CN107146830B - A method of preparing the graphene/silicon MSM-PD with low of flexible and transparent - Google Patents

A method of preparing the graphene/silicon MSM-PD with low of flexible and transparent Download PDF

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CN107146830B
CN107146830B CN201710423821.XA CN201710423821A CN107146830B CN 107146830 B CN107146830 B CN 107146830B CN 201710423821 A CN201710423821 A CN 201710423821A CN 107146830 B CN107146830 B CN 107146830B
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silicon
film
graphene
single crystal
silicon substrate
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CN107146830A (en
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徐杨
马玲玲
阿亚兹
李炜
刘威
吕建杭
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Zhejiang University ZJU
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/1804Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic Table
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/08Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
    • H01L31/10Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors characterised by potential barriers, e.g. phototransistors
    • H01L31/101Devices sensitive to infrared, visible or ultraviolet radiation
    • H01L31/102Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier
    • H01L31/108Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier the potential barrier being of the Schottky type
    • H01L31/1085Devices sensitive to infrared, visible or ultraviolet radiation characterised by only one potential barrier the potential barrier being of the Schottky type the devices being of the Metal-Semiconductor-Metal [MSM] Schottky barrier type
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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Abstract

The invention discloses a kind of methods of graphene/silicon MSM-PD with low for preparing flexible and transparent, comprising: the silicon thin film of SOI silicon substrate is etched into silicon strip;Gold electrode figure, gold-plated electrode are made by lithography in the silica upper surface of the barrier of SOI silicon substrate;Prepare single crystal graphene film;Single crystal graphene film is covered in silica separation layer, silicon strip and gold electrode upper surface;Single crystal graphene film pattern is melted into interdigitation;PC film is covered in patterned device upper surface, edge PC film is scraped off, puts into BOE etching liquid and etch away silicon substrate;Photodetector of the present invention can carry out wide spectrum detection, and it is low to solve the problems, such as that traditional silicon substrate PIN junction responds ultraviolet detector, and photo-generated carrier and silicon crystal lattice generate electron impact ionization, obtain very high gain;Preparation process of the present invention is simple, low in cost, has responsiveness high, fast response time, internal gain is big, and on-off ratio is small, the characteristics of being easily integrated.

Description

A kind of graphene/silicon metal-semiconductor-metal photodetection preparing flexible and transparent The method of device
Technical field
The invention belongs to technical field of photoelectric detection, it is related to photoelectric detector structure more particularly to a kind of prepares flexibility The method of transparent graphene/silicon MSM-PD with low
Background technique
Good electric conductivity, higher optical clarity and good mechanical flexibility make graphene become next-generation soft Property electronic device has relatively good application prospect.Wherein graphene forms schottky junction in conjunction with semiconductor, can be applied to electricity Son and optoelectronic areas.Although organic semiconductor is substantially flexibly, graphene-semiconductor Schottky knot is flexible electronic The ideal chose of device.However, such as stability is poor, the main problems such as not reproducible response and device performance difference, especially with Silicon-based devices are compared, and are limited it and are widely applied.In addition, organic semiconductor has lower migration compared with monocrystalline silicon Rate.
Silicon pushes always electronics, photoelectron and solar-electricity as one of most important semiconductor material of twentieth century The immense success of pond industry, wherein being used mostly in the form of monocrystalline, polycrystalline silicon wafer and amorphous and nanocrystalline thin film.By In the bandgap structure that silicon is suitable for, mature CMOS fabrication technology, high reliability, the surface state well controlled can with low cost Extension production and high speed optoelectronic detection, make silicon become the ideal semiconductor material for photoelectric detector.However body silicon crystal Rigidity limit it in the application in flexible optoelectronic detector field, in terms of especially flexible detection electronic device.But work as Si It is preferable using flexibility when film is thinned to less than 50 microns, be easily bent, and common scissor cut can be used, make its There is certain application value in flexible electronic application.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of graphene/silicon gold for preparing flexible and transparent The method of category-semiconductor-metal (MSM) photodetector.
The purpose of the present invention is achieved through the following technical solutions: a kind of graphene/silicon gold preparing flexible and transparent Category-semiconductor-metal photodetector method, comprising the following steps:
(1) silicon thin film of SOI silicon substrate is etched into rectangular silicon strip, the SOI using deep energy level reactive ion etching machine ICP Silicon substrate includes silicon thin film, silica separation layer and silicon substrate from top to bottom;
(2) the gold electrode figure of silicon strip is made positioned at silicon strip two sides and is parallel to by lithography in silica upper surface of the barrier, Then electron beam evaporation technique gold-plated electrode is used;
(3) single crystal graphene film is prepared in copper foil substrate using chemical vapor deposition method;
(4) single crystal graphene film is covered in silica separation layer, silicon strip and gold electrode upper surface;
(5) single crystal graphene film is patterned into interdigitation using photoetching technique, is gone followed by plasma etching Except extra graphene, it is graphical after single crystal graphene film coverage area in the range of gold electrode surrounds;
(6) PC film is covered in the patterned device upper surface that step obtains, scrapes off edge PC film, and put BOE quarter into Silicon substrate is etched away in erosion liquid, prepares the ultra-thin graphene/silicon MSM-PD with low of flexible and transparent.
Further, in the step, the silicon film thickness is 200nm, silicon strip with a thickness of 200nm, silica every Absciss layer is with a thickness of 100nm.
Further, in the step, growth thickness is the chromium adhesion layer of 5nm first on silica separation layer, so The gold electrode of 60nm is grown afterwards.
Further, in the step, the transfer method of graphene are as follows: single crystal graphene film surface is uniformly coated one Layer polymethyl methacrylate film, is then placed in 4h erosion removal copper foil in etching solution, leaves by poly-methyl methacrylate The single crystal graphene film of ester support;After the single crystal graphene film that polymethyl methacrylate supports is cleaned with deionized water It is transferred to the upper surface of silica separation layer, silicon strip and gold electrode;Finally poly- methyl-prop is removed with methylene chloride and isopropanol E pioic acid methyl ester;Wherein, the etching solution is made of CuSO4, HCl and water, CuSO4:HCl:H2O=10g:50ml:50ml.
The invention has the following advantages: the detector using graphene as active layer and transparent electrode, eliminates dead layer, Enhance the absorption of incident light;Silica separation layer reduces the influence of silicon face state, while inhibiting reverse saturation current;? Smaller bias can work normally, and patterned silicon strip thickness used in the present invention is about 200nm, much smaller than the diffusion of body silicon Length (μm) is conducive to the separation of photo-generated carrier, can effectively distinguish brightness electric current, improve the performance of photodetector; The ultra-thin graphene MSM photoelectric detector flexibility prepared is good and transparent, can theoretically be transferred on any carrier, and have There is good performance.Ultraviolet imagery can be carried out to its array simultaneously.Incident light is irradiated to photodetector surfaces of the present invention, by stone Black alkene and silicon substrate absorb.The photo-generated carrier (hole-electron pair) of generation is separated under built-in electric field action, direction of an electric field Graphene is directed toward by silicon.Electric field is stronger under reverse biased, and photohole is mobile to graphene, and light induced electron then flows to silicon substrate, Form photogenerated current.MSM photoelectric detector is interdigital structure in the present invention, can carry out ultraviolet imagery to its array.Light of the present invention For electric explorer material therefor using silicon as basic material, preparation process is simple, at low cost, easily simultaneous with existing semiconductor standard processes Hold.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the graphene/silicon MSM-PD with low of flexible and transparent of the present invention;
Fig. 2 be in the present invention work of photodetector prepared by embodiment at -2-2V, under different incident optical powers Light opens the optical response plot figure that lower device is closed with light;
(a) is equipment used in ultraviolet imagery in the present invention in Fig. 3;(b) it is labeled as the original image of ZJU;It (c) is ultraviolet lighting Penetrate the lower figure that ZJU is presented;(d) it is labeled as the original image of ISEE;(e) figure for ISEE is presented under ultraviolet light.
Specific embodiment
A kind of work of the graphene/silicon MSM-PD with low of flexible and transparent provided by the invention is former It manages as follows:
Incident light is irradiated to photodetector surfaces of the present invention, is absorbed by graphene and silicon substrate.The photoproduction current-carrying of generation Sub (hole-electron pair) is separated under built-in electric field action, and direction of an electric field is directed toward graphene by silicon.Electric field is more under reverse biased By force, photohole is mobile to graphene, and light induced electron then flows to silicon substrate, forms photogenerated current.Patterned silicon strip thickness is about Brightness electricity can be effectively distinguished much smaller than the separation that the diffusion length (μm) of body silicon is conducive to photo-generated carrier for 200nm Stream, improves the performance of photodetector.Graphene MSM detector of the invention can be transferred on PC film.
The present invention is further illustrated with reference to the accompanying drawings and examples.
A kind of graphene/silicon MSM-PD with low preparing above-mentioned flexible and transparent provided by the invention Method, comprising the following steps:
(1) silicon thin film of SOI silicon substrate (1) is etched into rectangular silicon strip (3) using deep energy level reactive ion etching machine ICP, The SOI silicon substrate (1) includes silicon thin film, silica separation layer (2) and silicon substrate (1) from top to bottom;
(2) it makes by lithography in silica separation layer (2) upper surface positioned at silicon strip (3) two sides and is parallel to the gold of silicon strip (3) Then electrode pattern uses electron beam evaporation technique gold-plated electrode (4);
(3) single crystal graphene film (5) are prepared in copper foil substrate using chemical vapor deposition method;
(4) single crystal graphene film (5) are covered in silica separation layer (2), silicon strip (3) and gold electrode (4) upper surface;
(5) single crystal graphene film (5) are patterned into interdigitation using photoetching technique, followed by plasma etching Remove extra graphene, it is graphical after single crystal graphene film (5) the range surrounded in gold electrode (4) of coverage area It is interior;
(6) PC film is covered in the patterned device upper surface that step (5) obtains, scrapes off edge PC film, and put BOE into Silicon substrate (1) is etched away in etching liquid, prepares the ultra-thin graphene/silicon metal-semiconductor-metal photodetection of flexible and transparent Device.
The graphene/silicon MSM-PD with low ultra-thin to above-mentioned flexible and transparent adds small bias, makes it It works normally, adds different incident optical powers to realize gain, as shown in Figure 2.
Flexible and transparent prepared by the present embodiment graphene/silicon MSM-PD with low work- Under 2-2V, the brightness current curve variation under the light irradiation of the different incident optical powers of 405nm is as shown in Figure 2.Wherein in device Add small bias on the gold electrode 4 of part.Figure it is seen that prepared device is under no light condition, dark current very little;And work as Incident wavelength 405nm, incident optical power generate apparent photoelectric current when being gradually increased to 0.4mW from 0.2 smooth function.As shown in Figure 2 When device works in -2-2V, curve is in smooth S type curve, i.e., back-to-back schottky junction characteristic curve.Discovery is tested simultaneously Device all has very superior photodetection characteristic to near-infrared ultraviolet.
Fig. 3 is array type device in ultraviolet imagery figure, it can be seen that figure is apparent, and is had excellent performance.

Claims (3)

1. a kind of method for the graphene/silicon MSM-PD with low for preparing flexible and transparent, which is characterized in that The following steps are included:
(1) silicon thin film of SOI silicon substrate (1) is etched rectangular silicon strip (3) using deep energy level reactive ion etching machine ICP, it is described SOI silicon substrate (1) includes silicon thin film, silica separation layer (2) and silicon substrate (1) from top to bottom;
The silicon film thickness is 200 nm, and silicon strip (3) is with a thickness of 200 nm, and silica separation layer (2) is with a thickness of 100 nm;
(2) it makes by lithography in silica separation layer (2) upper surface positioned at silicon strip (3) two sides and is parallel to the gold electrode of silicon strip (3) Then figure uses electron beam evaporation technique gold-plated electrode (4);
(3) single crystal graphene film (5) are prepared in copper foil substrate using chemical vapor deposition method;
(4) single crystal graphene film (5) are covered in silica separation layer (2), silicon strip (3) and gold electrode (4) upper surface;
(5) single crystal graphene film (5) are patterned into interdigitation using photoetching technique, are removed followed by plasma etching Extra graphene, it is graphical after single crystal graphene film (5) coverage area in the range of gold electrode (4) surround;
(6) PC film is covered in the patterned device upper surface that step (5) obtains, scrapes off edge PC film, and put BOE etching into Silicon substrate (1) is etched away in liquid, prepares the ultra-thin graphene/silicon MSM-PD with low of flexible and transparent.
2. a kind of graphene/silicon metal-semiconductor-metal photodetection for preparing flexible and transparent according to claim 1 The method of device, which is characterized in that in the step (2), growth thickness is the chromium of 5 nm first on silica separation layer (2) Then adhesion layer grows the gold electrode (4) of 60 nm.
3. a kind of graphene/silicon metal-semiconductor-metal photodetection for preparing flexible and transparent according to claim 1 The method of device, which is characterized in that in the step (4), the transfer method of graphene are as follows: by single crystal graphene film (5) surface Uniformly one layer of polymethyl methacrylate film of coating, is then placed in 4h erosion removal copper foil in etching solution, leaves by poly- first The single crystal graphene film (5) of base methyl acrylate support;The single crystal graphene film (5) that polymethyl methacrylate is supported The upper surface of silica separation layer (2), silicon strip (3) and gold electrode (4) is transferred to after being cleaned with deionized water;Finally use dichloro Methane and isopropanol remove polymethyl methacrylate;Wherein, the etching solution is made of CuSO4, HCl and water, CuSO4: HCl:H2O=10g:50ml:50ml.
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CN108257946B (en) * 2017-11-30 2020-05-12 中国科学院微电子研究所 Photoelectric detector and manufacturing method thereof
CN108054180A (en) * 2018-01-29 2018-05-18 杭州紫元科技有限公司 A kind of charge coupling device based on graphene/insulating layer/semiconductor structure
CN108281453A (en) * 2018-01-29 2018-07-13 杭州紫元科技有限公司 A kind of flexibility charge coupling device and preparation method thereof
CN108281443B (en) * 2018-01-29 2021-05-11 杭州紫元科技有限公司 Graphene/silicon heterojunction CCD pixel array based on SOI substrate and preparation method thereof
CN111952402B (en) * 2020-08-26 2023-04-25 合肥工业大学 Color detector based on graphene/ultrathin silicon/graphene heterojunction and preparation method thereof
CN113782640B (en) * 2021-09-10 2023-02-21 中国科学院半导体研究所 Preparation method and system of detector chip based on graphene-CMOS monolithic integration
CN114864736A (en) * 2022-02-24 2022-08-05 电子科技大学 Novel exciton regulating device based on two-dimensional transition metal sulfide semiconductor and preparation method and regulating method thereof
CN114583003B (en) * 2022-04-29 2022-10-11 浙江大学 Vertical photoelectric detector based on silicon/graphene nano-film/germanium and preparation method

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