METHOD OF MANUFACTURING SEMICONDUCTOR DEVICE USING GAS BLOWING AGENT

A method of manufacturing a semiconductor device may include bonding a carrier substrate onto a device wafer using an adhesive member, wherein the adhesive member includes a base film, a device adhesive film disposed on a lower surface of the base film and contacting the device wafer, and a carrier adhesive film disposed on an upper surface of the base film and contacting the carrier substrate. The device adhesive film includes a gas blowing agent, and the carrier adhesive film may not include a gas blowing agent.

CROSS-REFERENCE TO RELATED APPLICATIONS

This U.S. non-provisional patent application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2021-0117324, filed on Sep. 3, 2021, the entire contents of which are hereby incorporated by reference.

BACKGROUND

The present disclosure herein relates to a method for manufacturing a semiconductor device, and more particularly, to a method for manufacturing a semiconductor device using a gas blowing agent.

With the development of electronics industry, electronic components are required to have higher-level functions, higher speed, and smaller size. To support this trend, the size of a semiconductor chip may be reduced. To this end, a wafer is processed to reduce its thickness through a back grinding process or the like during a semiconductor manufacturing process. However, a crack may occur in a wafer during a semiconductor memory device manufacturing process, thus causing a reduction in yield.

SUMMARY

The present disclosure provides a method of manufacturing a semiconductor device capable of improving yield.

The purposes of the present disclosure are not limited to the above-mentioned purposes, and other purposes not mentioned will be understood by those skilled in the art from the disclosure below.

An embodiment of the inventive concept provides a method for manufacturing a semiconductor device, including bonding a carrier substrate onto a device wafer with an adhesive member, wherein the adhesive member includes a base film, a device adhesive film disposed on a first (e.g., lower) surface of the base film and contacting the device wafer, and a carrier adhesive film disposed on a second (e.g., upper) surface of the base film and contacting the carrier substrate, wherein the device adhesive film includes a gas blowing agent, and the carrier adhesive film does not include a gas blowing agent.

In an embodiment of the inventive concept, a method of manufacturing a semiconductor device includes: bonding a carrier substrate onto a device wafer with an adhesive member therebetween; a first curing of the adhesive member by radiating first light of a first wavelength through the carrier substrate; reducing a thickness of the device wafer by performing a back grinding process on the device wafer; a second curing of the adhesive member by radiating second light of a second wavelength that is different from the first wavelength through the carrier substrate, and forming pores between the adhesive member and the wafer substrate; and separating the carrier substrate and the adhesive member from the device wafer.

In an embodiment of the inventive concept, a method of manufacturing a semiconductor device includes: bonding a carrier substrate onto a device wafer with an adhesive member; a first curing the adhesive member by radiating first ultraviolet light of a first wavelength through the carrier substrate; reducing a thickness of the device wafer by performing a back grinding process on the device wafer; a second curing the adhesive member by radiating second ultraviolet light of a second wavelength that is different from the first wavelength through the carrier substrate, and forming pores between the adhesive member and the wafer substrate; and separating the carrier substrate and the adhesive member from the device wafer, wherein the adhesive member includes: a base film; a device adhesive film disposed on a lower surface of the base film and contacting the device wafer; and a carrier adhesive film disposed on an upper surface of the base film and contacting the carrier substrate, wherein the device adhesive film includes a gas blowing agent, and the carrier adhesive film does not include a gas blowing agent.

DETAILED DESCRIPTION

Hereinafter, embodiments according to the inventive concept will be described in detail with reference to the drawings.

FIG.1is a flowchart illustrating a method for manufacturing a semiconductor device according to embodiments of the inventive concept.FIGS.2A to2Hare cross-sectional views sequentially illustrating a method for manufacturing a semiconductor device according to embodiments of the inventive concept.FIG.3Ais an enlarged view of the portion P1ofFIG.2Aaccording to embodiments of the inventive concept.FIG.3Bis an enlarged view of the portion P2ofFIG.2Baccording to embodiments of the inventive concept.FIG.3Cis an enlarged view of the portion P1ofFIG.2Caccording to embodiments of the inventive concept.FIG.3Dis an enlarged view of the portion P1ofFIG.2Daccording to embodiments of the inventive concept.FIG.3Eis an enlarged view of the portion P2ofFIG.2Eaccording to embodiments of the inventive concept.

Referring toFIGS.1and2A, a carrier substrate10, a device wafer30, and an adhesive member20are prepared. The carrier substrate10is bonded to the device wafer30with the adhesive member20(formed therebetween) (first operation, S10).

The carrier substrate10may be transparent. For example, the carrier substrate10may be formed of glass and allow transmission of light (e.g., ultraviolet light) that may cause a chemical reaction in or otherwise change the characteristics of the adhesive member20.

The device wafer30may have various semiconductor devices are formed therein. The device wafer30includes a first surface30aand a second surface30bfacing away from each other. The first surface30amay be a backside surface of the device wafer30and the second surface30bmay be an active surface of the device wafer30(corresponding to active surfaces of the semiconductor devices formed therein). The device wafer30includes a plurality of chip regions CR, scribe regions SR therebetween, and a edge region ER at the edge of the device wafer30. The scribe regions SR may be formed as scribe lanes running in two perpendicular directions (from a top down perspective) to define a grid with chip regions CR forming grid elements of the grid. The edge region ER may form a bezel and may have a height difference with upper portions of the chip regions CR. Each chip region CR may form a semiconductor device that when cut form the device wafer30forms a corresponding semiconductor chip.

Referring toFIG.3A, in detail, the device wafer30includes transistors TR formed on and/or in a wafer substrate30cin the chip regions CR. The wafer substrate30cmay be a crystalline semiconductor (e.g., crystalline Si, Si/Ge, Ge, etc.) and may be selectively doped with charge carrier dopants. The exposed surface of the wafer substrate30c(lower surface inFIGS.2A,2B and3A) may form the device wafer30first surface30a(e.g., a backside surface of the device wafer30). Portions of the wafer substrate30cmay form substrates of the semiconductor devices formed in the chip regions CR.FIG.3Aillustrates a transistor TR having a gate (hashed portion) formed on wafer substrate30c, with a gate dielectric separating the gate from the wafer substrate30c. As is conventional, the transistor TR may include a channel region (not shown) formed in the substrate30cand have source/drain regions (not shown) formed on opposite sides of the channel region. The transistors TR are covered with interlayer dielectrics34(ILDs). Wirings33are arranged between the interlayer dielectrics34. Each interlayer dielectric34may be formed as a single layer or multilayer structure of at least one of SiN, SiO2, SiON, SiOC, tetraethyl orthosilicate (TEOS), high density plasma (HDP) oxide, undoped silicate glass (USG), SiCN, or porous insulating material. The wirings33may be formed of a single layer or multiple layers of metal such as tungsten, aluminum, copper, titanium, tantalum, ruthenium, and/or iridium. Each layer of wirings33may comprise a plurality of separately formed wirings33that are interconnected to other corresponding wirings33of other layer of wirings33to interconnect various transistors TR to each other (to form logic devices and interconnections between logic devices to form an integrated circuit of the corresponding semiconductor device) as well as to interconnect external terminals of the semiconductor device to the integrated circuit (e.g., to provide power and communicate signals between the semiconductor device and an external device).

FIG.3Cillustrates structure for forming a through substrate via (TSV)35penetrates a portion of the wafer substrate30cand a lowermost interlayer dielectric34among the interlayer dielectrics34. Upon further processing (e.g., as shown inFIG.3Cand described below), the through substrate vias35fully penetrate the wafer substrate30c(e.g., after thinning the wafer substrate30c). The through substrate via35may contact a lowermost wiring33among the wirings33. The through substrate via35may be formed of metal such as copper and tungsten. A diffusion barrier film32and a via insulating film31may be conformally arranged between the through substrate via35and the wafer substrate30cand between the through substrate via35and the interlayer dielectric34. The diffusion barrier film32and the via insulating film31may cover a lower surface of the through substrate via35. The via insulating film31may be spaced apart from a lower surface of the wafer substrate30c. The diffusion barrier film32may include, for example, at least one of titanium, tantalum, titanium nitride, tantalum nitride, or tungsten nitride. The via insulating film31may include, for example, a silicon oxide. Alternative structures and processes for forming the through substrate vias35are also applicable, such as through substrate vias35that fully penetrate the entire semiconductor device (to extend to second surface30b). When the wafer substrate30cis formed of silicon, the through substrate vias35may be referred to as through silicon vias35.

A first conductive pad36is disposed on an uppermost interlayer dielectric34. First conductive pads36may be chip pads formed at the outermost surface of the device wafer30and form external terminals of the semiconductor devices. The uppermost interlayer dielectric34and a portion of the first conductive pad36are covered with a first passivation film37. The first passivation film37may form an outermost layer of the semiconductor devices and form second surface30b. The first passivation film37may initially cover the first conductive pads36, and then patterned to form corresponding holes in the first passivation film37that expose corresponding first conductive pads36for connecting the semiconductor devices to external devices. For example,FIG.3Aillustrates a first conductive bump38which may be disposed on and contact the first conductive pad36through a hole in the first passivation film. The first conductive bump38may be formed of tin, lead, copper, or the like. The first conductive bump38may include at least one of a copper bump, copper pillar, or solder ball. The first conductive bump38may protrude above the first passivation film37so that the second surface30bmay have a protrusion-and-recess structure. Alternatively, an upper surface of the first conductive bump38may be coplanar with an upper surface of the first passivation film37, and the second surface30bmay be even. Alternatively, the conductive bump38may be added at a later time, such as after separating the semiconductor devices (e.g., singulating the wafer).

AlthoughFIG.3Aillustrates the through substrate via35as contacting the lowermost wiring33, the through substrate via35may contact the wiring33of another layer, may have an upper surface having the same height as an upper surface of the wafer substrate30c, or fully extend through the device wafer30and terminate at the second surface30b.

Referring back toFIG.2A, the adhesive member20is a multi-layered film and may include a base film21, a carrier adhesive film23contacting an upper surface of the base film21and contacting the carrier substrate10, and a device adhesive film25contacting a lower surface of the base film21and contacting the device wafer30. The adhesive member20, for example, may be a double sided tape. That is, the adhesive member20may be provided in a form in which two sides of the base film21are respectively coated with the carrier adhesive film23and the device adhesive film25. The carrier adhesive film23may have a thickness of about 10 nm to about 500 μm. The base film21may have a thickness of about 10 nm to about 500 μm. The device adhesive film25may have a thickness of about 10 nm to about 500 μm.

The base film21may serve to support the carrier adhesive film23and the device adhesive film25. The base film21may absorb light of a wavelength of about 300 nm or less.

Since the base film21is provided, the adhesive member20may be easily handled, and a wafer support system (WSS) process may be performed with ease. The base film21, for example, may be transparent to allow ultraviolet light to be transmitted therethrough. The base film21may be insensitive to may not react with light within a certain wavelength, such as being insensitive to ultraviolet light. The base film21, for example, may be a polymer film such as polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), and polyimide (PI).

The carrier adhesive film23may include a first resin, a first cross-linking agent, a first filler, and a first release agent so as to have appropriate bonding force on a surface of the carrier substrate10. The device adhesive film25may include a second resin, a second cross-linking agent, a second filler, and a second release agent so as to have appropriate bonding force to a surface of the device wafer30. The first resin and the second resin may be the same or different from each other. The first resin and the second resin, for example, may be an acrylate-based polymer. The first resin and the second resin, for example, may have a structure of Chemical Formula 1 below.

In Chemical Formula 1, n denotes an arbitrary natural number, and R may denote one of hydrogen, alkyl group, alkenyl group, and alkanyl group.

The first cross-linking agent and the second cross-linking agent may be the same or different from each other. The first cross-linking agent and the second cross-linking agent, for example, may be cyanate-based. The first cross-linking agent and the second cross-linking agent, for example, may individually have one of structure I and structure II of Chemical Formula 2 below.

In Chemical Formula 2, R may denote one of hydrogen, alkyl group, alkenyl group, and alkanyl group. Bonding force of the carrier adhesive film23and the device adhesive film25may be adjusted according to content of the first cross-linking agent and the second cross-linking agent.

The first filler and the second filler may be the same or different from each other. The first filler and the second filler, for example, may be silica, alumina, ceria, or titania. The first filler and the second filler may be added to adjust mechanical strength or modulus of the carrier adhesive film23and the device adhesive film25.

The first release agent and the second release agent may be the same or different from each other. The first release agent and the second release agent, for example, may be silicone acrylate. The first release agent and the second release agent, for example, may have a structure of Chemical Formula 3 below.

In Chemical Formula 3, q denotes an arbitrary natural number, and R may denote one of alkyl group, alkenyl group, and alkanyl group. In Chemical Formula 3, a silicon-bonded part is hydrophobic, and thus may deteriorate adhesive strength. The first release agent and the second release agent may be added to adjust adhesive strength of the carrier adhesive film23and the device adhesive film25.

The device adhesive film25may further include a gas blowing agent. On the contrary, the carrier adhesive film23may not include the gas blowing agent. The gas blowing agent may be a material (or photoinitiator), which is decomposed by light of a specific wavelength causing formation of a gas, such as formation of nitrogen gas. A highly reactive radical may also be formed during such decomposition.

The gas blowing agent may be diazirine. As shown in Chemical Reaction Formula 1 below, the diazirine, for example, may be decomposed by ultraviolet light of a wavelength W2of about 350 nm to about 400 nm, more specifically, about 355 nm, thus forming nitrogen (N2) gas and a carbene radical.

In Chemical Reaction Formula 1, R1 and R2 of the diazirine may individually denote one of hydrogen, alkyl group, alkenyl group, and alkanyl group.

The carrier adhesive film23may include the first resin in an amount of about 80-99 wt % based on a total weight of the carrier adhesive film23. The carrier adhesive film23may include the first cross-linking agent in an amount of about 0.001-1 wt % based on the total weight of the carrier adhesive film23. The carrier adhesive film23may include the first filler in an amount of about 0.001-1 wt % based on the total weight of the carrier adhesive film23. The carrier adhesive film23may include the first release agent in an amount of about 0.001-1 wt % based on the total weight of the carrier adhesive film23.

The device adhesive film25may include the second resin in an amount of about 80-99 wt % based on a total weight of the device adhesive film25. The device adhesive film25may include the second cross-linking agent in an amount of about 0.001-1 wt % based on the total weight of the device adhesive film25. The device adhesive film25may include the second filler in an amount of about 0.001-1 wt % based on the total weight of the device adhesive film25. The device adhesive film25may include the second release agent in an amount of about 0.001-1 wt % based on the total weight of the device adhesive film25. The device adhesive film25may include the gas blowing agent in an amount of about 0.001-1 wt % based on the total weight of the device adhesive film25.

Referring toFIGS.1,2B, and3B, the adhesive member20is primarily cured by being irradiated with first light L1of a first wavelength W1through the carrier substrate10(second operation, S20). Adhesive strength of the adhesive member20between the carrier substrate10and the device wafer30may be reinforced due to the primary curing.

In detail, the first light L1of the first wavelength W1is radiated to the adhesive member20through the carrier substrate10in a state in which the carrier substrate10and the device wafer30are bonded to each other with the adhesive member20therebetween. The gas blowing agent may be substantially insensitive to the light of the first wavelength W1so that it does not decompose and form gas upon exposure to light of the first wavelength. The first wavelength W1may be about 300 nm to about 349 nm, and the first light L1may be ultraviolet light. Accordingly, in the carrier adhesive film23and the device adhesive film25of the adhesive member20, a primary curing reaction may occur, in which the first light L1causes the first cross-linking agent and the second cross-linking agent to cross link the first resin and the second resin. In detail, due to the primary curing reaction, first polymer chains PB1of the first resin may be connected by first cross-linking groups BC1of the first cross-linking agent in the carrier adhesive film23. Furthermore, due to the primary curing reaction, second polymer chains PB2of the second resin may be connected by second cross-linking groups BC2of the second cross-linking agent in the device adhesive film25. Particles of the gas blowing agent GA may be dispersed between the second polymer chains PB2and the second cross-linking groups BC2in the device adhesive film25. Due to the primary curing reaction, modulus of the carrier adhesive film23and the device adhesive film25of the adhesive member20may increase, and the adhesive member20may securely fix the device wafer30to the carrier substrate10.

Referring toFIGS.1,2B,2C,3A, and3C, a back grinding process is performed on the device wafer30(third operation, S30). In detail, the back grinding process is performed in an overturned state in which the first surface30aof the device wafer30faces upwards (as shown inFIGS.2C and2D) so as to remove a portion of the wafer substrate30cadjacent to the first surface30aof the device wafer30(e.g., removal of a predetermined thickness of the wafer substrate30c). Accordingly, a portion of the wafer substrate30c, a portion of the via insulating film31, and a portion of the diffusion barrier film32may be removed, and the through substrate via35may be exposed. Here, the bezel part of edge region ER may also be removed. A sidewall of the insulating film31may be partially exposed by etching back a portion of the wafer substrate30c. The first surface30aof the of the device wafer30may change its configuration during the manufacturing process, such as after the back grinding process.

Referring toFIGS.2D and3D, a second passivation film39is formed on a back side of the wafer substrate30c. Furthermore, a second conductive pad41is formed in contact with the through substrate via35. Although not illustrated, a process of forming a bump or rewiring contacting the second conductive pad41may be performed as a follow-up process.

The device wafer30is separated from the carrier substrate10when an additional process is not required after performing a pad forming process and back grinding process on the first surface30aof the device wafer30. This will be described in detail with reference toFIGS.1,2E, and2F.

Referring toFIG.2E, the device wafer30to which the carrier substrate10is attached is placed on, for example, a chip bonding tape43. Here, the first surface30aof the device wafer30is brought into contact with the chip bonding tape43.

Referring toFIGS.1and2E, the adhesive member20is secondarily cured by being irradiated with second light L2of a second wavelength W2through the carrier substrate10(fourth operation, S40). Adhesive strength between the device wafer30and the adhesive member20may decrease due to the irradiation of the second light L2radiated during secondary curing.

In detail, the second light L2of the second wavelength W2is radiated to the adhesive member20through the carrier substrate10. The second wavelength W2may be different from the first wavelength W1of the first light L1ofFIG.2B. For example, the second wavelength W2may be greater than the first wavelength W1, such as the second wavelength W2being about 350 nm to about 400 nm. The second light L2may be ultraviolet light.

Referring toFIGS.2E,3B, and3E, the gas blowing agent GA included in the device adhesive film25may be decomposed, thus forming nitrogen (N2) gas and radicals RC. The radicals RC further cross link the second polymer chains PB2in the device adhesive film25so that internal bonds IC are formed between the second polymer chains and the radicals RC and so that the second polymer chains PB2are further bonded to each other though the radicals RC (e.g., increasing the cross-linking of the second polymer chains PB2). Accordingly, a secondary curing process progresses in the device adhesive film25, and this may be expressed by Chemical Reaction Formula 2.

In Chemical Reaction Formula 2, diazirine that is the gas blowing agent may be decomposed to nitrogen (N2) gas and carbene that is a radical as shown in Chemical Reaction Formulas 1 and 2.

of Chemical Reaction Formula 2 may correspond to the second resin included in the device adhesive film25. In

of Chemical Reaction Formula 2, P may denote a functional group, and R′ may denote alkyl group, alkenyl group, or alkanyl group. The functional group may be a hydroxyl group, carboxyl group, or the like. The carbene is bonded to the second polymer chains PB2of the second resin. That is, the carbene may form a new C—C bond by reacting with carbon and/or hydrogen of the second resin.

Therefore, a cross-linking degree/curing degree of the device adhesive film25may further increase, and thus the modulus of the device adhesive film25may increase, the adhesive film25stays together so that the entire adhesive film25is removed with removal of the carrier substrate10. Furthermore, the nitrogen gas may form pores AG (gaps filled with nitrogen gas, which may also be referred to herein as airgaps) between the device adhesive film25and the device wafer30, and thus the adhesive strength between the device adhesive film25and the device wafer30may be reduced. As shown inFIG.3E, the pores AG may be formed along the second surface30bof the device wafer30, and thus the pores AG may reduce the surface area of second surface30bthat is in contact with device adhesive film25. Accordingly, the adhesive strength between the adhesive member20and the device wafer30may be reduced.

On the contrary, since the carrier adhesive film23does not include the gas blowing agent GA, Chemical Reaction Formulas 1 and 2 do not occur in the the carrier adhesive film23. Therefore, the secondary curing process does not occur in the carrier adhesive film23. Therefore, adhesive strength between the carrier adhesive film23and the carrier substrate10is not reduced.

Referring toFIGS.1and2F, the adhesive member20and the carrier substrate10are separated from the device wafer30(fifth operation, S50). As described above, since the adhesive strength between the adhesive member20and the device wafer30has been reduced, the adhesive member20and the carrier substrate10may be easily separated from the device wafer30. Accordingly, a crack does not occur in the device wafer30. Furthermore, the combination of the carrier substrate and the adhesive member may be removed together with this separation step (S50) (the carrier substrate and the adhesive member are attached to each other during and immediately after separating from the device wafer) improving the speed of this peel-off process.

As semiconductor devices are decreased in size, a thickness of the device wafer30is decreased, and thus the device wafer30may be more vulnerable to a crack. However, a crack or edge chipping of the device wafer30or tearing of a passivation film may be minimized/prevented by using a semiconductor device manufacturing method according to the inventive concept. Accordingly, yield may be improved since the device wafer30does not break. Furthermore, accordingly, a speed of a separation process or peel-off process may be improved, and thus the yield may be further improved.

Referring toFIG.2Gnext, the chip regions CR (and the semiconductor devices formed in the chip regions CR) are separated from each other by cutting the wafer along the scribe regions SR, such as by performing a sawing process or other singulation process, thus forming a plurality of semiconductor chips. In some examples, if not formed previously, the first conductive bumps38may be attached to the first conductive pads to the device wafer30prior to the chip region CR separation (e.g., to structure corresponding to that shown inFIG.2F) or after chip region CR separation (e.g., to structure corresponding to that shown inFIG.2G). Referring toFIG.2H, the separated chip regions CR are mounted on a package substrate50in a flip chip bonding manner, for example. The package substrate50may be a printed circuit board or rewiring substrate. The chip region CR may form a first semiconductor chip CR. A second semiconductor chip54is mounted on the first semiconductor chip CR in a flip chip bonding manner using an internal solder balls47. A mold film58covering the first semiconductor chip CR and the second semiconductor chip54is formed by performing a mold process. Furthermore, a semiconductor package100is formed by attaching an external solder ball52to a lower portion of the package substrate50. Although a single first semiconductor chip CR is illustrated inFIG.2G, several such first semiconductor chips CR may be provided, such as by being stacked between the package substrate50and the second semiconductor chip54.

FIG.4is a cross-sectional view illustrating a method for manufacturing a semiconductor device according to embodiments of the inventive concept.

Referring toFIG.4, an adhesive member20amay further include a first adhesive auxiliary film27and a second adhesive auxiliary film29in the structure of the adhesive member20ofFIG.2A. The first adhesive auxiliary film27may be disposed between the base film21and the carrier adhesive film23, and may improve adhesive strength between the base film21and the carrier adhesive film23. The second adhesive auxiliary film29may be disposed between the base film21and the device adhesive film25, and may improve adhesive strength between the base film21and the device adhesive film25. The first adhesive auxiliary film27may include the first resin, the first cross-linking agent, and the first filler, that are described above with reference toFIG.2A. The first adhesive auxiliary film27may not include the first release agent and the gas blowing agent, as described above with reference toFIG.2A. The second adhesive auxiliary film29may include the second resin, the second cross-linking agent, and the second filler, as described above with reference toFIG.2A. The second adhesive auxiliary film29may not include the second release agent and the gas blowing agent, as described above with reference toFIG.2A.

After bonding as illustrated inFIG.4, processes may be performed as described above with reference toFIGS.1,2A to2H, and3A to3E. The first adhesive auxiliary film27and the second adhesive auxiliary film29may also be cured in the primary curing operation (second operation, S20) ofFIG.1, thus increasing their adhesive strength. However, in the secondary curing operation (fourth operation, S40) ofFIG.1, the first adhesive auxiliary film27and the second adhesive auxiliary film29may not be further cured, and there may be no change in adhesive strength of the first and second auxiliary films27,29. Other matters may be the same as or similar to the above descriptions.

FIG.5is a cross-sectional view illustrating a method for manufacturing a semiconductor device according to embodiments of the inventive concept.

Referring toFIG.5, an adhesive member20bmay not include the base film21in the structure of the adhesive member20ofFIG.2A. The adhesive member20bmay include the device adhesive film25and the carrier adhesive film23, which are sequentially laminated. In this case, sequentially coating the device adhesive film25and the carrier adhesive film23on the device wafer30may be added before the bonding (first operation, S10) of the carrier substrate10onto the device wafer30with the adhesive member20btherebetween. Thereafter, processes may be performed as described above with reference toFIGS.1,2A to2H, and3A to3E. Other matters may be the same as or similar to the above descriptions.

FIG.6is a cross-sectional view illustrating a method for manufacturing a semiconductor device according to embodiments of the inventive concept.

Referring toFIG.6, an adhesive member20cis formed as a single-layer adhesive film. The adhesive member20caccording to the present example may not include the base film21nore the carrier adhesive film23in the structure of the adhesive member20ofFIG.2A. That is, the adhesive member20caccording to the present example may have the same components and composition as the device adhesive film25described above with reference toFIG.2A. That is, the adhesive member20cmay include a resin, the second cross-linking agent, the second filler, the second release agent, and the gas blowing agent. In this case, coating the adhesive member20con the device wafer30may be added before the bonding (first operation, S10) of the carrier substrate10onto the device wafer30with the adhesive member20ctherebetween. Thereafter, processes may be performed as described above with reference toFIGS.1,2A to2H, and3A to3E. The adhesive member20cmay be disposed between and directly contact the device wafer30and the carrier substrate10. In the present example, the adhesive member20cis primarily cured in the second operation (S20), and after the back grinding process (third operation, S30) and the pad forming process, the adhesive member20cis secondarily cured in the fourth operation (S40), and thus has reduced adhesive strength and may be separated from the device wafer30without causing a crack (fifth operation, S50). Other matters may be the same as or similar to the above descriptions.

FIG.7is an enlarged view of the portion P2ofFIG.2Baccording to embodiments of the inventive concept.

Referring toFIG.7, the base film21may be a multi-layer film comprising several films having different Young's modulus, toughness, and elongation. In a specific example, the base film21of an adhesive member20dmay include first to third base films21a,21b, and21csequentially laminated. The first to third base films21a,21b, and21cmay have different Young's modulus, toughness, and elongation. Accordingly, the WSS process may be performed more stably. Other configurations and methods may be the same as or similar to the above descriptions of embodiments including a base film21.

In a method for manufacturing a semiconductor device according to an embodiment of the inventive concept, an adhesive member includes a gas blowing agent, which is decomposed by light of a specific wavelength to form nitrogen gas and radicals. Therefore, when separating the adhesive member and a carrier substrate from a device wafer, adhesive strength of the adhesive member is decreased and pores are formed between the adhesive member and the device wafer by irradiating the adhesive member with light of a specific wavelength, and thus the separation process may be performed smoothly without causing a crack in the device wafer. Therefore, the yield may be improved.