CN1243286C - Method for producing polymer light wave guide device based on silicon lining - Google Patents

Method for producing polymer light wave guide device based on silicon lining Download PDF

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CN1243286C
CN1243286C CN 200410053794 CN200410053794A CN1243286C CN 1243286 C CN1243286 C CN 1243286C CN 200410053794 CN200410053794 CN 200410053794 CN 200410053794 A CN200410053794 A CN 200410053794A CN 1243286 C CN1243286 C CN 1243286C
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sio
layer
corrosion
oxygen oxidation
minute
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CN1588233A (en
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李锡华
王明华
江晓清
周强
杨建义
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The present invention discloses a method for making a polymer optical waveguide device based on a silicon lining. The method comprises the following steps: 1. using an oxidation process to grow a SiO2 thin layer on the surface of the Si lining as a Si-corrosion mask; 2. using the SiO2 as the mask to corrode the Si lining; 3. growing thicker SiO2 as a lower limiting layer; 4. making a polymer core layer and grinding surplus parts; 5. making a polymer upper limiting layer. The present invention has the advantages of simple manufacturing process, low production cost and high efficiency. Only some conventional semiconductor devices and conventional processes are used, and complex and expensive devices and complex and highly difficult techniques are not needed. The method is compatible with IC process, and is favorable to realize the integration of photoelectric devices.

Description

Method for making based on the polymer optical waveguide device of silicon substrate
Technical field
The present invention relates to method for making, relate in particular to a kind of method for making of the polymer optical waveguide device based on silicon substrate based on the type of the burying polymer optical waveguide device of silicon substrate.
Background technology
At present fiber waveguide device as: light source/receiver (detector), modulator/demodulator, Wavelength division multiplexer/demultiplexer, photoswitch/optical power distributor, image intensifer/attenuator, optical filter, interferometer etc. all occupy critical role in optical-fiber network.Employed material has a lot, and they realize one or more above-mentioned devices with different structure and principle.These materials mainly comprise III-V group iii v compound semiconductor material, LiNbO 3Material, SOI (silicon on isolator), Si, SiO 2, organic polymer etc.
Wherein utilize Si to have technical maturity, easy advantage such as integrated, and be easy to utilize oxidation technology on Si, to make one deck SiO as backing material 2Make the lower limit layer material.Organic polymer as the fiber waveguide device material have that structure is flexible, technology is simple, low cost and other advantages, and has characteristics such as bigger negative thermo-optical coeffecient, lower heat-conduction coefficient and absorption loss.And, utilize Si to be backing material, make the technology and the microelectronic technique compatibility of the polymer optical waveguide device of the type of burying, the cost of material is low, is with a wide range of applications.
Summary of the invention
The purpose of this invention is to provide a kind of method for making of the polymer optical waveguide device based on silicon substrate, be based on the Si backing material, with SiO 2Be lower limit layer, polymkeric substance is the waveguide device method for making technology of core material.
The technical solution adopted for the present invention to solve the technical problems is to comprise the steps:
1. based on the method for making of the polymer optical waveguide device of silicon substrate, it is characterized in that comprising the steps:
1) utilizes oxidation technology one deck SiO that on the Si substrate surface, grows 2Thin layer is as the Si corrosion mask:
For oxidation one deck SiO on the Si sheet of cleaning 2Thin layer, in the high-temperature oxydation stove, adopting oxidizing condition is 1100 ℃-1150 ℃ of temperature, oxygen gas flow rate is 800-1500ml/min, first dry-oxygen oxidation 15-30 minute; Wet-oxygen oxidation 20-40 minute then, bath temperature 80-95 ℃; Once more after dry-oxygen oxidation 15-30 minute, obtain the SiO that thickness is about 200nm at last 2Thin layer;
2) with SiO 2Thin layer is a mask corrosion Si substrate:
In order on silicon chip, to etch the waveguide region of designing requirement shape, at first must be the SiO on the etch areas 2Thin layer is removed, and this work is finished by photoetching process;
After the photoetching, in order to remove the SiO of waveguide region 2Thin layer need use etching process;
Utilize photoresist to make mask corrosion SiO 2The corrosive liquid proportioning be HF: NH 4F: H 2O=3: 6: 9, at SiO 2On obtain the figure of waveguide, remove photoresist after the corrosion;
Utilize SiO again 2Thin layer is made mask corrosion Si, and the mordant of Si has a variety of, is that the corrosive liquid proportioning is KOH: H 2O=1: 1, etching condition: bath temperature 50-70 ℃, be determined by experiment corrosion rate and be about 0.1 μ m/ minute, owing to can residually corrosive liquid be arranged after the corrosion usually, can continue corrosion to its surface, the infringement silicon face at silicon face, therefore after finishing, corrosion also to handle silicon face, principal ingredient at residual corrosive liquid is a potassium hydroxide, adopts the method for soaking in watery hydrochloric acid, rinses well with deionized water then;
More than 1), 2) two the step also can directly after photoetching on the Si substrate, make mask with photoresist, etch the waveguide region of designing requirement shape with RIE or ICP dry etching method;
3) the thicker SiO of growth 2Lower limit layer:
In order to form lower limit layer, suppress to leak into the light field in the silicon substrate of high index, so on the silicon chip of the waveguide region that etches the designing requirement shape the thicker SiO of growth one deck 2As SiO 2Lower limit layer, still adopt method that dry-oxygen oxidation and wet-oxygen oxidation the hocket silicon dioxide layer of growing, oxidizing temperature remains on 1100-1200 ℃, elder generation's dry-oxygen oxidation 20-40 minute, wet-oxygen oxidation and dry-oxygen oxidation hocket 6 times then, wherein wet-oxygen oxidation 50-70 minute, dry-oxygen oxidation 20-40 minute.Be 50-70 minute dry-oxygen oxidation at last;
4) make core polymer layer, and grind redundance:
On sol evenning machine, adopt to revolve and get rid of technology and obtain the polymer waveguide part;
At first, will handle the good silicon dioxide laminar surface of growing, purpose is the adhesive capacity that increases between silicon dioxide laminar surface and the organic matter layer, prevents that organism from producing shrinkage phenomenon when film forming, and method is: earlier at dense H 2SO 4Soaked 4~6 hours, rinse well with deionized water, in isopropyl alcohol, soaked again 6~8 hours, rinse well with deionized water, the defective of polymer film was few when rotating speed was high when sparing glue, but film can be thinner, when rotating speed hangs down (<2000rpm) the polymkeric substance membrane thickness unevenness is comparatively obvious, so will carry out balance;
This moment, core layer polymer was not only filled with SiO 2Waveguide groove district for lower limit layer also can form the skim plate part, constitutes the structure of ridged, in order to obtain the structure of the type of burying, needs unnecessary plate part is ground away, and the parameter during grinding is determined according to the concrete condition of plate part;
5) make the polymkeric substance upper limiting layer:
In order on core layer polymer, to generate upper limiting layer, need once more the even low slightly polymeric material of glue one deck refractive index, no matter be sandwich layer or covering polymkeric substance, all need after even being coated with to remove solvent in about 1~2 hour with 40-60 ℃ of heat preservation and dryness in a vacuum, take out then and in baking oven, slowly be warmed up to 90-120 ℃, be incubated 2 hours, slowly be warming up to 150-160 ℃ again, be incubated 1-1.5 hour.
The useful effect that the present invention has is: manufacture craft of the present invention is simple, only uses some conventional semiconductor equipment and common process, does not need cost and complex equipment and complicated high-leveled and difficult technology, and production cost is low, efficient is high.This method and IC process compatible help realizing the integrated of photoelectric device.
Description of drawings
Accompanying drawing is a manufacture craft process flow diagram of the present invention.
In the accompanying drawing: the 1st, Si substrate, 2 SiO 2Thin layer, the 3rd, SiO 2Lower limit layer, the 4th, core polymer layer, the 5th, polymkeric substance upper limiting layer.
Embodiment
As shown in Figure 1, be substrate, SiO in order to make one with Si 2Bury 1 * 2 power splitter of type for the polymkeric substance of lower limit layer, waveguide dimensions is 5 μ m * 5 μ m, and top covering thickness is 10 μ m, and it is as follows to make worker sesame step:
1) utilizes oxidation technology one deck SiO that on Si substrate 1 surface, grows 2 Thin layer 2 is as Si substrate 1 corrosion mask:
For the SiO that approaches at the Si substrate 1 oxidation one deck that cleans 2 Thin layer 2, in the high-temperature oxydation stove, adopting oxidizing condition is 1150 ℃ of temperature, oxygen gas flow rate is 1100ml/min, dry-oxygen oxidation 20 minutes, wet-oxygen oxidation 30 minutes (90 ℃ of bath temperatures), dry-oxygen oxidation obtained the thin SiO that thickness is about 200nm after 20 minutes once more 2Layer;
2) with SiO 2 Thin layer 2 is a mask corrosion Si substrate 1:
In order on silicon chip, to etch the waveguide region of Y branch shape, at first must be the SiO on the etch areas 2 Thin layer 2 is removed, and this work is finished by photoetching process;
After the photoetching, in order to remove the SiO of waveguide region 2 Thin layer 2 needs to use etching process;
Utilize photoresist to make mask corrosion SiO 2The corrosive liquid proportioning be HF: NH 4F: H 2O=3: 6: 9, at SiO 2Obtain the figure of waveguide on the thin layer 2, remove photoresist after the corrosion;
Utilize SiO again 2 Thin layer 2 is made mask corrosion Si substrate 1, and the mordant of Si has a variety of, is that the corrosive liquid proportioning is KOH: H 2O=1: 1, etching condition: 60 ℃ of bath temperatures, be determined by experiment corrosion rate and be about 0.1 μ m/ minute, owing to can residually corrosive liquid be arranged after the corrosion usually, can continue corrosion to its surface, the infringement silicon face at silicon face, therefore after finishing, corrosion also to handle silicon substrate 1 surface, principal ingredient at residual corrosive liquid is a potassium hydroxide, adopts the method for soaking in watery hydrochloric acid, rinses well with deionized water then;
3) the thicker SiO of growth 2Lower limit layer 3:
In order to form lower limit layer, suppress to leak into the light field in the silicon substrate of high index, so on the silicon substrate 1 of the waveguide region that etches Y branch the thicker SiO of growth one deck 2 Lower limit layer 3, still adopt method that dry-oxygen oxidation and wet-oxygen oxidation the hocket silicon dioxide layer of growing, oxidizing temperature remains on 1150 ℃, first dry-oxygen oxidation 30 minutes, wet-oxygen oxidation and dry-oxygen oxidation hocket 6 times then, wherein wet-oxygen oxidation 60 minutes, dry-oxygen oxidation 30 minutes.Be 60 minutes dry-oxygen oxidation at last;
4) make core polymer layer 4, and grind redundance:
On sol evenning machine, adopt to revolve and get rid of technology and obtain the polymer waveguide part;
At first, to the good SiO that grows 2 Lower limit layer 3 surfaces will be handled, and purpose is to increase SiO 2Adhesive capacity between lower limit layer 3 surfaces and the organic polymer layers prevents that organism from producing shrinkage phenomenon when film forming, and method is: earlier at dense H 2SO 4Soaked 4~6 hours, and rinsed well, in isopropyl alcohol, soaked again 6~8 hours, rinse well with deionized water with deionized water.Employing is revolved and is got rid of technology and obtain the polymer waveguide part, according to the difference of character such as polymkeric substance viscosity, selects even glue rotating speed.Generally remain on more than the 2000rpm.And use grinding technics to remove unnecessary core structure, obtain the sandwich layer of the 5 μ m degree of depth.
5) make polymkeric substance upper limiting layer 5:
Get rid of technology and obtain polymkeric substance upper limiting layer 5 with revolving at last, select even glue rotating speed, control polymkeric substance upper limiting layer 5 thickness are at 10 μ m.

Claims (1)

1. based on the method for making of the polymer optical waveguide device of silicon substrate, it is characterized in that comprising the steps:
1) utilizes oxidation technology one deck SiO that on Si substrate (1) surface, grows 2Thin layer (2) is as the Si corrosion mask:
For oxidation one deck SiO on the Si sheet of cleaning 2Thin layer (2), in the high-temperature oxydation stove, adopting oxidizing condition is 1100 ℃-1150 ℃ of temperature, oxygen gas flow rate is 800-1500ml/min, first dry-oxygen oxidation 15-30 minute; Wet-oxygen oxidation 20-40 minute then, bath temperature 80-95 ℃; Once more after dry-oxygen oxidation 15-30 minute, obtain the SiO that thickness is about 200nm at last 2Thin layer (2);
2) with SiO 2Thin layer (2) is a mask corrosion Si substrate (1):
In order on silicon chip, to etch the waveguide region of designing requirement shape, at first must be the SiO on the etch areas 2Thin layer (2) is removed, and this work is finished by photoetching process;
After the photoetching, in order to remove the SiO of waveguide region 2Thin layer (2) needs to use etching process;
Utilize photoresist to make mask corrosion SiO 2The corrosive liquid proportioning be HF: NH 4F: H 2O=3: 6: 9, at SiO 2On obtain the figure of waveguide, remove photoresist after the corrosion;
Utilize SiO again 2Thin layer (2) is made mask corrosion Si, and the corrosive liquid proportioning is KOH: H 2O=1: 1, etching condition: bath temperature 50-70 ℃, be determined by experiment corrosion rate and be about 0.1um/ minute, owing to can residually corrosive liquid be arranged after the corrosion usually, can continue corrosion to its surface, the infringement silicon face at silicon face, therefore after finishing, corrosion also to handle silicon face, principal ingredient at residual corrosive liquid is a potassium hydroxide, adopts the method for soaking in watery hydrochloric acid, rinses well with deionized water then;
3) the thicker SiO of growth 2Lower limit layer (3):
In order to form lower limit layer, suppress to leak into the light field in the silicon substrate of high index, so on the silicon chip of the waveguide region that etches the designing requirement shape the thicker SiO of growth one deck 2As SiO 2Lower limit layer (3), still adopt method that dry-oxygen oxidation and wet-oxygen oxidation the hocket silicon dioxide layer of growing, oxidizing temperature remains on 1100-1200 ℃, elder generation's dry-oxygen oxidation 20-40 minute, wet-oxygen oxidation and dry-oxygen oxidation hocket 6 times then, wherein wet-oxygen oxidation 50-70 minute, dry-oxygen oxidation 20-40 minute.Be 50-70 minute dry-oxygen oxidation at last;
4) make core polymer layer (4), and grind redundance:
On sol evenning machine, adopt to revolve and get rid of technology and obtain the polymer waveguide part;
At first, will handle the good silicon dioxide laminar surface of growing, purpose is the adhesive capacity that increases between silicon dioxide laminar surface and the organic matter layer, prevents that organism from producing shrinkage phenomenon when film forming, and method is: earlier at dense H 2SO 4Soaked 4~6 hours, and rinsed well, in isopropyl alcohol, soaked again 6~8 hours with deionized water, rinse well with deionized water, the defective of polymer film was few when rotating speed was high when sparing glue, but film can be thinner, rotating speed during less than 2000rpm the polymkeric substance membrane thickness unevenness comparatively obvious, so will carry out balance;
This moment, core layer polymer was not only filled with SiO 2Waveguide groove district for lower limit layer also can form the skim plate part, constitutes the structure of ridged, in order to obtain the structure of the type of burying, needs unnecessary plate part is ground away, and the parameter during grinding is determined according to the concrete condition of plate part;
5) make polymkeric substance upper limiting layer (5):
In order on core layer polymer, to generate upper limiting layer (5), need once more the even low slightly polymeric material of glue one deck refractive index, no matter be sandwich layer or covering polymkeric substance, all need after even being coated with in a vacuum with the 40-60 ℃ of about 1-2 of heat preservation and dryness hour removal solvent, take out then and in baking oven, slowly be warmed up to 90-120 ℃, be incubated 2 hours, slowly be warming up to 150-160 ℃ again, be incubated 1-1.5 hour.
CN 200410053794 2004-08-14 2004-08-14 Method for producing polymer light wave guide device based on silicon lining Expired - Fee Related CN1243286C (en)

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