Chemical vapor deposition device capable of reciprocating rotation and lifting

A chemical vapor deposition device capable of reciprocating rotation and lifting is provided. The chemical vapor deposition device includes a cavity, a base, a fixing bracket, a lifting mechanism, and a rotation mechanism. The present disclosure utilizes the principle of magnetic-fluid sealing to achieve device sealing and integrates the rotation and lifting functions, satisfying the coordinated work of reciprocating rotation, lifting movement, wafer heating, etc. at the same time without affecting each other. Moreover, the problem of physical entanglement and damage of electrical wires during the rotation process has been avoided, and micro-particles formed in the cavity will not affect the rotation mechanism, thereby enabling the efficient and stable operation of the rotation mechanism. The present disclosure has fewer transmission components, which reduces instability and mechanical wear caused by redundant components, improves the accuracy and stability of lifting and rotation control, and minimizes manufacturing costs and power consumption.

FIELD OF THE INVENTION

The present disclosure belongs to the field of semiconductor high-end manufacturing devices, and relates to an optimized chemical vapor deposition device capable of reciprocating rotation and lifting.

BACKGROUND OF THE INVENTION

The vacuum degree and film deposition uniformity inside the reaction chamber are critical for chemical vapor deposition (CVD) devices. While there are design schemes that independently utilize rotation devices and independently employ lifting devices to improve film uniformity, these schemes are not the best option for CVD devices considering manufacturing cost, power consumption, and operational stability. The main reasons are as follows: (1) CVD devices require a certain degree of vacuum tightness, but the requirements are not as high as those for physical vapor deposition (PVD), as dictated by the pressure inside the chamber, so the design schemes suitable for PVD are more complex and expensive, and have high power consumption; (2) CVD devices need to solve problems such as rotation, lifting, winding of electrical wires, and electromagnetic interference at the same time; (3) there are too many transmission components in the existing design schemes of CVD devices, resulting in undesirable stability.

SUMMARY OF THE INVENTION

In view of the above-mentioned disadvantages of the related technology, the present disclosure provides a chemical vapor deposition device capable of reciprocating rotation and lifting for solving problems in the related technology.

The chemical vapor deposition device capable of reciprocating rotation and lifting includes:a cavity, provided with a through hole on a bottom of the cavity;a base, including a base station and a base shaft, wherein the base station is located in the cavity, the base shaft is located below the base station and fixedly connected with the base station, and a bottom end of the base shaft passes through the through hole to extend out of the cavity;a fixing bracket, located below the cavity and fixedly connected with the bottom of the cavity;a lifting mechanism, located below the cavity and connected with the fixing bracket, wherein the lifting mechanism includes a lifting bracket; anda rotation mechanism, configured to be located below the cavity and include a stator, a rotor, a driven piece, a connector, a magnetic-liquid sealing member, a magnetic liquid and a telescopic tubular assembly; wherein the stator is fixedly connected with the lifting bracket and sleeved on a periphery of the rotor to drive the rotor to rotate with the base shaft as a rotation axis; wherein the driven piece is located above the rotor and fixedly connected with the rotor, and the driven piece is sleeved on a periphery of the base shaft and fixedly connected with the base shaft; wherein the telescopic tubular assembly is located above the driven piece and sleeved on the periphery of the base shaft, a top of the telescopic tubular assembly is hermetically connected with the bottom of the cavity, and a bottom of the telescopic tubular assembly is hermetically connected with a top of the connector; wherein the magnetic-liquid sealing member is sleeved on a periphery of the driven piece and forms a magnetic-liquid containing space with an outer-side wall of the driven piece; wherein the magnetic liquid is located in the magnetic-liquid containing space, a top of the magnetic-liquid sealing member is hermetically connected with a bottom of the connector, and a bottom of the magnetic-liquid sealing member is hermetically connected with a top of the lifting bracket.

Optionally, the lifting mechanism further includes a driving motor, a reducer, a threaded rod and a threaded block. The driving motor, the reducer and the threaded rod are sequentially connected from bottom to top. The reducer is fixedly connected with the fixing bracket, the threaded rod is driven by the reducer to rotate, and the threaded block is sleeved on a periphery of the threaded rod and is configured to move up or down along with the rotation of the threaded rod. A side surface of the fixing bracket is provided with a guide-rail groove, a first side of the threaded block is embedded into the guide-rail groove, and a second side of the threaded block is fixedly connected with the lifting bracket to drive the lifting bracket to move up or down.

Optionally, the fixing bracket includes a supporting portion and a guide-rail block. A top end of the supporting portion is fixedly connected with the bottom of the cavity, and the guide-rail block is located at a side surface of the supporting portion and fixedly connected with the supporting portion. A top end of the reducer is fixedly connected with a bottom end of the guide-rail block, and the guide-rail groove is open from a side of the guide-rail block away from the supporting portion.

Optionally, the telescopic tubular assembly includes a first fixing member, a corrugated pipe and a second fixing member. A top end of the corrugated pipe is fixedly connected with the first fixing member, a bottom end of the corrugated pipe is fixedly connected with the second fixing member, and the first fixing member is hermetically connected with the bottom of the cavity.

Optionally, the rotation mechanism further includes a blowing device, an outer-side surface of the connector is provided with an air inlet connected with the blowing device, an annular air channel communicating with the air inlet is embedded in the connector, and a plurality of air outlets is formed in a bottom of the annular air channel. A vertical distance between the air outlets and the base shaft is smaller than a vertical distance between the outer-side wall of the driven piece and the base shaft.

Optionally, the bottom of the connector is provided with a sliding groove, and a top end of the driven piece extends into the sliding groove and is slidably connected with the connector.

Optionally, the rotation mechanism further includes a filter and an opening sealing member. A top end of the filter extends into the rotor, a top of the opening sealing member is connected with a top of the rotor and covers a top opening of the rotor, and a bottom of the opening sealing member is connected with a top of the filter and covers a top opening of the filter. The opening sealing member is provided with an electrical wire hole allowing at least one electrical wire to pass through, a first end of the electrical wire is connected with the base station, and a second end of the electrical wire passes through the electrical wire hole and extends to the outside through the filter.

Optionally, the stator includes a core and a coil, and the coil is located between the core and the rotor.

Optionally, the chemical vapor deposition device further includes one or more auxiliary brackets, and each auxiliary bracket includes a supporting rod, a sliding shaft and a sliding member. A top end of the supporting rod is fixedly connected with the bottom of the cavity, the supporting rod includes a first extending side wing and a second extending side wing which are arranged at intervals from bottom to top, a bottom end of the sliding shaft is fixedly connected with the first extending side wing, and a top end of the sliding shaft is fixedly connected with the second extending side wing. The sliding member is connected with the lifting bracket and sleeved on a periphery of the sliding shaft and is configured to move up or down along the sliding shaft.

Optionally, the lifting bracket is provided with at least one perforation allowing the sliding shaft to pass through.

As described above, the present disclosure utilizes the principle of magnetic-fluid sealing to achieve device sealing and integrates the rotation and lifting functions. It can satisfy the coordinated work of reciprocating rotation, lifting movement, wafer heating, etc. at the same time without affecting each other. Moreover, by reciprocating rotation, it is also possible to avoid the problem of physical entanglement and damage of electrical wires during the rotation process. In addition, one blowing device can be set in the rotation mechanism to avoid the influence of micro-particles formed in the cavity on the rotation mechanism (or magnetic liquid), enabling the efficient and stable operation of the rotation mechanism. Compared to existing devices, the overall structure of the chemical vapor deposition device of the present disclosure has fewer transmission components, which reduces instability and mechanical wear caused by redundant components. This improves the accuracy and stability of lifting and rotation control, while also lowering manufacturing costs and power consumption.

REFERENCE NUMERALS

DETAILED DESCRIPTION OF THE INVENTION

The embodiments of the present disclosure will be described below. Those skilled can easily understand disclosure advantages and effects of the present disclosure according to contents disclosed by the specification. The present disclosure can also be implemented or applied through other different exemplary embodiments. Various modifications or changes can also be made to all details in the specification based on different points of view and applications without departing from the spirit of the present disclosure.

Refer toFIGS.1-9. It needs to be stated that the drawings provided in the following embodiments are just used for schematically describing the basic concept of the present disclosure, thus only illustrating components only related to the present disclosure and are not drawn according to the numbers, shapes and sizes of components during actual implementation, the configuration, number and scale of each component during actual implementation thereof may be freely changed, and the component layout configuration thereof may be more complex.

The present disclosure provides a chemical vapor deposition device capable of reciprocating rotation and lifting. Please refer toFIGS.1and2, which show a schematic perspective view and a schematic cross-sectional view of the chemical vapor deposition device, respectively. The chemical vapor deposition device includes a cavity100, a base200, a fixing bracket300, a lifting mechanism400, and a rotation mechanism500.

Specifically, please refer toFIG.3, which shows a schematic perspective view of the cavity100. A through hole101is disposed at a bottom of the cavity100.

Specifically, please refer toFIG.4, which shows a schematic perspective view of the base200. The base200includes a base station201and a base shaft202. The base station201is located in the cavity100, the base shaft202is located below the base station201and fixedly connected with the base station201, and a bottom end of the base shaft202passes through the through hole101to extend out of the cavity100.

As an example, the base shaft202is fixedly connected with a center position of a lower surface of the base station201. The base station201includes a heating member (not shown), the interior of the base shaft202is hollow and allows an electrical wire connected with the heating member to pass through, and the electrical wire is configured to supply power to the base station201and other related devices.

Specifically, as shown inFIGS.1and2, the fixing bracket300is located below the cavity100and fixedly connected with a bottom of the cavity100.

As an example, please refer toFIG.5, which shows a schematic perspective view of the fixing bracket300. The fixing bracket300includes a supporting portion302and a guide-rail block303. A top end of the supporting portion302is fixedly connected with the bottom of the cavity100, and the guide-rail block303is located at a side surface of the supporting portion302and fixedly connected with the supporting portion302. In one embodiment, a side surface of the fixing bracket300is provided with a guide-rail groove301, and the guide-rail groove301is open from a surface of the guide-rail block303facing away from the supporting portion302.

Specifically, as shown inFIGS.1and2, the lifting mechanism400is located below the cavity100and connected with the fixing bracket300. The lifting mechanism400includes a lifting bracket401, and the lifting bracket401is fixedly connected with the rotation mechanism500to drive the rotation mechanism500to move up or down.

As an example, as shown inFIGS.1and2, the chemical vapor deposition device further includes one or more auxiliary brackets600. Please refer toFIG.6, which shows a schematic perspective view of the auxiliary bracket600. The auxiliary bracket600includes a supporting rod601, a sliding shaft602and a sliding member603. A top end of the supporting rod601is fixedly connected with the bottom of the cavity100. The supporting rod601includes a first extending side wing601aand a second extending side wing602b, which are arranged at intervals from bottom to top. A bottom end of the sliding shaft602is fixedly connected with the first extending side wing601a, and a top end of the sliding shaft602is fixedly connected with the second extending side wing601b. The sliding member603is connected with the lifting bracket401and sleeved on a periphery of the sliding shaft602and is configured to move up or down along the sliding shaft602. In one embodiment, the lifting bracket401is provided with at least one perforation401aallowing one or more sliding shafts602to pass through, respectively (seeFIG.7).

As an example, the chemical vapor deposition device has two auxiliary brackets600, and the fixing bracket300and the two auxiliary brackets600are uniformly distributed around the base shaft202, and form a stable triangular structure, thereby improving the supporting stability of the lifting bracket401to the rotation mechanism500.

As an example, please refer toFIG.7, which shows a schematic perspective view of the lifting mechanism400. The lifting mechanism400further includes a driving motor402, a reducer403, a threaded rod404and a threaded block405. The driving motor402, the reducer403and the threaded rod404are sequentially connected from bottom to top.

Specifically, as shown inFIGS.1,2and7, the reducer403is fixedly connected with the fixing bracket300, the threaded rod404is driven by the reducer403to rotate, and the threaded block405is sleeved on a periphery of the threaded rod404and is configured to move up or down along with the rotation of the threaded rod404. A first side of the threaded block405is embedded into the guide-rail groove301of the fixing bracket300to enable the threaded block405to move up or down smoothly, and a second side of the threaded block405is fixedly connected with the lifting bracket401to drive the lifting bracket401to move up or down, thereby driving the rotation mechanism500to ascend and descend.

As an example, a top end of the reducer403is fixedly connected with a bottom end of the guide-rail block303of the fixing bracket300, enabling a steady reduction in the speed of the driving motor402. The driving motor402may be a servo motor.

Specifically, as shown inFIGS.1and2, the rotation mechanism500is located below the cavity100. Please refer toFIG.8, which shows a schematic cross-sectional view of the rotation mechanism500. The rotation mechanism500includes a stator501, a rotor502, a driven piece503, a connector504, a magnetic-liquid sealing member505, a magnetic liquid506, and a telescopic tubular assembly507.

Specifically, as shown inFIGS.1,2and8, the stator501is fixedly connected with the lifting bracket401and sleeved on a periphery of the rotor502to drive the rotor502to rotate with the base shaft202as a rotation axis. The driven piece503is located above the rotor502and fixedly connected with the rotor502, the driven piece503is sleeved on a periphery of the base shaft202and fixedly connected with the base shaft202, and the telescopic tubular assembly507is located above the driving member503and sleeved on the periphery of the base shaft202. A top of the telescopic tubular assembly507is hermetically connected with the bottom of the cavity100, and a bottom of the telescopic tubular assembly507is hermetically connected with a top of the connector504. The magnetic-liquid sealing member505is sleeved on a periphery of the driven piece503and forms a magnetic-liquid containing space along with an outer-side wall of the driven piece503. The magnetic liquid506is located in the magnetic-liquid containing space. A top of the magnetic-liquid sealing member505is hermetically connected with a bottom of the connector504, and a bottom of the magnetic-liquid sealing member505is hermetically connected with a top of the lifting bracket401.

As an example, a top of the stator501is fixedly connected with the lifting bracket401.

As an example, the stator501includes a core501aand a coil501b, and the coil501bis located between the core501aand the rotor502. The rotor502rotates with the base shaft202as a rotation axis under the influence of a magnetic field generated by the core501aand the coil501b. This rotation drives the driven piece503to rotate, which in turn rotates the base shaft202.

As an example, the rotation mode of the rotor502is reciprocating rotation, so that the problem of physical entanglement and damage of electrical wires during the rotation process can be avoided.

As an example, the bottom of the connector504may be provided with a sliding groove (not shown), and a top end of the driven piece503may extend into the sliding groove and be slidably connected with the connector504to enhance the rotation stability of the driven piece503.

Specifically, since the driven piece503needs to rotate, room for movement needs to be reserved between the top end of the driven piece503and the connector504. In order to achieve sealing of the top area of the driven piece503, the principle of magnetic-fluid sealing is utilized, that is, the magnetic-liquid sealing member505and the magnetic liquid506are used for sealing the top area.

It should be noted that physical vapor deposition (PVD) requires a very high pressure in the cavity and a very high sealing degree, which necessitates the use of a physical isolation seal to meet the conditions. One such method of sealing is magnetic coupling. The magnetic-liquid sealing of the present disclosure is different from the sealing principle driven by magnetic coupling. It can meet the sealing requirements of chemical vapor deposition (CVD) devices, which do not require too much high-vacuum sealing. Additionally, it simplifies transmission components, reducing instability and mechanical wear caused by redundant components. This results in higher accuracy and stability of lifting and rotation control, and lower manufacturing cost and power consumption.

Specifically, the magnetic liquid506is adsorbed onto an inner surface of the magnetic-liquid sealing member505and an outer surface of the driven piece503. When the driven piece503rotates, the magnetic liquid still maintains the adsorbed state and isolates the internal space of the driven piece503from the outside.

As an example, the magnetic-liquid sealing member505is fixedly connected with the connector504via fasteners, and a sealing ring is provided between the top of the magnetic-liquid sealing member505and the bottom of the connector504to achieve sealing at the interface. The magnetic-liquid sealing member505is fixedly connected with the lifting bracket401via fasteners, and a sealing ring is provided between the bottom of the magnetic-liquid sealing member505and the top of the lifting bracket401to achieve sealing at the interface.

As an example, the telescopic tubular assembly507includes a first fixing member507a, a corrugated pipe507band a second fixing member507c. A top end of the corrugated pipe507bis fixedly connected with the first fixing member507a, a bottom end of the corrugated pipe507bis fixedly connected with the second fixing member507c, and the first fixing member507ais hermetically connected with the bottom of the cavity100.

As an example, the first fixing member507aand the cavity100are fixed by fasteners, and a sealing ring is provided between a top surface of the first fixing member507aand a bottom surface of the cavity100to achieve sealing at the interface.

As an example, as shown inFIG.8, the rotation mechanism500further includes a blowing device508, an outer-side surface of the connector504is provided with an air inlet509connected with the blowing device508, an annular air channel510communicating with the air inlet509is embedded in the connector504, and a plurality of air outlets511is formed in a bottom of the annular air channel510. A vertical distance between the air outlets511and the base shaft202is smaller than a vertical distance between the outer-side wall of the driven piece503and the base shaft202.

As an example, the plurality of air outlets511is uniformly distributed on the circumference of the annular air channel510.

Specifically, the blowing device508continuously blows air into the interior of the connector504through a blowing pipe. Please refer toFIG.9, which shows an enlarged view of an elliptic area ofFIG.8. The arrows indicate airflow. The airflow can prevent particles generated during chemical vapor deposition in the cavity100from falling into the magnetic liquid in the rotation mechanism500, maintaining the sealing effect of the magnetic liquid.

As shown inFIGS.1,2and8, the rotation mechanism500further includes a filter512and an opening sealing member513. A top end of the filter512extends into the rotor502, a top of the opening sealing member513is connected with a top of the rotor502and covers a top opening of the rotor502, and a bottom of the opening sealing member513is connected with a top of the filter512and covers a top opening of the filter512. The opening sealing member513is provided with an electrical wire hole allowing at least one electrical wire to pass through, a first end of each electrical wire is connected with the base station201, and a second end of the electrical wire passes through the electrical wire hole and extends to the outside through the filter512.

Specifically, the filter512may filter electromagnetic waves transmitted from the base station201to the electrical wire, so as to avoid electromagnetic waves interfering with external power lines, thereby ensuring a stable power supply to the base station201.

Specifically, the base station201performs reciprocating rotation, lifting movement, and wafer heating at the same time. Specifically, the lifting bracket401of the lifting mechanism400moves up and down along with the threaded block405and drives the rotation mechanism500to ascend and descend. The rotor502of the rotation mechanism500rotates with the base shaft202as a rotation axis while lifting, which drives the driven piece503to lift and rotate. Subsequently, the base shaft202and the base station201are brought into lifting and rotation movement in turn. In the rising process of the base shaft202, the telescopic tubular assembly507is shortened, and in the descending process of the base shaft202, the telescopic tubular assembly507extends. The electrical wires in the base shaft202power the heating of the base station201, and the electrical wires perform reciprocating rotational motion along with the base station201without physical entanglement damage.

In summary, the present disclosure utilizes the principle of magnetic-fluid sealing to achieve device sealing and integrates the rotation and lifting functions. It can satisfy the coordinated work of reciprocating rotation, lifting movement, wafer heating, etc. at the same time without affecting each other. Moreover, by reciprocating rotation, it is also possible to avoid the problem of physical entanglement and damage of electrical wires during the rotation process. In addition, one blowing device can be set in the rotation mechanism to avoid the influence of micro-particles formed in the cavity on the rotation mechanism (or magnetic liquid), enabling the efficient and stable operation of the rotation mechanism. Compared to existing devices, the overall structure of the chemical vapor deposition device of the present disclosure has fewer transmission components, which reduces instability and mechanical wear caused by redundant components. This improves the accuracy and stability of lifting and rotation control, while also lowering manufacturing costs and power consumption. Therefore, the present disclosure effectively overcomes various shortcomings in the existing technology and has high industrial utilization value.

The above-mentioned embodiments are just for describing the principle and effects of the present disclosure instead of limiting the present disclosure. Those skilled in the art can make modifications or changes to the above-mentioned embodiments without going against the spirit and the range of the present disclosure. Therefore, all equivalent modifications or changes made by those who have common knowledge in the art without departing from the spirit and technical concept disclosed by the present disclosure shall be still covered by the scope of the present disclosure.