CN214336728U - Infrared detector with van der waals asymmetric potential barrier structure - Google Patents
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- CN214336728U CN214336728U CN202022023610.7U CN202022023610U CN214336728U CN 214336728 U CN214336728 U CN 214336728U CN 202022023610 U CN202022023610 U CN 202022023610U CN 214336728 U CN214336728 U CN 214336728U
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Abstract
The patent discloses an infrared detector with van der waals asymmetric barrier structure. The detector structure comprises a substrate, a dielectric layer, a graphene layer, a molybdenum disulfide layer, a black phosphorus layer, a metal source and a drain electrode. The preparation method of the device comprises the steps of sequentially transferring the mechanically stripped graphene, molybdenum disulfide and black phosphorus onto a substrate with a dielectric layer, and respectively manufacturing a metal source electrode and a metal drain electrode on the black phosphorus and the graphene by using processes such as electron beam exposure, thermal evaporation and the like to form the van der Waals single-carrier infrared photoelectric detector with a vertical structure. The energy band structure rich in two-dimensional materials and unique physical characteristics are utilized, the asymmetric barrier energy band structure with multiple barriers is designed, dark current can be effectively inhibited, and then room-temperature black body detection, polarization detection and infrared imaging of medium-wave infrared are realized. The detector has the characteristics of room temperature work, multi-photon blocking, medium wave infrared response, high sensitivity, quick response, black body detection and the like.
Description
Technical Field
The patent relates to an infrared detector with a van der Waals asymmetric barrier structure, in particular to a medium-wave infrared single-carrier photon photoelectric detector.
Background
The single carrier photoelectric detector is provided for solving the problem of large dark current of the infrared detector, so that the infrared detector can work at high temperature. The blocking layer of a single carrier photodetector requires strict consideration of band matching and lattice matching. A large potential barrier exists in the conduction band or the valence band to block majority carriers, and a potential barrier close to zero is designed on the other energy band so that the carriers on the energy band can move freely. Therefore, dark currents such as surface leakage current and multi-photon dark current are blocked by the barrier, and the photocurrent is not suppressed. However, the conventional material epitaxial growth inevitably has lattice mismatch and interface defects, which seriously hinders the development of high-performance single-carrier photodetectors.
In order to solve the problems, the infrared photoelectric detector with the asymmetric barrier structure is constructed by using a two-dimensional material. The two-dimensional material has abundant and adjustable energy band structures, can meet the requirements of energy band design, and has a natural passivation surface, thereby avoiding the generation of leakage current. Meanwhile, different two-dimensional materials can be randomly stacked to form a lattice-matched van der waals junction, and the material is an ideal material for designing a novel photoelectric detector.
The patent proposes an infrared detector of van der waals asymmetric barrier structure. The single-carrier photoelectric detector uses black phosphorus as an absorption layer with a narrow band gap, molybdenum disulfide as a multi-sub barrier layer, and graphene with high mobility as a contact layer. The three materials form a typical hole blocking energy band structure, a conduction band almost has no potential barrier, however, a large hole potential barrier exists in a valence band, so that the injection of holes at the end of graphene can be blocked, and dark current is effectively inhibited. The single carrier photoelectric detector realizes medium wave infrared response with the cut-off wavelength of 3.8 microns, and the black body detection rate at room temperature reaches 2.3 multiplied by 1010cm Hz1/2W-1And the black body polarization detection at room temperature and the infrared imaging at room temperature are realized. Meanwhile, the response rate of the device reaches 73 microseconds of quick response.
Disclosure of Invention
The patent provides an infrared detector with a van der Waals asymmetric potential barrier structure, and the infrared detector can be applied to the fields of room-temperature black body detection, polarization detection, infrared imaging and the like.
The detector introduces a single-carrier barrier structure into a two-dimensional material detector, and utilizes the barrier layer to block multiple photons based on the optimized design of an energy band structure, so that the dark current is reduced, and the high-sensitivity and high-speed room-temperature black body detection of a device can be realized.
The patent refers to an infrared detector of van der waals asymmetric barrier structure and a method for making the same, wherein the device structure includes:
-a substrate 1 having a substrate orientation,
-a dielectric layer 2,
-a layer of graphene 3,
-a layer 4 of molybdenum disulphide,
a source electrode (5) for generating a voltage,
-a drain electrode (6) for discharging the drain electrode,
a black phosphorus layer 7.
Wherein the substrate 1 is a P-type heavily doped Si substrate;
wherein the dielectric layer 2 is SiO2The thickness is 280 +/-10 nanometers;
wherein the thickness of the graphene layer 3 is 5-10 nanometers;
wherein the thickness of the molybdenum disulfide layer 4 is 10-20 nanometers;
the metal source electrode 5 is a Cr electrode and an Au electrode, the thickness of the Cr electrode on the graphene layer is about 15 nanometers, and the thickness of the Au electrode on the Cr electrode is 75 nanometers;
the drain electrode 6 is a Cr electrode and an Au electrode, the thickness of Cr on the black phosphorus layer is about 15 nanometers, and the thickness of Au on Cr is 75 nanometers;
wherein the thickness of the black phosphorus layer 7 is 40-150 nm.
The patent refers to an infrared detector of van der waals asymmetric barrier structure and its preparing process, which includes the following steps:
1) stripping graphene layer from graphite material by mechanical stripping method on SiO2A dielectric layer;
2) stripping a molybdenum disulfide layer from a molybdenum disulfide material by a mechanical stripping method, and transferring the molybdenum disulfide layer to one end of a graphene layer by a micro-area fixed-point transfer method;
3) stripping the black phosphorus layer from the black phosphorus material by a mechanical stripping method, transferring and covering the black phosphorus layer on the surface of the molybdenum disulfide layer by a micro-area fixed-point transfer method, and covering the other end of the black phosphorus layer on the SiO layer2The dielectric layer is arranged on the substrate and is prevented from contacting the molybdenum disulfide layer;
4) and respectively depositing a chromium source electrode and a gold drain electrode on one end of the pre-transferred graphene layer and one end of the pre-transferred black phosphorus layer by using processes such as electron beam exposure, thermal evaporation, stripping and the like.
The single carrier barrier structure designed based on the two-dimensional material does not need to consider the problem of lattice matching, and a high-quality interface can be obtained between the materials. Meanwhile, compared with a junction type device, the multi-sub-blocking asymmetric barrier structure can obtain lower dark current at the same temperature, and a complex doping process in the process of constructing the heterojunction is avoided. The infrared photoelectric detector composed of graphene, molybdenum disulfide and black phosphorus has a unique energy band structure, no electron barrier exists in a conduction band, and a larger hole barrier exists in a valence band. By constructing a single carrier band structure of hole blocking, the surface leakage current and the multi-photon dark current can be effectively reduced, but the photocurrent is not inhibited. Here, an n-type doped barrier layer introduces a space charge region, resulting in the generation of a defect-assisted recombination current (SRH). However, it is due to the introduction of the doped barrier layer that the device can be operated at zero bias. The black phosphorus with narrow band gap is used as an absorption layer, so that the polarization detection of the medium-wave infrared with wide spectral response and high extinction ratio can be realized. By utilizing the flying symmetrical potential barrier structure, the device realizes high-sensitivity room-temperature black body detection and infrared imaging, and the response rate of the device reaches 73 microseconds under 2-micrometer laser and 150 microseconds under a black body light source.
The advantage of this patent lies in: this patent is based on vertical structure's van der Waals list carrier barrier structure, under reverse bias, many sons are blockked by the hole barrier, and the photocurrent can not be inhibited, have effectively reduced dark current to improve the performance of device, realized the infrared black body of medium wave of room temperature and surveyed. In addition, the device also has the characteristics of room temperature work, high sensitivity, wide wave band, quick response and the like, and has great application prospect in aspects of blackbody detection, polarization detection, infrared imaging and the like.
Drawings
Fig. 1 is a schematic diagram of a device structure.
In the figure: the substrate 1, the dielectric layer 2, the graphene layer 3, the molybdenum disulfide layer 4, the source electrode 5, the drain electrode 6 and the black phosphorus layer 7.
FIG. 2 is a band diagram of an infrared detector under illumination.
FIG. 3 is a graph of detectivity of an infrared detector at different black body temperatures.
FIG. 4 is a graph of the response time of an infrared detector at 900 deg.C black body and 2 micron laser.
FIG. 5 is polarization detection of an infrared detector at 900 ℃ black body.
Fig. 6 is room temperature infrared imaging of an infrared detector.
Detailed Description
The following detailed description of embodiments of the present patent refers to the accompanying drawings in which:
the patent develops an infrared detector with a van der waals asymmetric barrier structure. By means of unique asymmetric potential barrier structure design, dark current can be effectively inhibited, so that the detection rate of the device is improved, and black body detection and infrared imaging at room temperature are finally realized.
The method comprises the following specific steps:
1. substrate selection
Selecting heavily doped p-type silicon as substrate, SiO2The thickness of the dielectric layer is about 280 +/-10 nanometers.
2. Two-dimensional material transfer
Sequentially stripping three two-dimensional materials of a graphene layer, a molybdenum disulfide layer and a black phosphorus layer by a mechanical stripping method, and sequentially transferring the graphene layer, the molybdenum disulfide layer and the black phosphorus layer to SiO by a fixed-point transfer method in a nitrogen box2On the dielectric layer, the graphene layer is arranged at the bottom, the molybdenum disulfide layer covers one end of the graphene layer, one end of the black phosphorus layer covers the molybdenum disulfide layer, and the other end of the black phosphorus layer partially covers SiO2And the dielectric layer is not contacted with the graphene layer.
3. Source and drain preparation
Carrying out accurate positioning exposure on the electrode pattern by using electron beam exposure, and then developing by using a PMMA developing solution; preparing a metal electrode by using a thermal evaporation technology, wherein the chromium is 15 nanometers, and the gold is 75 nanometers; and finally, soaking the substrate in an acetone solution for 10 minutes, and stripping the metal film to obtain the metal source and drain electrodes.
4. An infrared detector with three structural parameters of van der Waals asymmetric barrier structure is prepared. Device with a metal layerFirstly, the substrate is a P-type heavily doped Si substrate; the dielectric layer is SiO2The thickness is 280 +/-10 nanometers; the thickness of the graphene layer is 5 nm; the thickness of the molybdenum disulfide layer is 10 nanometers; the metal source is a Cr electrode and an Au electrode, the thickness of the Cr electrode on the graphene layer is about 15 nanometers, and the thickness of the Au electrode on the Cr electrode is 75 nanometers; the thickness of the black phosphorus layer is 40 nm; the metal drain is a Cr electrode and an Au electrode, the thickness of the Cr electrode is about 15 nanometers on the black phosphorus layer, and the thickness of the Au electrode is 75 nanometers on the Cr electrode. The device II comprises a substrate, a substrate and a control circuit, wherein the substrate is a P-type heavily doped Si substrate; the dielectric layer is SiO2The thickness is 280 +/-10 nanometers; the thickness of the graphene layer was 7.5 nm; the thickness of the molybdenum disulfide layer is 15 nanometers; the metal source is a Cr electrode and an Au electrode, the thickness of the Cr electrode on the graphene layer is about 15 nanometers, and the thickness of the Au electrode on the Cr electrode is 75 nanometers; the thickness of the black phosphorus layer was 95 nm; the metal drain is a Cr electrode and an Au electrode, the thickness of the Cr electrode is about 15 nanometers on the black phosphorus layer, and the thickness of the Au electrode is 75 nanometers on the Cr electrode. A third device, wherein the substrate is a P-type heavily doped Si substrate; the dielectric layer is SiO2The thickness is 280 +/-10 nanometers; the thickness of the graphene layer is 10 nm; the thickness of the molybdenum disulfide layer is 20 nanometers; the metal source is a Cr electrode and an Au electrode, the thickness of the Cr electrode on the graphene layer is about 15 nanometers, and the thickness of the Au electrode on the Cr electrode is 75 nanometers; the thickness of the black phosphorus layer is 150 nm; the metal drain is a Cr electrode and an Au electrode, the thickness of the Cr electrode is about 15 nanometers on the black phosphorus layer, and the thickness of the Au electrode is 75 nanometers on the Cr electrode. The devices with three structural parameters have similar photoelectric properties, and the performance indexes are shown in fig. 3, fig. 4, fig. 5 and fig. 6.
5. Fig. 1 is a schematic diagram of a device structure. Wherein: the substrate 1, the dielectric layer 2, the graphene layer 3, the molybdenum disulfide layer 4, the drain electrode 5, the source electrode 6 and the black phosphorus layer 7.
6. FIG. 2 is a band diagram of an infrared detector under illumination. The three materials of graphene, molybdenum disulfide and black phosphorus almost have no electron potential barrier in a conduction band, and have a larger hole potential barrier in a valence band. When light irradiates the surface of the device, electron-hole pairs are generated at the black phosphorus of the absorption layer, electrons are collected by the anode along the conduction band under the action of external bias voltage, the holes are directly collected by the cathode, and the holes at the graphene are blocked by molybdenum disulfide.
7. FIG. 3 shows the detection of infrared detector at different blackbody temperaturesAnd (5) measuring a rate curve. The device shows excellent room temperature black body detection capability, the detection cut-off wavelength is 3.8 microns, and the peak detection rate reaches 2.3 multiplied by 1010cm Hz1/2W-1。
8. FIG. 4 is a graph of the response time of an infrared detector detecting a black body at 900 deg.C and a 2 micron laser. The time of the rising edge is defined as the time required for the photocurrent to increase from ten percent to ninety percent and the time of the falling edge is defined as the time required for the photocurrent to decrease from ninety percent to ten percent. Under a 2 micron laser, the device had a rising edge time of 73 μ s and a falling edge time of 77 μ s. Under a 900 ℃ blackbody light source, the-3 dB response frequency is 2.3kHz, and the corresponding-3 dB response time under the blackbody is 150 mus.
9. FIG. 5 is polarization detection of an infrared detector at 900 ℃ black body. Under the blackbody light source without polarization, a half-wave plate and a polaroid are respectively placed in a light path, and photocurrent under different polarization angles is recorded on a phase lock by modulating the blackbody light source, so that the extinction ratio of the device under the blackbody light source is finally obtained to be about 3.5. The device can realize high-performance polarization detection without an external optical lens.
10. Fig. 6 is room temperature infrared imaging of an infrared detector. A U-shaped heating pipe of a blackbody-like light source is used as an imaging target, and the imaging target is converged on a detector through a lens. A germanium filter is placed in front of a detector, a two-dimensional moving platform is controlled, a detection target is scanned line by line, the light intensity of each pixel point is collected and recorded through a computer, and finally a high-resolution infrared image is formed. Without the help of a phase-locked amplifier, a high-resolution room temperature infrared image is obtained, and the detector has good detection performance.
Claims (1)
1. An infrared detector with van der Waals asymmetric barrier structure comprises a substrate (1) and SiO2Dielectric layer (2), graphite alkene layer (3), molybdenum disulfide layer (4), source electrode (5), black phosphorus layer (7), drain electrode (6), its characterized in that:
the structure of the detector is as follows: SiO is arranged on a P-type Si substrate (1)2A dielectric layer (2) and a graphene layer (3) partially covered on the SiO2On dielectric layer (2), it has molybdenum disulfide layer (4) to cover in graphite alkene layer (3) one end, has source electrode (5) at graphite alkene layer (3) other end, and black phosphorus layer (7) cover on molybdenum disulfide layer (4) and graphite alkene layer (3) and SiO2The drain electrode (6) is positioned on the black phosphorus layer (7) at the part which is not contacted with the dielectric layer (2);
the substrate (1) is a P-type heavily doped Si substrate;
the SiO2The thickness of the dielectric layer (2) is 280 +/-10 nanometers;
the thickness of the graphene layer (3) is 5-10 nanometers;
the thickness of the molybdenum disulfide layer (4) is 10-20 nanometers;
the source electrode (5) is a Cr electrode and an Au electrode, the thickness of the Cr electrode on the graphene layer is 15 nanometers, and the thickness of the Au electrode on the Cr electrode is 75 nanometers;
the thickness of the black phosphorus layer (7) is 40-150 nanometers;
the drain electrode (6) is a Cr electrode and an Au electrode, the thickness of Cr on the black phosphorus layer is 15 nanometers, and the thickness of Au on Cr is 75 nanometers.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114784125A (en) * | 2022-03-25 | 2022-07-22 | 国科大杭州高等研究院 | Asymmetric induction room-temperature high-sensitivity photoelectric detector and preparation method thereof |
| CN115148843A (en) * | 2022-07-04 | 2022-10-04 | 安徽大学 | Wide-spectrum response infrared detector based on asymmetric barrier energy band structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114784125A (en) * | 2022-03-25 | 2022-07-22 | 国科大杭州高等研究院 | Asymmetric induction room-temperature high-sensitivity photoelectric detector and preparation method thereof |
| CN114784125B (en) * | 2022-03-25 | 2024-04-02 | 国科大杭州高等研究院 | Asymmetric induction room temperature high-sensitivity photoelectric detection device and preparation method thereof |
| CN115148843A (en) * | 2022-07-04 | 2022-10-04 | 安徽大学 | Wide-spectrum response infrared detector based on asymmetric barrier energy band structure |
| CN115148843B (en) * | 2022-07-04 | 2023-10-31 | 安徽大学 | Wide-spectrum response infrared detector based on asymmetric potential barrier energy band structure |
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