Summary of the invention
Embodiments provide a kind of nickel positive mold method for making based on positive photoresist, solve that photoetching preparation efficiency is low, degumming process is difficult, the problem that edge tilts.
For achieving the above object, this application provides a kind of nickel positive mold method for making based on positive photoresist, described method comprises:
The even spin coating positive photoresist in the front of substrate;
Utilize the positive photoresist of negativity mask plate to described substrate of target pattern to expose, after development, obtain patterned photoresist; Wherein, after development, in the photoresist region of described exposure, described substrate is exposed;
Sputter chromium on the described substrate with described patterned photoresist, forms even layers of chrome pattern;
Described substrate is placed in respectively acetone, alcohol ultrasonic cleaning, in order to remove described patterned photoresist;
Tackifier hmds evaporation is carried out to described layers of chrome pattern, in order to strengthen the adhesiveness of described layers of chrome pattern and photoresist, and on described layers of chrome pattern even spin coating positive photoresist;
Utilize described layers of chrome pattern to expose the photoresist on the described layers of chrome pattern on described substrate, after development, obtain the photoresist of layers of chrome pattern;
Surface metalation is carried out to the photoresist of described layers of chrome pattern;
Carry out the electroforming of metallic nickel formpiston by the photoresist of micro-electroforming to the described layers of chrome pattern after metallization, obtain nickel positive mold.
Preferably, described exposure specifically for: the target pattern on described negativity mask plate is copied on described positive photoresist.
Preferably, described obtain patterned photoresist after, described method also comprises: the described substrate with described patterned photoresist is put into plasma cleaning cavity, carries out plasma cleaning, in order to remove the bottom of developing regional photoresist.
Preferably, it is characterized in that, on described layers of chrome pattern after even spin coating positive photoresist, also comprise: baking process is carried out to the positive photoresist of spin coating even on described layers of chrome pattern.
Preferably, the angle angle between the sidewall of the photoresist of described layers of chrome pattern and described substrate is not less than 90 degree.
Preferably, described angle angle was adjusted by the time of described exposure.
Preferably, the draft angle of described nickel positive mold is not more than 90 degree.
Preferably, described substrate is glass or quartz material.
The nickel positive mold method for making based on positive photoresist that the embodiment of the present invention provides, utilizes the positive photoresist of negativity mask plate to described substrate of target pattern to expose, after development, obtains patterned photoresist; Sputter chromium on the described substrate with described patterned photoresist, forms even layers of chrome pattern; Even spin coating positive photoresist on described layers of chrome pattern; Utilize described layers of chrome pattern to expose the photoresist on the described layers of chrome pattern on described substrate, after development, obtain the photoresist identical with above-mentioned layers of chrome pattern; Surface metalation is carried out to the photoresist of described layers of chrome pattern; Angle angle between the sidewall of the photoresist of layers of chrome pattern and described substrate is not less than 90 degree, makes metallized film uniformity and conducts electricity very well.Carry out the electroforming of metallic nickel formpiston by the photoresist of micro-electroforming to the described layers of chrome pattern after metallization, obtain nickel positive mold, the draft angle of nickel positive mold is not more than 90 degree, avoids nickel positive mold edge and tilts.The manufacture craft of nickel positive mold is easy in addition, removes photoresist conveniently.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
Below for the nickel positive mold method for making based on positive photoresist that Fig. 1 detailed description embodiment of the present invention provides, the nickel positive mold method for making process flow diagram based on positive photoresist that Fig. 1 provides for the embodiment of the present invention; The nickel positive mold method for making schematic flow sheet based on positive photoresist that Fig. 2 provides for the embodiment of the present invention; The nickel positive mold based on positive photoresist that Fig. 3 provides for the embodiment of the present invention makes scene schematic diagram.As shown in Figure 1,2 and 3, the method comprises the steps:
Step S101, in the front of substrate even spin coating positive photoresist;
Particularly, substrate can be glass or quartz material.Glass and quartz have excellent optical property, are conducive to using different chemical methodes to carry out surface modification to it, use fotoceram chemical etching technology microchannel directly can be processed on glass and quartz.
Photoresist is the key intermediary by photoetching technique, the microstructure on mask accurately being transferred to substrate.Photoresist has two kinds of fundamental types, and one is negative photoresist, and the polymkeric substance that cross-linking reaction forms more indissoluble before comparatively exposure occurs when exposing, and is fixed but not exposed portion is washed off after negative photoresist exposed portion development; Another kind is positive photoresist, and when exposing, polymkeric substance generation bond rupture is decomposed and becomes and more easily dissolve, and the exposed portion of positive optical cement is then washed off after development, and non-exposed part is fixed.Thus micro-fluidic chip layout on mask is transferred on photoresist layer.The feature of positive photoresist is that photoresist originally by some dissolution with solvents, when there is photolysis reactions by after suitable wavelength light irradiation, can not cut off resin polymers main chain and from the contact between chain, making it become solable matter.Therefore, when with positive glue photoetching, can obtain photoetching offset plate figure identical with reticle light-shielding pattern at substrate surface, positive photoresist resolution is higher, has better adhesiveness to some common metal surfaces.
Detailed process is fixed on a spinstand by substrate, and facing up of substrate, drops on substrate with glue head dropper by positive photoresist, and universal stage rotates and carries out whirl coating, and positive photoresist is evenly spin-coated on substrate.
Step S102, utilize the positive photoresist of negativity mask plate to described substrate of target pattern to expose, after development, obtain patterned photoresist; Wherein, after development, in the photoresist region of described exposure, described substrate is exposed;
Negativity mask plate will expose for there being the region of figure, wants printing opacity for not having the region of figure.
Described exposure specifically for: the target pattern on described negativity mask plate is copied on described positive photoresist.
Exposure can be contact exposure, proximity printing or projection exposure.The substrate applying positive photoresist is exposed, make exposed portion generation photochemical reaction and change its solubleness in developer solution, by development, show the figure corresponding to mask plate on a photoresist, obtain patterned photoresist, in the photoresist region of exposure, expose described substrate, concavely, there is the region of figure dented, do not have the region of figure constant.
Alternatively, described obtain patterned photoresist after, the described substrate with described patterned photoresist is put into plasma cleaning cavity, carries out plasma cleaning, in order to remove the bottom of developing regional photoresist.
The photoresist for shielding specifically is removed in primer process, obtains required litho pattern, and provides a clean surface for subsequent processing.Be conducive to follow-up on substrate, after sputter chromium, strengthening the layers of chrome of sputter and the adhesiveness of substrate.Often in production adopt the oxygen plasma process of removing photoresist to primer, the major control radio-frequency power that removes photoresist, remove photoresist the technological parameter such as time, oxygen pressure.
Step S103, on the described substrate with described patterned photoresist sputter chromium, form even layers of chrome pattern;
By the surface metalation means of magnetron sputtering, by there is patterned photoresist described substrate on even sputter one deck chromium, the thickness of chromium is about 100nm.
Step S104, described substrate is placed in acetone, alcohol ultrasonic cleaning respectively, in order to remove described patterned photoresist;
Particularly, in ultrasonic container, described substrate is placed in respectively acetone, alcohol ultrasonic cleaning, respectively cleans 10min, in order to remove described patterned photoresist.
Step S105, tackifier hmds evaporation is carried out to described layers of chrome pattern, in order to strengthen the adhesiveness of described layers of chrome pattern and photoresist, and on described layers of chrome pattern even spin coating positive photoresist.
Particularly, hmds (Hexamethyldisilazane is carried out to substrate, be called for short HMDS) evaporation, HMDS evaporation utilizes inert gas (such as nitrogen) to pass through substrate surface with the steam of HMDS, form thin film at substrate surface, its object is to: the micro-moisture eliminating substrate surface; The steam in air is prevented again to be adsorbed in crystal face; Increase the adhesive ability of photoresist (especially positive photoresistance) for crystal face, and then reduce to produce in developing process afterwards and start, or create the phenomenon from undercut when etching.
Alternatively, on described layers of chrome pattern after even spin coating positive photoresist, also baking process is carried out to the positive photoresist of spin coating even on described layers of chrome pattern.
Step S106, utilize described layers of chrome pattern to expose the photoresist on the described layers of chrome pattern on described substrate, after development, obtain the photoresist of layers of chrome pattern;
The detailed process of this step is identical with step 102, does not repeat them here.
Alternatively, the angle angle between the sidewall of the photoresist of described layers of chrome pattern and described substrate is not less than 90 degree.
Alternatively, described angle angle was adjusted by the time of described exposure.
Such as, the time shutter is long, and the angle angle between the sidewall of the photoresist of layers of chrome pattern and described substrate is large; Time shutter is short, and the angle angle between the sidewall of the photoresist of layers of chrome pattern and described substrate is little.
Step S107, surface metalation is carried out to the photoresist of described layers of chrome pattern;
Metallization is the process being formed layer of metal layer by various process for treating surface at nonmetallic surface, thus gives nonmetallic materials new performance.After carrying out surface metalation to the front and back of nonmetallic materials substrate, substrate is made to have some metallicities such as wear-resisting, anticorrosion.
Step S108, by micro-electroforming, the electroforming of metallic nickel formpiston is carried out to the photoresist of described layers of chrome pattern after metallization, obtain nickel positive mold.
The anode of micro-electroforming is pure nickel plate, and in micro-electroforming process, metallic nickel atom loses electronics under voltage effect, changes into nickel ion and enters in electrolytic solution.The metal level of substrate surface, as conductive layer, is coated with the substrate of metal level as negative electrode, and the metallic nickel ions in electrolytic solution moves to cathode surface and obtains electronics and change into nickle atom, and form nucleus and also grow, substrate surface after metallization piled up by crystal grain.
Substrate after metallization is placed on electroforming hood, (rectangular pulse power supply parameter, electrolyte prescription, electrolytic solution value, electrolyte temperature, stirring rate) energising deposition a period of time under certain technological parameter condition, substrate surface after metallization deposits certain thickness nickel metal layer, obtains nickel positive mold.
Alternatively, the draft angle of nickel positive mold is not more than 90 degree.The problem that after avoiding injection moulding, pattern edge tilts.
Therefore, the nickel positive mold method for making based on positive photoresist that the embodiment of the present invention provides, utilizes the positive photoresist of negativity mask plate to described substrate of target pattern to expose, after development, obtains patterned photoresist; Sputter chromium on the described substrate with described patterned photoresist, forms even layers of chrome pattern; Even spin coating positive photoresist on described layers of chrome pattern; Utilize described layers of chrome pattern to expose the photoresist on the described layers of chrome pattern on described substrate, after development, obtain the photoresist of layers of chrome pattern; Surface metalation is carried out to the photoresist of described layers of chrome pattern; Angle angle between the sidewall of the photoresist of layers of chrome pattern and described substrate is not less than 90 degree, makes metallized film uniformity and conducts electricity very well.Carry out the electroforming of metallic nickel formpiston by the photoresist of micro-electroforming to the described layers of chrome pattern after metallization, obtain nickel positive mold, the draft angle of nickel positive mold is not more than 90 degree, avoids nickel positive mold edge and tilts.The manufacture craft of nickel positive mold is easy in addition, removes photoresist conveniently.
Above-described embodiment; to the embodiment of the present invention, technical scheme and beneficial effect further describe; be understood that; the foregoing is only the embodiment of the embodiment of the present invention; be not intended to limit the present invention the protection domain of embodiment; within all spirit in the embodiment of the present invention and principle, any amendment made, equivalent replacement, improvement etc., within the protection domain that all should be included in the embodiment of the present invention.