PATENT DOCUMENT

Publication Number: US-11646302-B2
Application Number: US-202017013279-A
Country: US
Kind Code: B2

Title: Multiple chip module trenched lid and low coefficient of thermal expansion stiffener ring

Abstract:
Multiple chip module (MCM) structures are described. In an embodiment, a module includes a first and second components on the top side of a module substrate, a stiffener structure mounted on the top side of the module substrate, and a lid mounted on the stiffener structure and covering the first component and the second component. The stiffener is joined to the lid within a trench formed in a roof of the lid.

Claims:
What is claimed is: 
     
       1. A module comprising:
 a module substrate; 
 a first component on a top side of the module substrate; 
 a second component on the top side of the module substrate; 
 a stiffener structure mounted on the top side of the module substrate; and 
 a lid mounted on the stiffener structure and covering the first component and the second component; 
 wherein a width of the lid extends past and overhangs a peripheral edge of the module substrate, the lid includes a hanging portion along the width that protrudes downward from a roof of the lid, and the hanging portion of the lid includes an inside edge that is separated from the peripheral edge of the module substrate by a gap. 
 
     
     
       2. The module of  claim 1 , wherein the stiffener structure includes an outer support and an inner support. 
     
     
       3. The module of  claim 2 , wherein the outer support is joined to the lid within a trench formed in a roof of the lid. 
     
     
       4. The module of  claim 3 , wherein the lid comprises an inner wall joined to the inner support of the stiffener structure. 
     
     
       5. The module of  claim 3 , wherein the inner support is joined to the lid within the trench. 
     
     
       6. The module of  claim 5 , wherein the lid comprises an outer wall joined to the outer support of the stiffener structure. 
     
     
       7. The module of  claim 2 , wherein the outer support is joined to the lid within a trench formed in a roof of the lid, and the inner support is joined to the lid within a second trench formed in the roof of the lid. 
     
     
       8. The module of  claim 2 , wherein the stiffener structure is formed of a material with a lower coefficient of thermal expansion (CTE) than the lid. 
     
     
       9. The module of  claim 2 , wherein the outer support and the inner support of the stiffener structure comprise different materials with a different CTE. 
     
     
       10. The module of  claim 2 , wherein the lid comprises physically separate pieces. 
     
     
       11. The module of  claim 10 , wherein the second component comprises a first die and a second die encapsulated within a molding compound and the molding compound fills a space laterally between the first die and the second die. 
     
     
       12. The module of  claim 11 , wherein the lid includes a first lid piece spanning over the first die and a second lid piece spanning over the second die. 
     
     
       13. The module of  claim 12 , wherein the first lid piece has a different chemical composition than the second lid piece. 
     
     
       14. The module of  claim 12 , further comprising a gap between the first lid piece and the second lid piece, wherein the gap is directly above the space laterally between the first die and the second die. 
     
     
       15. The module of  claim 14 , wherein the gap is filled. 
     
     
       16. The module of  claim 1 :
 further comprising a local opening in a roof of the lid; 
 wherein the second component comprises a first die and a second die encapsulated within a molding compound and the molding compound fills a space laterally between the first die and the second die; and 
 wherein the local opening is directly above a space laterally between the first die and the second die. 
 
     
     
       17. The module of  claim 1 , wherein the inside edge of the hanging portion extends past and is laterally adjacent a peripheral edge of the support structure. 
     
     
       18. A module comprising:
 a module substrate; 
 a first component on a top side of the module substrate; 
 a second component on the top side of the module substrate, wherein the second component comprises a first die and a second die encapsulated within a molding compound and the molding compound fills a space laterally between the first die and the second die; 
 a stiffener structure mounted on the top side of the module substrate; and 
 a lid mounted on the stiffener structure and covering the first component and the second component; and 
 a local opening in the roof of the lid, wherein the local opening is directly above a space laterally between the first die and the second die. 
 
     
     
       19. The module of  claim 18 , wherein the stiffener structure includes an outer support and an inner support. 
     
     
       20. The module of  claim 19 , wherein the outer support is joined to the lid within a trench formed in a roof of the lid. 
     
     
       21. The module of  claim 20 , wherein the lid comprises an inner wall joined to the inner support of the stiffener structure. 
     
     
       22. The module of  claim 19 , wherein the inner support is joined to the lid within the trench. 
     
     
       23. The module of  claim 22 , wherein the lid comprises an outer wall joined to the outer support of the stiffener structure. 
     
     
       24. The module of  claim 19 , wherein the outer support is joined to the lid within a trench formed in the roof of the lid, and the inner support is joined to the lid within a second trench formed in the roof of the lid. 
     
     
       25. The module of  claim 19 , wherein the stiffener structure is formed of a material with a lower CTE than the lid. 
     
     
       26. The module of  claim 18 , wherein a peripheral edge of the lid overhangs a peripheral edge of the module substrate. 
     
     
       27. The module of  claim 18 , wherein a peripheral edge of the stiffener structure overhangs the peripheral edge of the module substrate. 
     
     
       28. The module of  claim 18 , wherein the local opening is one of a plurality of local openings in the roof of the lid directly above a space laterally between the first die and the second die. 
     
     
       29. A module comprising:
 a module substrate; 
 a first component on a top side of the module substrate; 
 a second component on the top side of the module substrate; 
 a stiffener structure mounted on the top side of the module substrate, wherein the stiffener structure includes an outer support and an inner support; and 
 a lid mounted on the stiffener structure and covering the first component and the second component, wherein the outer support is joined to the lid within a trench formed in a roof in the lid; 
 wherein a width of the lid extends past and overhangs a peripheral edge of the module substrate, and the lid includes a hanging portion along the width that protrudes downward from the roof of the lid. 
 
     
     
       30. The module of  claim 29 , wherein the inner support is joined to the lid within a second trench formed in the roof of the lid.

Description:
RELATED APPLICATIONS 
     This application claims the benefit of priority from U.S. Provisional Patent Application Ser. No. 63/002,888 filed on Mar. 31, 2020, the full disclosure of which is incorporated herein by reference. 
    
    
     BACKGROUND 
     Field 
     Embodiments described herein relate to multiple chip modules, and in particular to lids thereof. 
     Background Information 
     Lids are widely used in multiple chip modules (MCMs) for a variety of reasons, such as to provide mechanical integrity, hermetic sealing from environment, and thermal performance. In an exemplary implementation one or more components are surface mounted onto a module substrate, and then optionally underfilled. A lid is then secured onto the module substrate and over the component(s). 
     SUMMARY 
     Embodiments describe multiple chip module (MCM) structures in which a combination of lid and stiffener structure is made to obtain the mechanical integrity and thermal benefits of a lid, and reduced warpage provided by the stiffener structure. In particular, the stiffener structure may reduce warpage potentially caused by mismatch of the coefficient of thermal expansion (CTE) of the lid and the rest of the MCM. Various lid designs are described which can further mitigate stress and warpage including trench designs to increase the volume ratio of the stiffener structure to lid, multiple piece lids, and hybrid lids. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is an exploded isometric view illustration of a multiple chip module including a lid and stiffener structure with inner and outer support structures in accordance with an embodiment. 
         FIG.  2 A  is a schematic cross-sectional side view illustration of a lid design on an inner and outer support in accordance with an embodiment. 
         FIG.  2 B  is a schematic cross-sectional side view illustration of a lid design on an outer support in accordance with an embodiment. 
         FIG.  2 C  is a schematic top view illustration of the lid design over a module substrate in accordance with an embodiment. 
         FIG.  3    is a schematic cross-sectional side view illustration of a trenched design of a lid on an outer support in accordance with an embodiment. 
         FIG.  4    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on an inner support in accordance with an embodiment. 
         FIG.  5    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on an outer support in accordance with an embodiment. 
         FIG.  6    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on both an inner and outer support in accordance with an embodiment. 
         FIG.  7    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on an inner or outer support in accordance with an embodiment. 
         FIG.  8    is a schematic cross-sectional side view illustration of a stiffener structure formed of adjacent materials with different coefficients of thermal expansion in accordance with an embodiment. 
         FIG.  9    is a schematic cross-sectional side view illustration of a stiffener structure formed of stacked materials with different coefficients of thermal expansion in accordance with an embodiment. 
         FIG.  10 A  is a schematic top view illustration of a multiple chip module with multiple piece lid in accordance with an embodiment. 
         FIG.  10 B  is a schematic cross-sectional side view illustration of a multiple piece lid with trench design roof components in accordance with an embodiment. 
         FIG.  10 C  is a schematic cross-sectional side view illustration of a multiple piece lid with a component cavity in accordance with an embodiment. 
         FIG.  11 A  is a schematic top view illustration of a multiple chip module with multiple piece lid in accordance with an embodiment. 
         FIG.  11 B  is a schematic cross-sectional side view illustration of a multiple piece lid with trench design wall components in accordance with an embodiment. 
         FIGS.  12 A- 12 B  are a schematic cross-sectional side view illustrations of multiple piece lids formed of different materials in accordance with an embodiment. 
         FIG.  12 C  is a schematic top view illustration of a multiple piece lid formed of different materials in accordance with an embodiment. 
         FIG.  13 A  is a schematic cross-sectional side view illustration of a multiple piece lid with sealed gap in accordance with an embodiment. 
         FIG.  13 B  is a schematic top view illustrations of a multiple piece lid with sealed gap in accordance with an embodiment. 
         FIG.  14 A  is an exploded isometric view illustration of a multiple chip module including a hybrid lid design in accordance with an embodiment. 
         FIG.  14 B  is a schematic cross-sectional side view illustration of a multiple chip module including a hybrid lid design in accordance with an embodiment. 
         FIG.  14 C  is schematic top view illustration of a multiple chip module including a hybrid lid design in accordance with an embodiment. 
         FIG.  15 A  is a schematic cross-sectional side view illustration of a lid design on an inner and outer support and including a local opening in accordance with an embodiment. 
         FIG.  15 B  is a schematic cross-sectional side view illustration of a lid design on an outer support and including a local opening in accordance with an embodiment. 
         FIG.  15 C  is a schematic top view illustration of the lid design including a local opening over a module substrate in accordance with an embodiment. 
         FIG.  16 A  is a schematic cross-sectional side view illustration of a lid design on an inner and outer support with the outer connection area overhanging a module substrate in accordance with an embodiment. 
         FIG.  16 B  is a schematic cross-sectional side view illustration of a lid design on an outer support with the outer connection area overhanging a module substrate in accordance with an embodiment. 
         FIG.  16 C  is a schematic top view illustration of the lid design including an outer connection area overhanging a module substrate in one direction in accordance with an embodiment. 
         FIG.  16 D  is a schematic top view illustration of the lid design including an outer connection area overhanging a module substrate in multiple directions in accordance with an embodiment. 
         FIG.  16 E  is a close up schematic cross-sectional side view illustration of a lid and support structure overhanging a module substrate in accordance with an embodiment. 
         FIG.  16 F  is a close up schematic cross-sectional side view illustration of an L-shaped support structure overhanging a module substrate in accordance with an embodiment. 
         FIG.  16 G  is a close up schematic cross-sectional side view illustration of an L-shaped lid overhanging a module substrate in accordance with an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     While lids can provide mechanical integrity to an MCM, it has been observed that lids can also induce large stress and high warpage in an MCM and induce mechanical failures. For example, lids formed of copper may have a comparatively high coefficient of thermal expansion (CTE) relative to other module features. This can result in thermal expansion and induce stress and warpage in the MCM components (e.g. packages) when the lid is strongly coupled with the rest of the module. In particular, it has been observed that mold cracks can generate between overmolded side-by-side dies, which can be exacerbated by stress induced by a lid. In accordance with embodiments, various combinations of lids and stiffener structures (also referred to as stiffener rings) are provided to balance the ability of the lid to provide mechanical integrity of the module while not inducing mechanical failure. 
     In an accordance with embodiments the lid can include a trenched design. The trenched designs may include sufficient lid volume on top of the module components to retain sufficient thermal performance, while volume of the lid is reduced at connection areas to further reduce stress and warpage caused by the lid. In some embodiments a reduction of volume of the lid can correspond to an increase in volume of a stiffener structure, which increases the volume ratio of the stiffener structure to lid. This can further provide feasibility of selecting the stiffener structure material(s) to reduce the stress and warpage in the MCM. 
     In accordance with embodiments the stiffener structure (e.g. ring) can be fully or partially formed of a low CTE material. In this aspect an increase of the stiffener structure to lid volume ratio (e.g. due to trenched lid design) facilitates the ability to reduce the effective CTE of the lid-stiffener combination by selecting a stiffener material with a lower CTE than the lid. A reduction of effective CTE of the lid-stiffener structure in turn can reduce stress and warpage issues of the MCM. In an exemplary implementation a low CTE stiffener material can be a nickel-iron alloy (FeNi36), iron-nickel-cobalt alloy (sold under the trademark KOVAR, trademark of CRS Holdings, Inc., Delaware), iron-nickel alloy (Alloy42), stainless steels (SUS410, SUS430), etc. while the lid is formed of a higher CTE material such as copper. 
     In accordance with embodiments multiple piece lid designs are described. The multiple piece lid designs may reduce the coupling effect of the lid to the rest of the module, and further reduce stress caused by the lid. This may include a reduction of die-to-die molding compound stress, and module warpage. In some embodiments, the multiple piece lid design incorporates different lid materials to meet different mechanical and thermal requirements of the MCMs. Hybrid lid designs are also described in which lids of different materials are bonded together or embedded, one within the other. By combining different materials, the effective CTE and stiffness of the lid can be tuned to match the target mechanical and thermal performance. 
     In various embodiments, description is made with reference to figures. However, certain embodiments may be practiced without one or more of these specific details, or in combination with other known methods and configurations. In the following description, numerous specific details are set forth, such as specific configurations, dimensions and processes, etc., in order to provide a thorough understanding of the embodiments. In other instances, well-known semiconductor processes and manufacturing techniques have not been described in particular detail in order to not unnecessarily obscure the embodiments. Reference throughout this specification to “one embodiment” means that a particular feature, structure, configuration, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase “in one embodiment” in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, configurations, or characteristics may be combined in any suitable manner in one or more embodiments. 
     The terms “above”, “over”, “to”, “between”, “spanning” and “on” as used herein may refer to a relative position of one layer with respect to other layers. One layer “above”, “over”, “spanning” or “on” another layer or bonded “to” or in “contact” with another layer may be directly in contact with the other layer or may have one or more intervening layers. One layer “between” layers may be directly in contact with the layers or may have one or more intervening layers. 
     Referring now to  FIG.  1    a cross-sectional side view illustration is provided of an MCM  150  including a lid  300  and stiffener structure  200  with inner and outer supports  220 ,  210 , respectively. In the exemplary embodiment, the MCM  150  includes a module substrate  100  including a top side  102  and bottom side  104 . A plurality of first components  120  can be mounted on the top side  102  of the module substrate  100 . First components  120  may be active or passive devices, and may be chips or packages. For example, first components  120  may be memory packages, such as dynamic random-access memory (DRAM) including one or more dies, which can be stacked dies, or side-by-side. In an embodiment, first components are chip scale packages. First components  120  can additionally be different types of components, and need not be identical. One or second components  130  can also be mounted on the top side  102  of the module substrate  100 . In an embodiment, a second component  130  is a package that includes a plurality (e.g. two or more) of side-by-side dies. For example, second component  130  may include a plurality of side-by-side logic, or system on chip dies. 
     Referring now to  FIGS.  2 A- 2 C  schematic cross-sectional side view and top view illustrations are provided of lid and stiffener structure arrangements in accordance with embodiments. In an exemplary implementation, first components  120  and second component  130  are surface mounted onto the module substrate  100  using any suitable technique such as solder bumps  160 , with optional underfill  162  (e.g. epoxy). In the illustrated embodiment, the second component  130  is a package that includes a plurality of side-by-side dies  132  encapsulated in a molding compound  134 . As shown, the space  133  laterally between the dies  132  may be filled with molding compound  134 . It has been observed this can be a high stress location within the MCM due to close proximity of a variety of materials and MCM structures. 
     A thermal interface material (TIM)  170  can be located on top sides of the first components  120  and second component  130  in order to secure to the lid  300 . TIM  170  may be applied using any suitable technique such as dispensing or tape. Exemplary TIM  170  materials include, but are not limited to, thermal grease, solder, metal filled polymer matrix, etc. 
     In accordance with embodiments the lid  300  can be bonded to an intermediate stiffener structure  200  (also referred to as a stiffener ring), which in turn is bonded to the module substrate  100 . The stiffener structure  200  and lid  300  can be bonded using an adhesive material. For example, and adhesive can be dispensed onto the module substrate  100  at the connection areas (e.g. outer connection area  180  and inner connection area  182 ), followed by mounting the stiffener structure  200 . Exemplary adhesive materials include glass paste, epoxies, urethane, polyurethane, silicone elastomers, etc. The lid  300  can similarly be bonded to the stiffener structure  200  after mounting the stiffener structure on the module substrate  100 , or before. 
     As illustrated the lid  300  may include a roof  330 , outer (periphery) walls  310  and optionally inner walls  320 . The bottom surface  302  of the roof may be bonded to the TIM  170  on top of the second component  130  and first components  120 . Contour of the bottom surface  302  (thickness of the roof  330 ) can be adjusted to evenly mate with the TIM  170  for the various first components  120  and second component  130 . The outer walls  310  and inner walls  320  can extend from the roof  330  (e.g. protrude from the bottom surface) to form one or more cavities  305  which accommodate the second component  130  and first components  120 . In accordance with embodiments, the stiffener structure  200  is shaped to mate with the outer walls  310  and inner walls  320  of the lid  300 . Specifically, the stiffener structure  200  can include outer support (walls)  210  and inner support  220  (walls). Outer support  210  and inner support  220  may be integrally formed of the same material. Alternatively, outer support  210  and inner support  220  can be formed of different materials with different CTE. A variety of additional configurations, with different materials are possible. The mating surfaces between the stiffener structure  200  and lid  300  may have a same surface area. A plurality of module solder bumps  190  may optionally be applied to the bottom side  104  of the module substrate  100  for further integration. 
     In accordance with embodiments, various combinations of lids and stiffener structures are provided to balance the ability of the lid to provide mechanical integrity to the module while not inducing mechanical failure. In particular, various combinations of trenched lid designs, ratios of stiffener structure to lid volume, multiple piece lid designs, and combinations of materials with different CTE are described. 
     Referring now to  FIGS.  3 - 9    various trenched lid designs and stiffener structures are illustrated in accordance with embodiments. As shown, the MCM  150  may include a module substrate  100 , a first component  120  on the top side  102  of the module substrate and a second component  130  on the top side  102  of the module substrate. A stiffener structure  200  is mounted on the top side  102  of the module substrate and a lid  300  is mounted on the stiffener structure  200  and covering both the first component  120  and the second component  130 . In accordance with various embodiments, the stiffener structure  200  may be joined to the lid  300  within a trench  315  formed in a roof  330  of the lid. The stiffener structure  200  can include either or both of an outer support  210  and an inner support  220 . 
       FIG.  3    is a schematic cross-sectional side view illustration of a trenched design of a lid on an outer support  210  in accordance with an embodiment. As shown, a trench  315  is formed in the bottom surface  302  of the roof  330  of the lid  300 . Each trench  315  may include one or more trench edges (sidewalls)  331  in the roof  330 . In this manner, a thickness of the roof  330  in the trench  315  area is less than a thickness of the roof  330  where the lid  300  is connected to the second component  130  with TIM  170 , and where the lid  300  is connected to the first components  120  with TIM. Thus, the trench  315  reduces the volume of the lid  300  at the connection area. Specifically, the trench  315  is formed at the outer (periphery) connection area  180  where the trench is joined with the outer support (walls)  210  of the stiffener structure  200 . In this illustration the trench does not include outer sidewalls (trench edge). In the illustrated embodiment the outer support  210  is joined to the lid  300  within the trench  315 . While not illustrated, the lid  300  may additionally include an inner wall  320  joined to an inner support  220  of the stiffener structure  200 . 
       FIG.  4    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on an inner support in accordance with an embodiment. As shown, the inner support  220  is joined to the lid  300  within the trench  315 . Additionally, the lid  300  includes an outer wall  310  joined to the outer support  210 . In the illustrated embodiment the inner support  220  is taller than the outer support  210 . 
       FIG.  5    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on an outer support in accordance with an embodiment. As shown, the outer support  210  is joined to the lid  300  within the trench. The lid  300  additionally includes an inner wall  320  joined to the inner support  220 . In the illustrated embodiment the outer support  210  is taller than the inner support  220 . Also shown in  FIG.  5   , the inner wall  320  extends from the trench  315 . In an embodiment, the lid  300  can include both outer walls  310  and inner walls  320  extending from a trench  315 . 
       FIG.  6    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on both an inner and outer support in accordance with an embodiment.  FIG.  6    is similar to the embodiment illustrated in  FIG.  3    with the addition of the inner support  220  also joined to the lid within a trench  315 , which may be the same trench or a separate trench than the trench  315  where the outer support  210  is joined to the lid. 
       FIG.  7    is a schematic cross-sectional side view illustration of a partial trenched design of a lid on an inner or outer support in accordance with an embodiment. As shown,  FIG.  7    combines features of  FIGS.  4 - 6    to show a variety of configurations are possible, where portions of the inner support  220  and outer support  210  can have different heights, and outer wall  310  and inner wall  320  can be discontinuous. 
     The trenched lid designs in accordance with embodiments can reduce the volume of lid at the connection areas to reduce stress and warpage caused by the lid. Furthermore, the reduction of volume of the lid can correspond to an increase in volume (height) of a stiffener structure, which increases the volume ratio of the stiffener structure to lid. In the illustrated embodiments, the ratio of stiffener structure to lid is greater than 1, meaning the stiffener structure can be taller than a thickness of the trenched roof of the lid. 
     In accordance with embodiments the stiffener structure can be fully or partially formed of a low CTE material. In an exemplary implementation a low CTE stiffener material can be a nickel-iron alloy (FeNi36), iron-nickel-cobalt alloy (sold under the trademark KOVAR, trademark of CRS Holdings, Inc., Delaware), iron-nickel alloy (Alloy42), stainless steels (SUS410, SUS430), etc. while the lid is formed of a higher CTE material such as copper. The stiffener structure can also be formed of different materials (different chemical composition, or alloy ratios) to tune stress and warpage. 
       FIG.  8    is a schematic cross-sectional side view illustration of a stiffener structure formed of adjacent materials with different coefficients of thermal expansion in accordance with an embodiment. For example, the outer support  210  and the inner support  220  can be formed of different materials  221 ,  223  with a different CTE. Also, different areas of the outer support  210  and inner support  220  can be formed of different materials  221 ,  223  to locally tune stress and warpage. 
       FIG.  9    is a schematic cross-sectional side view illustration of a stiffener structure formed of stacked materials  221 ,  223  with different coefficients of thermal expansion in accordance with an embodiment. Furthermore, the relative thickness of the stacked materials  221 ,  223  can be different in different areas of the outer support  210  and inner support  220 . 
     The lids in accordance with embodiments may also have a plurality of physically separate pieces. Such multiple piece lid designs may reduce the coupling effect of the lid to the rest of the module, and further reduce stress caused by the lid. This may include a reduction of die-to-die molding compound stress, and module warpage. 
     Referring now to  FIGS.  10 A- 10 C  schematic top view and cross-sectional side view illustrations are provided of a multiple piece lid in accordance with embodiments. In the illustrated embodiment the lid  300  may include a plurality of physically separate roofs  330 A,  330 B,  330 C bonded to the stiffener structure  200 . The roofs  330 A,  330 B,  330 C may additionally have a trench design including trenches  315 . In the illustrated embodiments, trenches  315  may be formed along the sides of the roofs  330 A,  330 B,  330 C such that a pair of roofs are bonded to each inner support  220 , and a single roof is bonded to each outer support  210 . Each lid may be anchored to its surrounding inner support  220 , and/or outer support  210 . In the particular embodiment illustrated in  FIG.  10 C , the lid may further include a component recess  335  which mates with a component (e.g. second component  130 ) edges. The component recess  335  may promote coverage of the TIM  170  with the component edges and reduce TIM peeling stress. 
     Referring now to  FIGS.  11 A- 11 B  schematic top view and cross-sectional side view illustrations are provided of a multiple piece lid in accordance with embodiments.  FIGS.  11 A- 11 B  differ from the embodiment of  FIGS.  10 A- 10 B  in that the trenches  225  are formed within the inner support  220  and/or outer support  210  as opposed to the roofs of the lid. Similarly, trenches  225  may include trench edges  227 . In the particular embodiment illustrated, the inner supports  220  include trenches  225  to accommodate a roof  330 A of lid  300 . The physically separate roofs  330 A,  330 B,  330 C of  FIG.  11 A- 11 B  may have different thicknesses to manage stress and warpage. 
     The multiple piece lid designs in accordance with embodiments may also include inner and/or outer walls. Referring now to  FIGS.  12 A- 12 C  schematic cross-sectional side view and top view illustrations are provided of multiple piece lids in accordance with an embodiment. It is to be appreciated that while illustrated and described separately, that the multiple piece lid embodiments of  FIGS.  12 A- 12 C  are combinable with the multiple piece lid embodiments of  FIGS.  10 A- 11 B , as well as other embodiments described herein. 
     As shown the multiple piece lid  300  may include a first lid piece  300 A spanning over a first die  132  in the second component  130  and a second lid piece  300 B spanning over a second die  132  in the second component  130 . Multiple lid pieces may be included  300 A,  300 B,  300 C,  300 D, etc. As shown, the molding compound  134  may fill a space  133  laterally between the first die  132  and the second die  132 , which can correspond to a high stress region. A gap  325  may be located between the first lid piece  300 A and the second lid piece  300 B. In the illustrated embodiment the gap  325  is directly above the space  133  that is laterally between the first die  132  and the second die  132  of the component  130 , which may be filled with the molding compound  134 . The gap  325  may further reduce the coupling effect of the lid to the rest of the module, and further reduce stress caused by the lid. In accordance with embodiments, the separate lid pieces  300 A,  300 B, etc. may be formed of different materials  321 ,  323 . Use of different lid material may be tuned to meet different mechanical and thermal requirements of the microelectronic module. The gap  325  may optionally be filled as shown in  FIGS.  13 A- 13 B  with a fill material  400 . For example, the fill material may be a solder, adhesive, etc. 
     Referring now to  FIGS.  14 A- 14 C  exploded isometric, schematic cross-sectional side view, and top view illustrations are provided of a multiple chip module including a hybrid lid design in accordance with embodiments. In addition, or alternative to, the aforementioned structures a hybrid lid  300  design can include different materials bonded together or embedded, one within the other. By combining different materials, the effective CTE and stiffness of the lid can be tuned to match the target mechanical and thermal performance. In an embodiment, a lid  300  may include a first lid pattern  500  bonded to a roof  330  of a main lid structure, wherein the first lid pattern  500  has a different CTE than the main lid structure. The main lid structure may be similar to the previously described lids  300  with the addition of a female pattern  360  into which the first lid pattern  500  is secured. The first lid pattern  500  may include a variety of features, which may optionally include an inner rib  520  and outer (peripheral) contour  510 . The first lid pattern  500  may be located at high stress regions, such as at connection areas ( 180 ,  182 ) and over the space between side-by-side dies. In an embodiment, the inner rib  520  is directly over the space  133  between adjacent dies  132 . 
     Up until this point the lid structures have been illustrated and described as being single or multiple piece lid arrangements. In accordance with embodiments, one or more local openings may be formed in any of the lid structures to reduce stress and warpage.  FIGS.  15 A- 15 C  illustrate an exemplary implementation of such a local opening  326 . As shown,  FIGS.  15 A- 15 C  are similar to the lid design previously illustrated and described with regard to  FIGS.  2 A- 2 C , though embodiments are not so limited. In an embodiment, the one or more local openings  326  may be located directly above (over) the space  133  laterally between dies  132 . The one or more local opening  326  may completely or partially overlap the space  133 . One or more local openings can also be located over other regions to mitigate stress. In an embodiment, the one or more local openings  326  are formed completely through the roof  330  of the lid from the top side  304  to the bottom surface  302  of the roof  330 . 
     The stiffener structure(s)  200  and/or lid(s)  300  can also be designed to overhang peripheral edges of module substrate  100  to reduce stress and warpage.  FIG.  16 A  is a schematic cross-sectional side view illustration of a lid design on an inner and outer support with the outer connection area  180  overhanging the module substrate  100  in accordance with an embodiment.  FIG.  16 B  is a schematic cross-sectional side view illustration of a lid design on an outer support with the outer connection area  180  overhanging the module substrate  100  in accordance with an embodiment. The particular embodiments illustrated in  FIGS.  16 A- 16 B  are similar to those previously illustrated and described with regard to  FIGS.  2 A- 2 B , however, this is merely exemplary and the overhanging designs are combinable with any of the stiffener structure  200  inner and outer supports  220 ,  210 , and lid  300  combinations with corresponding inner walls  320  and outer walls  310 . The overhanging designs are also compatible with the multiple piece lid structures described herein. 
     The overhanging lid designs in accordance with embodiments may overhang one or more, or all, peripheral (lateral) edges  106  of the module substrate  100 . In particular, one or more peripheral edges  216  of the stiffener structure  200  and/or peripheral edges  316  of the lid(s)  300  corresponding to the outer connection areas  180  may overhang one or more peripheral edges  106  of the module substrate. Specifically, the peripheral edges  216  of the outer supports  210  and peripheral edges  316  of the outer walls  310  of the lids  300  may overhang the peripheral edges  106  of the module substrate  100 .  FIG.  16 C  is a schematic top view illustration of the lid  300  design including an outer connection area overhanging a module substrate in one direction in accordance with an embodiment. As shown, the peripheral edges  316  of the lid  300  outer walls  310  extend laterally past the peripheral edges  106  on two opposite sides of the module substrate  100 .  FIG.  16 D  is a schematic top view illustration of the lid  300  design including an outer connection area overhanging a module substrate in multiple directions in accordance with an embodiment. As shown, the peripheral edges  316  of the lid  300  outer walls  310  extend laterally past the peripheral edges  106  on four sides of the module substrate  100 . While not visible in the top view illustrations of  FIGS.  16 C- 16 D , the peripheral edges  216  of the stiffener structure  200  outer supports  210  can be similarly oriented, or alternatively oriented if the lid  300  does not include outer walls  310 . It is to be appreciated the particular orientations of  FIGS.  16 B- 16 C  are exemplary and various alternative arrangements are possible with the outer connection areas to overhang one or more peripheral edges  106  of the module substrate. Additionally, the outer connection areas  180  may partially or fully overhang a length of any of the peripheral edges  106  of the module substrate  100 . 
     Referring now to  FIG.  16 E  a close up schematic cross-sectional side view illustration is provided of a lid  300  and support structure  200  overhanging a module substrate in accordance with an embodiment. In such a configuration, the bottom side  211  of the support structure  200  may be level, or planar. As shown, the peripheral edges  216 ,  316  of the support structure  200  and lid  300  overlap (or extend past) the peripheral edge  106  of the module substrate  100  by a width (W). The support structure  200  and/or lid  300  may also have an L-shape configuration where a hanging portion of the support structure and/or lid  300  is laterally adjacent to a peripheral edge  106  of the module substrate  100 . In such configurations the bottom side  211  of the support structure  200  or the bottom side  311  of the lid  300  can have an L-shape profile. 
       FIG.  16 F  is a close up schematic cross-sectional side view illustration of an L-shaped support structure  200  overhanging a module substrate  100  in accordance with an embodiment. As shown, the support structure  200  may overlap (or extend past) the peripheral edge  106  of the module substrate  100  by a width (W), and also include a hanging portion  213  that protrudes downward and is laterally adjacent the peripheral edge  106  of the module substrate  100 . The hanging portion  213  may include an inside edge  217  that is separated from the peripheral edge  106  by a gap (G). 
       FIG.  16 G  is a close up schematic cross-sectional side view illustration of an L-shaped lid  300  overhanging a module substrate  100  in accordance with an embodiment. As shown, the lid  300  may overlap (or extend past) the peripheral edge  106  of the module substrate  100  by a width (W), and also include a hanging portion  313  that protrudes downward and is laterally adjacent the peripheral edge  106  of the module substrate  100 . The hanging portion  313  may include an inside edge  317  that is separated from the peripheral edge  106  by a gap (G). 
     In utilizing the various aspects of the embodiments, it would become apparent to one skilled in the art that combinations or variations of the above embodiments are possible for integrating an MCM lid structure while mitigating module warpage. Although the embodiments have been described in language specific to structural features and/or methodological acts, it is to be understood that the appended claims are not necessarily limited to the specific features or acts described. The specific features and acts disclosed are instead to be understood as embodiments of the claims useful for illustration.

Metadata:
Filing Date: 20200904
Publication Date: 20230509
Grant Date: 20230509
Priority Date: 20200331
Inventors: CHEN, WEI
ZHAO, JIE-HUA
ZHAI, JUN
CHANG, PO-HAO
LIN, HSIEN-CHE
KE, YING-CHIEH
HU, KUNZHONG
Assignee: APPLE INC
CPC Classifications: [{"code": "H01L23/053", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L24/92", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L25/18", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01L25/0655", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L24/16", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L23/562", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L2924/16153", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L25/0655", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2924/19105", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L23/24", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L2224/32245", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L25/03", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L24/13", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2224/92125", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2224/131", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L24/83", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L23/06", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L23/3675", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L23/10", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01L2224/73253", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L24/32", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L24/73", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2224/32225", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2224/16227", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2924/164", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L23/16", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L2224/73204", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2924/16251", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2924/1615", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L23/42", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L2924/3511", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2224/83385", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L2924/16151", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L23/3185", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L23/04", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01L2924/15311", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L25/18", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01L23/24", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 77857563