CN101538006B - Method for preparing optical modulation thermal imaging focal plane array - Google Patents

Method for preparing optical modulation thermal imaging focal plane array Download PDF

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CN101538006B
CN101538006B CN2009103018222A CN200910301822A CN101538006B CN 101538006 B CN101538006 B CN 101538006B CN 2009103018222 A CN2009103018222 A CN 2009103018222A CN 200910301822 A CN200910301822 A CN 200910301822A CN 101538006 B CN101538006 B CN 101538006B
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focal plane
thermal imaging
optical modulation
plane array
imaging focal
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CN101538006A (en
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焦斌斌
陈大鹏
欧毅
叶甜春
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Zhongke Weizhi Technology Co ltd
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Institute of Microelectronics of CAS
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Abstract

The invention relates to a method for preparing an optical modulation thermal imaging focal plane array, comprising the following steps of: step 1, preparing a doped layer on the upper surface of a monocrystalline silicon piece; step 2, etching a groove on the upper surface of the monocrystalline silicon piece according to a preset pattern; step 3, covering a silicon oxide layer on the inner wall of the groove; step 4, growing amorphous silicon to fill the groove fully; step 5, covering a thin layer A on the upper surface of the monocrystalline silicon piece; step 6, covering a metal layer on the thin layer A; step 7, etching the metal layer according to the preset pattern; step 8, etching the thin layer according to the preset pattern; step 9, corroding monocrystal line silicon from the back of the silicon chip according to the preset pattern; and step 10, corroding the doped layer according to the preset pattern so as to obtain the optical modulation thermal imaging focal plane array with silicon support framework and hollow-out structure.

Description

The preparation method of optical modulation thermal imaging focal plane array
Technical field
The invention belongs to the silicon micro mechanical manufacture field in the microelectric technique, particularly a kind of silicon micromachining technique is made the method for the full engraved structure optical modulation thermal imaging focal plane array (FPA) of band silicon support frame.
Background technology
Adopt optical modulation method, adopt the micro-cantilever heat insulation structure mostly based on the non-refrigeration type infrared acquisition focal-plane array (FPA) of MEMS (MEMS), the structure of their detectivity and device has direct relation.The focal-plane array (FPA) of this type adopts the plurality of layers of double Material Cantilever Beam heat insulation structure that has sacrifice layer usually, the characteristics of this structure are the silicon substrates that remains with the infrared-sensitive district, and utilize sandwich construction to realize the heat isolation, its shortcoming is that infra-red radiation can be reflected by silicon substrate earlier before arriving sensing unit, thereby cause the infra-red radiation utilization rate of this class device low, influence device performance.In order to address this problem, we had once proposed the light modulation un-cooled infrared focal plane array of the full engraved structure of a kind of substrate, the characteristics of this device are that the silicon substrate in the infrared-sensitive unit area all is removed, and sensing unit relies on the thin film support structure fully.The light modulation un-cooled infrared focal plane array of the full engraved structure of this kind has solved the problem that infra-red radiation is reflected by silicon substrate, thereby has greatly improved the response sensitivity performance of device.But this device is owing to device architecture is only supported by thin film, thus fragile unusually, be easy to breakage.
Summary of the invention
Technical problem to be solved by this invention provides a kind of preparation method of making the full engraved structure optical modulation thermal imaging focal plane array (FPA) of band silicon support frame.
The present invention solves the problems of the technologies described above by following technical solution, and the present invention proposes a kind of preparation method of the full engraved structure optical modulation thermal imaging focal plane array with silicon support frame, comprises the steps:
Step 1, cover doped layer at the monocrystalline silicon piece upper surface;
Step 2, according to predetermined pattern, at monocrystalline silicon piece upper surface etching groove;
Step 3, at trench wall capping oxidation silicon layer;
Step 4, growth non-crystalline silicon fill up groove;
Step 5, at monocrystalline silicon piece upper surface cover layer A;
Step 6, on thin layer A, cover metal level;
Step 7, according to predetermined pattern, etching sheet metal;
Step 8, according to predetermined pattern, etched film layer A;
Step 9, according to predetermined pattern, from back side corrosion monocrystalline silicon;
Step 10, by predetermined pattern, the corrosion doped layer.
Thereby obtain full engraved structure optical modulation thermal imaging focal plane array with silicon support frame.
Preferably, above-mentioned monocrystalline silicon piece monocrystalline silicon crystal orientation is<100 〉.
Preferably, in the above-mentioned steps 1, described doped layer be after adopting high energy particle to inject again the impurity diffusing, doping technology of the method for high annealing or the standard dense B of admixture (boron), P (phosphorus) or As (arsenic) impurity on described monocrystalline silicon piece realize.
Preferably, in the above-mentioned steps 2, described on monocrystalline silicon piece etching groove be to adopt SiO2 (silica) as masking layer, use RIE (reaction particle etching) equipment or ICP (inductive couple plasma etching) equipment to realize by the dark silicon etching of anisotropic dry.
Preferably, in the above-mentioned steps 3, be to adopt dry oxidation technology or wet oxidation process to realize at the trench wall growing silicon oxide.
Preferably, in the above-mentioned steps 4, the growth non-crystalline silicon is to adopt LPCVD (deposit of low pressure chemical gas item) technology to generate one deck non-crystalline silicon at the monocrystalline silicon piece upper surface, and fill up described groove, use basic etching gas of Br (bromine) and RIE (reactive ion etching) equipment then, realize by the unnecessary non-crystalline silicon of non-crystalline silicon dry etching.
Preferably, above-mentioned steps 5 also comprises, at described monocrystalline silicon piece lower surface cover layer B, described thin layer A and thin layer B are silicon nitride material or silica material, and this process is to adopt LPCVD (low-pressure chemical vapor phase deposition) or PECVD (plasma-reinforced chemical vapor deposition) to realize.
Preferably, in the above-mentioned steps 6, described covering metal level is to adopt MSS (magnetron sputtering) technology to realize.
Preferably, in the above-mentioned steps 7, described etching sheet metal A adopts RIE (reactive ion etching) equipment, realizes by dry etch process.
Preferably, in the above-mentioned steps 8, described etched film layer A adopts RIE (reactive ion etching) equipment etching to form.
Preferably, above-mentioned steps 9 comprises that also according to predetermined pattern etched film layer B, this etching process is by using RIE (reactive ion etching) equipment, adopting RIE (reactive ion etching) technology to realize.
Preferably, in the above-mentioned steps 9, described corrosion monocrystalline silicon adopts is that KOH (potassium hydroxide) solution or TMAH (TMAH) solution are as etchant solution.
Preferably, in the above-mentioned steps 10, described corrosion doped layer is to adopt XeF 2(xenon difluoride) is as etchant gas.
In sum, the present invention is from the microfabrication angle, combination silicon loses deeply, the technology such as isotropic dry etching of non-crystalline silicon trench fill, monocrystalline silicon wet etching self termination, silicon, the preparation method of a kind of full engraved structure optical modulation thermal imaging focal plane array with silicon support frame that proposes, thereby a kind of preparation method of making the full engraved structure optical modulation thermal imaging focal plane array (FPA) of band silicon support frame that perfect the present invention proposes.
A kind of preparation method of making the full engraved structure optical modulation thermal imaging focal plane array (FPA) of band silicon support frame of the present invention also comprises: a series of figure transfer work such as the gluing of positive photoresist, exposure, development.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 to Figure 12 is the structural representation of the product that each step forms of the preparation method of the full engraved structure optical modulation thermal imaging focal plane array of band silicon support frame of the present invention.
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its specific embodiment of preparation method, structure, feature and the effect thereof of the full engraved structure optical modulation thermal imaging focal plane array of the band silicon support frame that foundation the present invention is proposed, describe in detail as after.
Step 1, with reference to Fig. 1, adopt high energy particle to inject after the method for high annealing or the impurity diffusing, doping technology of standard again, be<100 in the crystal orientation〉the dense B of front doping one deck (boron) doped layer 102 of monocrystalline silicon piece 101, its impurity concentration is greater than 1e19 1/cm 3, the degree of depth of dense B (boron) doped layer 102 of doping is between 2 microns to 20 microns;
Step 2, with reference to Fig. 2, use RIE (reaction particle etching) equipment or ICP (inductive couple plasma etching) equipment, adopt SiO2 (silica) to make masking layer 103, carry out the dark silicon etching of anisotropic dry in monocrystalline silicon piece 101 fronts and form groove, obtain the degree of depth between 5 microns to 30 microns, the groove of width between 0.5 micron to 3 microns;
Step 3 with reference to Fig. 3, adopts dry oxidation technology or wet oxidation process, and monocrystalline silicon piece is carried out oxidation, at the silicon oxide layer 104 of 0.05 micron to 0.1 micron of described groove madial wall growth one deck;
Step 4 with reference to Fig. 4 and Fig. 5, adopts LPCVD (deposit of low pressure chemical gas item) technology, and at described monocrystalline silicon piece 101 positive growth one deck amorphous silicon layers 105, amorphous silicon layer 105 thickness and fill up groove between 0.25 micron to 1.5 microns; Use the basic etching gas of Br (bromine), adopt RIE (reactive ion etching) equipment, the non-crystalline silicon etching away on the monocrystalline silicon piece 101 in groove;
Step 5, with reference to Fig. 6, adopt the technology of LPCVD (low-pressure chemical vapor phase deposition) technology or PECVD (plasma-reinforced chemical vapor deposition), at low stress nitride silicon membrane layer 106 or the silicon oxide film layer 106 of two-sided growth thickness between 0.1 micron to 2 microns of monocrystalline silicon piece 101;
Step 6 with reference to Fig. 7, adopts MSS (magnetron sputtering) technology, at the aluminum metal thin layer 107 of sputter one layer thickness between 0.1 micron to 0.8 micron on described silicon nitride film layer 106 or the silicon oxide film layer 106;
Step 7 with reference to Fig. 8, adopts RIE (reactive ion etching) equipment, adopts dry etch process to etch away the aluminum metal thin layer 107 of part;
Step 8 with reference to Fig. 9, adopts RIE (reactive ion etching) equipment, adopts fluorine base gas, etches away partial oxidation silicon membrane layer 106, forms cantilever beam structures;
Step 9, with reference to Figure 10 and Figure 11, use has the litho machine of dual surface lithography function such as the MA6 of SUSS company or 620 litho machines of EVG company and defines back side figure at monocrystalline silicon piece 101 back sides, use RIE (reactive ion etching) equipment, adopt RIE (reactive ion etching) technology, fall the silicon nitride film layer 106 or the silicon oxide film layer 106 at the part back side at the pairing silicon chip back side, silicon chip front description district dry etching, make the monocrystalline silicon at monocrystalline silicon piece 101 back sides partly expose, this need use litho machine such as the MA6 of SUSS company or 620 litho machines of EVG company with dual surface lithography function; The window of the monocrystalline silicon that monocrystalline silicon piece 101 back portions are exposed corrodes, the silicon that utilization is doped with the B element of high concentration can not be corroded that liquid corrodes and anisotropic etchant to monocrystalline silicon<111 principle that the crystal face corrosion rate is extremely low, make corrosion process arrive dense boron-dopped layer 102, automatically stop then, KOH (potassium hydroxide) solution or TMAH (TMAH) solution, concentration is respectively 33% KOH (potassium hydroxide) solution or 20% TMAH (TMAH) solution, and corrosion temperature is 50 to spend between 90 degree.
Step 10 with reference to Figure 12, adopts XeF 2(xenon difluoride) as etchant gas under normal pressure, adopt dry anisotropic to corrode and fall the monocrystalline silicon of not removed that has dense B (boron) impurity by wet etching from the front etch of silicon chip, it is dense B (boron) doped layer 102, finish corrosion work, and finally discharge device architecture, finish the manufacturing procedure of entire device.
The method of the foregoing description also comprises: a series of figure transfer work such as the gluing of positive photoresist, exposure, development.

Claims (13)

1. the preparation method of an optical modulation thermal imaging focal plane array is characterized in that, this method comprises:
Step 1, make doped layer at the monocrystalline silicon piece upper surface;
Step 2, according to predetermined pattern, at monocrystalline silicon piece upper surface etching groove;
Step 3, at trench wall capping oxidation silicon layer;
Step 4, growth non-crystalline silicon fill up groove;
Step 5, at monocrystalline silicon piece upper surface cover layer A, at monocrystalline silicon piece lower surface cover layer B;
Step 6, on thin layer A, cover metal level;
Step 7, according to predetermined pattern, the etched portions metal level;
Step 8, according to predetermined pattern, etched portions thin layer A;
Step 9, according to predetermined pattern, from silicon chip back side corrosion monocrystalline silicon; According to predetermined pattern, etched film layer B;
Step 10, by predetermined pattern, the corrosion doped layer obtains the full engraved structure optical modulation thermal imaging focal plane array with silicon support frame.
2. the preparation method of optical modulation thermal imaging focal plane array according to claim 1 is characterized in that, the monocrystalline silicon crystal orientation of above-mentioned monocrystalline silicon piece is<100 〉.
3. the preparation method of optical modulation thermal imaging focal plane array according to claim 1, it is characterized in that, in the above-mentioned steps 1, described doped layer is that impurity diffusing, doping the technology dense boron of admixture, arsenic or phosphorus on described monocrystalline silicon piece of the method for high annealing or standard are realized again after adopting high energy particle to inject.
4. the preparation method of optical modulation thermal imaging focal plane array according to claim 1, it is characterized in that, etching groove on monocrystalline silicon piece described in the above-mentioned steps 2 is to adopt silica as masking layer, uses reaction particle etching apparatus or inductive couple plasma etching apparatus to realize by the dark silicon etching of anisotropic dry.
5. the preparation method of optical modulation thermal imaging focal plane array according to claim 1 is characterized in that, in the above-mentioned steps 3, is to adopt dry oxidation technology or wet oxidation process to realize at the trench wall growing silicon oxide.
6. the preparation method of optical modulation thermal imaging focal plane array according to claim 1, it is characterized in that, in the above-mentioned steps 4, the growth non-crystalline silicon is to adopt low-pressure chemical vapor phase deposition technology to generate one deck non-crystalline silicon at the monocrystalline silicon piece upper surface, and fill up described groove, use bromo etching gas and reactive ion etching equipment then, the non-crystalline silicon falling on the described monocrystalline silicon piece in groove by the non-crystalline silicon dry etching is realized.
7. the preparation method of optical modulation thermal imaging focal plane array according to claim 1, it is characterized in that, thin layer A described in the above-mentioned steps 5 and thin layer B are silicon nitride material or silica material, and this step is to adopt low-pressure chemical vapor phase deposition or plasma-reinforced chemical vapor deposition to realize.
8. the preparation method of optical modulation thermal imaging focal plane array according to claim 1 is characterized in that, in the above-mentioned steps 6, described covering metal level is to adopt magnetron sputtering technique to realize.
9. the preparation method of optical modulation thermal imaging focal plane array according to claim 1 is characterized in that, in the above-mentioned steps 7, described etching sheet metal is to adopt reactive ion etching equipment, realizes by dry etch process.
10. the preparation method of optical modulation thermal imaging focal plane array according to claim 7 is characterized in that, in the above-mentioned steps 8, described etched film layer A adopts the reactive ion etching equipment etching to form.
11. the preparation method of optical modulation thermal imaging focal plane array according to claim 7, it is characterized in that, described in the above-mentioned steps 9 is by using reactive ion etching equipment, adopting reactive ion etching process to realize according to predetermined pattern etched film layer B.
12. the preparation method of optical modulation thermal imaging focal plane array according to claim 1 is characterized in that, in the above-mentioned steps 9, described corrosion monocrystalline silicon adopts is that potassium hydroxide solution or tetramethyl ammonium hydroxide solution are as etchant solution.
13. the preparation method of optical modulation thermal imaging focal plane array according to claim 1 is characterized in that, in the above-mentioned steps 10, described corrosion doped layer is to adopt xenon difluoride as etchant gas.
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CN101538005B (en) * 2009-03-17 2011-04-20 中国科学院微电子研究所 Manufacture method for optical modulation thermal imaging focal plane array
CN102408091B (en) * 2011-10-10 2015-04-15 无锡微奥科技有限公司 Improved wafer level package structure of micro-electro-mechanical system platform
CN104528630A (en) * 2014-12-16 2015-04-22 复旦大学 Method for preparing infrared source modification layer
CN105890767A (en) * 2015-01-23 2016-08-24 北京大学 Supporting beam type infrared focal plane array and preparation method thereof

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