Timothy Dooling Sullivan

IPC分类号： H01L29/02 ,  H01L21/02

CPC分类号： H01L21/02021

摘要： The present invention relates to a method for minimizing breakage of wafers during or after a wafer thinning process. A method of forming a rounded edge to the portion of a wafer remaining after surface grinding process is provided. The method comprises providing a semiconductor wafer having an edge and forming a recess in the edge of the wafer using any suitable mechanical or chemical process. The method further comprises forming a substantially continuous curved shape for at least the edge of the wafer located above the recess. Advantageously, the shape of the wafer is formed prior to the backside grind process to prevent problems caused by the otherwise presence of a sharp edge during the backside grind process.

摘要翻译： 本发明涉及一种在晶圆薄化过程中或之后使晶片断裂最小化的方法。 提供了在表面研磨处理之后残留的晶片部分形成圆形边缘的方法。 该方法包括提供具有边缘的半导体晶片，并且使用任何合适的机械或化学过程在晶片的边缘中形成凹陷。 该方法还包括形成至少位于凹部上方的晶片的边缘的基本连续的弯曲形状。 有利地，在背面研磨处理之前形成晶片的形状，以防止在背面研磨过程期间另外存在锋利边缘引起的问题。

公开(公告)号：US08575007B2

公开(公告)日：2013-11-05

申请号：US13073181

申请日：2011-03-28

申请人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Thomas Anthony Wassick

发明人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Thomas Anthony Wassick

IPC分类号： H01L21/326 ,  H01L21/44

CPC分类号： H01L24/14 ,  G06F17/5068 ,  G06F2217/40 ,  H01L24/03 ,  H01L24/05 ,  H01L24/06 ,  H01L24/11 ,  H01L24/13 ,  H01L2224/0401 ,  H01L2224/05027 ,  H01L2224/05124 ,  H01L2224/05147 ,  H01L2224/05155 ,  H01L2224/05166 ,  H01L2224/05557 ,  H01L2224/05562 ,  H01L2224/05563 ,  H01L2224/05572 ,  H01L2224/05647 ,  H01L2224/06051 ,  H01L2224/06102 ,  H01L2224/13006 ,  H01L2224/13076 ,  H01L2224/131 ,  H01L2224/13147 ,  H01L2224/14051 ,  H01L2924/00014 ,  H01L2924/01005 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/01023 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01074 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/10329 ,  H01L2924/00012 ,  H01L2224/05552

摘要： The invention includes embodiments of a method for designing a flip chip and the resulting structure. The starting point is a flip chip with a semiconductor substrate, one or more wiring levels, and a plurality of I/O contact pads (last metal pads/bond pads) for receiving and sending electrical current. There is also a plurality of C4 bumps for connecting the I/O contact pads to another substrate. Then it is determined which of the C4s of the plurality of C4 bumps have a level of susceptibility to electromigration damage that meets or exceeds a threshold level of susceptibility, and in response, plating a conductive structure with a high electrical current carrying capacity (such as a copper pillar, copper pedestal, or partial copper pedestal) onto the corresponding I/O contact pads and adding a solder ball to a top portion of the conductive structure. The resulting structure is a flip chip wherein only a select few C4 bumps use enhanced C4s (such as copper pedestals) reducing the chance of defects.

摘要翻译： 本发明包括用于设计倒装芯片的方法及其结果的实施例。 起点是具有半导体衬底的倒装芯片，一个或多个布线层，以及用于接收和发送电流的多个I / O接触焊盘（最后的金属焊盘/接合焊盘）。 还存在用于将I / O接触焊盘连接到另一衬底的多个C4凸块。 然后，确定多个C4凸块中的哪个C4具有达到或超过阈值磁敏度水平的电迁移损伤的敏感性水平，并且作为响应，电镀具有高电流承载能力的导电结构（例如 铜柱，铜基座或部分铜基座）连接到相应的I / O接触焊盘上，并将焊球添加到导电结构的顶部。 所得到的结构是倒装芯片，其中只有少量的C4凸块使用增强的C4（例如铜基座）来减少缺陷的机会。

公开(公告)号：US20120248604A1

公开(公告)日：2012-10-04

申请号：US13073181

申请日：2011-03-28

申请人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Thomas Anthony Wassick

发明人： Timothy Harrison Daubenspeck ,  Jeffrey P. Gambino ,  Christopher David Muzzy ,  Wolfgang Sauter ,  Thomas Anthony Wassick

IPC分类号： H01L23/488 ,  G06F17/50

CPC分类号： H01L24/14 ,  G06F17/5068 ,  G06F2217/40 ,  H01L24/03 ,  H01L24/05 ,  H01L24/06 ,  H01L24/11 ,  H01L24/13 ,  H01L2224/0401 ,  H01L2224/05027 ,  H01L2224/05124 ,  H01L2224/05147 ,  H01L2224/05155 ,  H01L2224/05166 ,  H01L2224/05557 ,  H01L2224/05562 ,  H01L2224/05563 ,  H01L2224/05572 ,  H01L2224/05647 ,  H01L2224/06051 ,  H01L2224/06102 ,  H01L2224/13006 ,  H01L2224/13076 ,  H01L2224/131 ,  H01L2224/13147 ,  H01L2224/14051 ,  H01L2924/00014 ,  H01L2924/01005 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/01023 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01074 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/10329 ,  H01L2924/00012 ,  H01L2224/05552

摘要： The invention includes embodiments of a method for designing a flip chip and the resulting structure. The starting point is a flip chip with a semiconductor substrate, one or more wiring levels, and a plurality of I/O contact pads (last metal pads/bond pads) for receiving and sending electrical current. There is also a plurality of C4 bumps for connecting the I/O contact pads to another substrate. Then it is determined which of the C4s of the plurality of C4 bumps have a level of susceptibility to electromigration damage that meets or exceeds a threshold level of susceptibility, and in response, plating a conductive structure with a high electrical current carrying capacity (such as a copper pillar, copper pedestal, or partial copper pedestal) onto the corresponding I/O contact pads and adding a solder ball to a top portion of the conductive structure. The resulting structure is a flip chip wherein only a select few C4 bumps use enhanced C4s (such as copper pedestals) reducing the chance of defects.

摘要翻译： 本发明包括用于设计倒装芯片的方法及其结果的实施例。 起点是具有用于接收和发送电流的半导体衬底，一个或多个布线层和多​​个I / O接触焊盘（最后的金属焊盘/接合焊盘）的倒装芯片。 还存在用于将I / O接触焊盘连接到另一衬底的多个C4凸块。 然后，确定多个C4凸块中的哪个C4具有达到或超过阈值磁敏度水平的电迁移损伤的敏感性水平，并且作为响应，电镀具有高电流承载能力的导电结构（例如 铜柱，铜基座或部分铜基座）连接到相应的I / O接触焊盘上，并将焊球添加到导电结构的顶部。 所得到的结构是倒装芯片，其中只有少量的C4凸块使用增强的C4（例如铜基座）来减少缺陷的机会。

公开(公告)号：US08637392B2

公开(公告)日：2014-01-28

申请号：US12700863

申请日：2010-02-05

申请人： Charles L. Arvin ,  Raschid J. Bezama ,  Timothy H. Daubenspeck ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan ,  Brian R. Sundlof

发明人： Charles L. Arvin ,  Raschid J. Bezama ,  Timothy H. Daubenspeck ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan ,  Brian R. Sundlof

IPC分类号： H01L21/44

CPC分类号： H01L24/13 ,  H01L23/49811 ,  H01L24/11 ,  H01L24/16 ,  H01L2224/0401 ,  H01L2224/05647 ,  H01L2224/05655 ,  H01L2224/05666 ,  H01L2224/10126 ,  H01L2224/11334 ,  H01L2224/1146 ,  H01L2224/1147 ,  H01L2224/1182 ,  H01L2224/119 ,  H01L2224/13017 ,  H01L2224/13018 ,  H01L2224/1308 ,  H01L2224/13083 ,  H01L2224/13084 ,  H01L2224/13101 ,  H01L2224/13144 ,  H01L2224/13147 ,  H01L2224/13155 ,  H01L2224/13565 ,  H01L2224/1357 ,  H01L2224/13687 ,  H01L2924/01005 ,  H01L2924/01006 ,  H01L2924/01019 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01074 ,  H01L2924/01079 ,  H01L2924/01082 ,  H01L2924/01327 ,  H01L2924/014 ,  H01L2924/14 ,  H01L2924/3841 ,  H01L2924/00014 ,  H01L2924/01024 ,  H01L2924/01026 ,  H01L2924/01032 ,  H01L2924/00012 ,  H01L2924/00

摘要： A solder interconnect structure is provided with non-wettable sidewalls and methods of manufacturing the same. The method includes forming a nickel or nickel alloy pillar on an underlying surface. The method further includes modifying the sidewall of the nickel or nickel alloy pillar to prevent solder wetting on the sidewall.

摘要翻译： 焊接互连结构设置有不可润湿的侧壁及其制造方法。 该方法包括在下面的表面上形成镍或镍合金支柱。 该方法还包括修改镍或镍合金柱的侧壁以防止在侧壁上的焊料润湿。

公开(公告)号：US08198133B2

公开(公告)日：2012-06-12

申请号：US12458441

申请日：2009-07-13

申请人： Timothy H. Daubenspeck ,  Paul Fortier ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan

发明人： Timothy H. Daubenspeck ,  Paul Fortier ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan

IPC分类号： H01L21/00

CPC分类号： H01L24/05 ,  H01L24/03 ,  H01L24/13 ,  H01L2224/02125 ,  H01L2224/03005 ,  H01L2224/0401 ,  H01L2224/05011 ,  H01L2224/05016 ,  H01L2224/05019 ,  H01L2224/05027 ,  H01L2224/05552 ,  H01L2224/05563 ,  H01L2224/05572 ,  H01L2224/10126 ,  H01L2224/1147 ,  H01L2224/131 ,  H01L2924/0002 ,  H01L2924/01005 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/01015 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01078 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/10253 ,  H01L2924/14 ,  H01L2924/1433 ,  H01L2924/3511 ,  H01L2924/00014 ,  H01L2924/00 ,  H01L2924/00012

摘要： Controlled collapse chip connection (C4) structures and methods of manufacture, and more specifically to structures and methods to improve lead-free C4 interconnect reliability. A structure includes a ball limited metallization (BLM) layer and a controlled collapse chip connection (C4) solder ball formed on the BLM layer. Additionally, the structure includes a final metal pad layer beneath the BLM layer and a cap layer beneath the final metal pad layer. Furthermore, the structure includes an air gap formed beneath the C4 solder ball between the final metal pad layer and one of the BLM layer and the cap layer.

摘要翻译： 控制崩溃芯片连接（C4）结构和制造方法，更具体地说是提高无铅C4互连可靠性的结构和方法。 一种结构包括球限制金属化（BLM）层和形成在BLM层上的受控崩溃芯片连接（C4）焊球。 此外，该结构包括在BLM层下面的最终金属垫层和在最终金属垫层下面的盖层。 此外，该结构包括在最终金属焊盘层和BLM层和盖层之一内的C4焊球之下形成的气隙。

公开(公告)号：US20130119534A1

公开(公告)日：2013-05-16

申请号：US13298183

申请日：2011-11-16

申请人： Timothy H. Daubenspeck ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan

发明人： Timothy H. Daubenspeck ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan

IPC分类号： H01L23/498

CPC分类号： H01L23/3171 ,  H01L23/3192 ,  H01L23/562 ,  H01L24/05 ,  H01L24/06 ,  H01L24/13 ,  H01L24/16 ,  H01L24/81 ,  H01L2224/02126 ,  H01L2224/02235 ,  H01L2224/0401 ,  H01L2224/05019 ,  H01L2224/05022 ,  H01L2224/05166 ,  H01L2224/05171 ,  H01L2224/05552 ,  H01L2224/05556 ,  H01L2224/05558 ,  H01L2224/05572 ,  H01L2224/05582 ,  H01L2224/05583 ,  H01L2224/05647 ,  H01L2224/05655 ,  H01L2224/06051 ,  H01L2224/061 ,  H01L2224/0612 ,  H01L2224/06131 ,  H01L2224/13007 ,  H01L2224/13017 ,  H01L2224/13022 ,  H01L2224/13027 ,  H01L2224/13111 ,  H01L2224/1312 ,  H01L2224/14051 ,  H01L2224/141 ,  H01L2224/16225 ,  H01L2224/81191 ,  H01L2224/81801 ,  H01L2924/00 ,  H01L2924/15311 ,  H01L2924/351 ,  H01L2924/3512 ,  H01L2924/01047 ,  H01L2924/01029 ,  H01L2924/01082 ,  H01L2924/01083 ,  H01L2924/01049 ,  H01L2924/00014 ,  H01L2924/01074 ,  H01L2924/00012

摘要： A topographical feature is formed proximate to a conductive bond pad that is used to couple a solder bump to a semiconductor die. The topographical feature is separated from the conductive bond pad by a gap. In one embodiment, the topographical feature is formed at a location that is slightly beyond the perimeter of the solder bump, wherein an edge of the bump is aligned vertically to coincide with the gap separating the conductive bond pad from the topographical feature. The topographical feature provides thickness enhancement of a non-conductive layer disposed over the semiconductor die and the conductive bond pad and stress buffering.

摘要翻译： 形成靠近用于将焊料凸块耦合到半导体管芯的导电接合焊盘的形貌特征。 地形特征与导电接合垫隔开间隙。 在一个实施例中，形貌特征形成在稍微超出焊料凸块周边的位置处，其中凸块的边缘垂直对齐，以将导电接合焊盘与形貌特征分开。 形貌特征提供了设置在半导体管芯上的非导电层的厚度增强和导电接合焊盘和应力缓冲。

公开(公告)号：US20110006422A1

公开(公告)日：2011-01-13

申请号：US12458441

申请日：2009-07-13

申请人： Timothy H. Daubenspeck ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan

发明人： Timothy H. Daubenspeck ,  Jeffrey P. Gambino ,  Christopher D. Muzzy ,  David L. Questad ,  Wolfgang Sauter ,  Timothy D. Sullivan

IPC分类号： H01L23/498 ,  H01L21/3205 ,  G06F17/50

CPC分类号： H01L24/05 ,  H01L24/03 ,  H01L24/13 ,  H01L2224/02125 ,  H01L2224/03005 ,  H01L2224/0401 ,  H01L2224/05011 ,  H01L2224/05016 ,  H01L2224/05019 ,  H01L2224/05027 ,  H01L2224/05552 ,  H01L2224/05563 ,  H01L2224/05572 ,  H01L2224/10126 ,  H01L2224/1147 ,  H01L2224/131 ,  H01L2924/0002 ,  H01L2924/01005 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/01015 ,  H01L2924/01029 ,  H01L2924/01033 ,  H01L2924/01078 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/10253 ,  H01L2924/14 ,  H01L2924/1433 ,  H01L2924/3511 ,  H01L2924/00014 ,  H01L2924/00 ,  H01L2924/00012

摘要： Controlled collapse chip connection (C4) structures and methods of manufacture, and more specifically to structures and methods to improve lead-free C4 interconnect reliability. A structure includes a ball limited metallization (BLM) layer and a controlled collapse chip connection (C4) solder ball formed on the BLM layer. Additionally, the structure includes a final metal pad layer beneath the BLM layer and a cap layer beneath the final metal pad layer. Furthermore, the structure includes an air gap formed beneath the C4 solder ball between the final metal pad layer and one of the BLM layer and the cap layer.

摘要翻译： 控制崩溃芯片连接（C4）结构和制造方法，更具体地说是提高无铅C4互连可靠性的结构和方法。 一种结构包括球限制金属化（BLM）层和形成在BLM层上的受控崩溃芯片连接（C4）焊球。 此外，该结构包括在BLM层下面的最终金属垫层和在最终金属垫层下面的盖层。 此外，该结构包括在最终金属焊盘层和BLM层和盖层之一内的C4焊球之下形成的气隙。