CN110767811A - Photoelectric detector of methylamine lead iodoperovskite single crystal nanowire and preparation method - Google Patents
Photoelectric detector of methylamine lead iodoperovskite single crystal nanowire and preparation method Download PDFInfo
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Abstract
The invention relates to the technical field of design and preparation of a micro-nano photoelectric detector, in particular to a methylamine lead perovskite single crystal nanowire photoelectric detector, which is a methylamine lead perovskite nanowire with the diameter of 100-300 nm and the length of 100-200 mu m of an electrode evaporated and plated on a glass substrate. The method comprises the following steps of growing a one-dimensional lead iodide single crystal nanowire by a chemical vapor deposition method under the catalytic action of a metal nano island, wherein the length of the nanowire is 100-200 microns, the diameter of the nanowire is 100-300 nanometers, converting the lead iodide single crystal nanowire into a methylamine lead perovskite single crystal nanowire by the chemical vapor deposition method, transferring the methylamine lead perovskite nanowire to a glass substrate, and evaporating an electrode to prepare the methylamine lead perovskite nanowire photoelectric detector. The invention also relates to a preparation method of the methylamine lead perovskite monocrystal nanowire photoelectric detector.
Description
Technical Field
The invention relates to the technical field of design and preparation of micro-nano photoelectric detectors, in particular to a metal halide perovskite single crystal nanowire and a manufacturing method thereof.
Background
The photoelectric detector is an instrument for converting optical signals of specific wave bands into electric signals, and has wide application prospects in the fields of optical communication, missile guidance, night vision systems, biosensing and the like. Therefore, the development and practical application of miniature detectors have been widely regarded internationally. The organic/inorganic hybrid metal halide perovskite material has excellent optoelectronic properties: high absorption coefficient, wide spectrum range from ultraviolet to near infrared covered by absorption spectrum, long exciton life, long carrier transmission distance, high fluorescence yield, tunable wavelength and the like. Energy conversion efficiencies of perovskite solar cells have been reported to exceed 24%. Furthermore, optoelectronic devices based on perovskite materials, such as LEDs, lasers, photodetectors, field effect transistors, etc., also perform well. In particular, the detector using perovskite material as the light absorption layer has the advantages of high strength, high stability and easy control.
To date, researchers have used a variety of methods to grow perovskite nanowire structures. These methods are mainly divided into two categories: solution methods and chemical vapor deposition methods. The chemical vapor deposition method can finely control the length, diameter, crystallinity, and the like of the nanowire by controlling the substrate position, reaction temperature, reaction time, gas flow rate, gas flow velocity, and the like. Compared with a solution method, the method reduces the doping of a solvent in the vapor deposition process, and is expected to further improve the crystallization quality of the crystal.
In 2015, the Kaihua group of the university of Nanyang Rich university of bear utilized chemical vapor deposition to deposit Si/SiO2Methylamine lead perovskite monocrystal nanowire (Nano letters, 2015, 15(7): 4571-4577.) grows on a (285 nanometer) substrate, and according to data in the paper, the length of the methylamine lead perovskite monocrystal nanowire is more than 20%Micron, about 200 nm in diameter. The preparation method of the methylamine lead iodoperovskite monocrystal nanowire comprises the following steps: cleaning a substrate by using acetone, ethanol and deionized water; step two, preparing the lead iodide nanowire by using a chemical vapor deposition method: the deposition temperature is 380 ℃, and the deposition time is 15 minutes; and step three, converting the lead iodide nanowires into methylamine lead perovskite monocrystal nanowires by using a chemical vapor deposition method, but the methylamine lead perovskite monocrystal nanowires have the problems of small density and short length, and the grown nanowires are vertically grown and are easy to break during transfer, so that the preparation of a photoelectric device at the later stage is not facilitated.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to overcome the defects in the background technology and provide a photoelectric detector for preparing methylamine lead perovskite single crystal nanowires by horizontally growing methylamine lead perovskite single crystal nanowires with large density and long length.
The technical scheme adopted by the invention is as follows: the methylamine lead perovskite single crystal nanowire photoelectric detector is a methylamine lead perovskite nanowire which is positioned on a glass substrate and is plated with an electrode, wherein the diameter of the electrode is 100-300 nm, and the length of the electrode is 100-200 mu m. The method comprises the following steps of growing a one-dimensional lead iodide single crystal nanowire by a chemical vapor deposition method under the catalytic action of a metal nano island, wherein the length of the nanowire is 100-200 microns, the diameter of the nanowire is 100-300 nanometers, converting the lead iodide single crystal nanowire into a methylamine lead perovskite single crystal nanowire by the chemical vapor deposition method, transferring the methylamine lead perovskite nanowire to a glass substrate, and evaporating an electrode to prepare the methylamine lead perovskite nanowire photoelectric detector.
The preparation method of the methylamine lead iodoperovskite single crystal nanowire photoelectric detector comprises the following steps
Step one, preparing gold nanometer isolated islands which are uniformly distributed on a glass slide by a vacuum thermal deposition method;
step two, putting the powdered lead iodide drug into a quartz boat, putting the quartz boat into the central position in a quartz glass tube, and putting a glass slide with a gold nano island on the quartz glass tubeIn the tube, the distance between the glass slide with the gold nano island and the center of the lead iodide drug is 8-10 cm between Ar and H2Under the protection of mixed gas with the volume ratio of 10:1, adjusting the pressure to be 0.02 MPa, heating to 400 ℃, preserving the temperature for 20 min, naturally cooling to room temperature, and obtaining lead iodide single crystal nanowires on a glass slide;
putting a methyl ammonium iodide drug into a quartz boat, putting the quartz boat into the central position in a quartz glass tube, putting a glass slide with lead iodide single crystal nanowires into the quartz glass tube, keeping the substrate position 6 cm away from the center of the drug, exhausting air, adjusting the pressure to 0-0.01 MPa under the protection of Ar gas, heating to 120 ℃, preserving the temperature for 90 min, naturally cooling to room temperature, and obtaining methylamine lead perovskite single crystal nanowires on the glass slide;
moving the methylamine lead perovskite monocrystal nanowire on the glass slide to a glass substrate; loading a mask plate in a dense region of the methylamine lead perovskite single crystal nanowire, then evaporating a gold electrode by using a vacuum thermal deposition method, and removing the mask plate after evaporation is finished to obtain the methylamine lead perovskite single crystal nanowire photoelectric detector.
In the first step, the low-speed deposition of 0.1 Å/s is selected, the deposition thickness is 20 nm, at the moment, the shape of the gold nano island is island-shaped particles which are randomly distributed and are not connected into a thin film, experiments prove that under the low-speed deposition rate, the shape of the metal film is an isolated island shape when the thickness is insufficient, and the isolated islands can be connected into a film only when the deposition thickness is thick enough.
And in the fourth step, the methylamine lead perovskite monocrystal nanowire on the glass slide is moved to a clean glass substrate by a contact pressurization method.
And in the fourth step, loading a copper mesh mask plate in the region where the methylamine lead perovskite single crystal nanowires are dense, then evaporating a gold electrode by using a vacuum thermal deposition method, controlling the evaporation rate to be 2 Å/s and the thickness to be 50 nm, evaporating a 150 nm aluminum film reinforced gold electrode, controlling the evaporation rate of the aluminum electrode to be 2 Å/s at a constant speed, and removing the copper mesh mask plate after evaporation is completed to obtain the methylamine lead perovskite single crystal nanowire photoelectric detector.
The invention has the beneficial effects that: the length of the lead iodide nanowire subjected to chemical vapor deposition under the catalysis of the metal nano island is greatly improved, and the length of the methylamine lead perovskite nanowire converted by the chemical vapor deposition is correspondingly longer. The synthesis process has the advantages of simple operation, high success rate, easy control and low cost. The metal nano island is prepared by vacuum thermal deposition, and a large amount of substrates can be prepared at one time. The easy cutting and cleaning of the glass slide is an economical substrate material. The length of the nanowire growing by combining chemical vapor deposition with the gold nano island is 100-200 microns, and the diameter is 100-300 nanometers. At present, the technology of preparing electrodes by combining a thermal evaporation method with a patterned mask plate is widely applied to photoelectronic devices, and for coplanar photodetectors, the disadvantage of too short nanowire length and the preparation of the electrodes of the devices require more precise masks. The relatively long nano-wire provides great convenience in this respect, and is beneficial to the preparation of the photoelectric detector and the practical application of materials. Moreover, the long nanowire is easier to realize the integration of devices on a single nanowire, and provides greater possibility for the regulation and control of the devices.
Drawings
FIG. 1: an optical micrograph and an SEM picture of methylamine lead perovskite nanowire crystals;
FIG. 2: absorption spectrum and fluorescence spectrum of lead iodide and methylamine lead perovskite nanowire crystals;
FIG. 3: XRD diffraction pattern of methylamine lead iodoperovskite nanowire crystal;
FIG. 4: dark state and bright state current-voltage (I-V) curves of the methylamine lead perovskite nanowire photoelectric detector.
Detailed Description
The materials used in the present invention are: lead iodide (lead iodide), methyl ammonium iodide (CH)3NH3I) The glass slide comprises a glass slide, ethanol, isopropanol, deionized water, argon, hydrogen and a detergent. The dosage is as follows:
lead iodide: 0.15 g. + -. 0.001 g
CH3NH3I：0.15 g±0.001 g
Ethanol: 50 mL. + -. 5 mL
Isopropyl alcohol: 50 mL. + -. 5 mL
Deionized water: 100 mL. + -. 5 mL
Liquid detergent: 2 mL. + -. 0.1 mL
Glass slide: 10 mm x 7 mm
The invention relates to a preparation method of a one-dimensional methylamine lead-iodoperovskite nanowire.
The preparation method comprises the following steps:
1. selecting chemicals
The chemical material required by preparation is selected, and the quality, purity, concentration, fineness and precision are controlled as follows:
lead iodide: solid particles with purity of 99.999%
CH3NH3I: solid powder with purity of 99.5%
Acetone: liquid with purity of 99.8%
Ethanol: liquid, analytical grade
Isopropyl alcohol: liquid with purity of 99.8%
Deionized water: 18.2M Ω cm
Glass slide: sailing boat brand glass slide
Argon gas: 99.9 percent
Hydrogen gas: 99.9 percent
2. Cutting and cleaning of glass slide
Cutting the glass slide into a size of 10 mm multiplied by 7 mm, ultrasonically cleaning the glass slide for 30 minutes by using liquid detergent and cleaning powder, rubbing the front side and the back side for 1 minute, ultrasonically cleaning the glass slide for 15 minutes by using deionized water, ethanol and isopropanol respectively, and storing the glass slide in an isopropanol solution for later use.
3. Preparation of metallic seed islands
1) Checking whether the vacuum thermal deposition equipment operates normally or not and whether the tungsten boat is in good contact with a power supply or not;
2) taking a clean dried glass slide, and sticking the glass slide below a vapor plating mask plate by using a high-temperature adhesive tape;
3) opening the vacuum thermal deposition equipment, fixing the mask plate on a turntable at the top in the cavity, paying attention to the placing process, and carefully polluting the substrate;
4) putting metal on a tungsten boat to be used at the bottom of the cavity;
5) checking whether a quartz crystal oscillation piece probe to be used in the cavity is normally used or not, and adjusting the position of the quartz crystal oscillation piece probe to align to a substrate to be deposited;
6) closing the cavity door, operating the vacuum thermal deposition equipment to automatically vacuumize, and waiting for the vacuum degree in the cavity to reach 6' 10-4Pa；
7) Starting the turntable to rotate the substrate to ensure the uniformity of the film layer;
8) starting to heat the tungsten boat, starting a quartz crystal oscillator piece probe to monitor the deposition rate, opening a large baffle when the rate is stable, and starting evaporation;
9) monitoring the film thickness to reach the required thickness, and finishing evaporation;
10) taking a sample, carefully removing the high-temperature adhesive tape by using tweezers, and paying attention to the fact that the film layer is not scratched so as to influence the subsequent experiment;
11) and storing the prepared substrate plated with the metal seed layer in a glove box for later use, so as to isolate water and oxygen in the air and prevent the metal seed layer from being oxidized.
4. Preparation of one-dimensional lead iodide nanowires
1) A quartz glass tube 50 cm long and 2.54 cm in inner diameter was cleaned and then dried in a drying oven (10 min).
2) And blowing dust for 1 min by using nitrogen for the dried quartz glass tube, and marking the front end and the tail end of the quartz glass tube.
3) A glass slide with a gold nano island is fixed on the top of the airflow downstream position (8 cm away from the tail end of a tube) of a quartz glass tube by using a high-temperature adhesive tape, and the surface of the gold nano island faces downwards.
4) 0.15 g of a lead iodide drug having a purity of 99.999% was weighed, ground into powder, and placed in a quartz boat, which was then pushed into the center of a quartz glass tube.
5) Placing the quartz glass tube filled with medicine and glass slide into a tube furnace, connecting the front end and the tail end of the quartz glass tube with an inlet valve and an outlet valve respectively, vacuumizing the quartz glass tube through the outlet (2 min), closing the outlet valve, and introducing Ar + H into the tube2Gas mixture (Ar 95%, H)25 percent), when the pressure in the pipe reaches 0.03MPa, the air outlet valve is opened to discharge the residual trace air in the pipe.
6) Heating a quartz glass tube to 400 ℃, keeping the temperature at 400 ℃ for 20 min, and setting the gas flow rate Ar: 30sscm, H2: 3 sccm, and adjusting the pressure in the pipe to be 0.02 MPa by adjusting the gas outlet valve.
7) And after the constant temperature stage is finished, closing the air inlet valve, and closing the air outlet valve when the pressure in the tube is reduced to 0 MPa, so that the quartz glass tube is naturally cooled to the room temperature, and the one-dimensional lead iodide nanowire crystal deposited on the glass slide is obtained.
5. Conversion of lead iodide nanowires into methylamine lead perovskite nanowires
1) Marking the center position (marked as the position of the medicine) of the quartz tube and the position (marked as the position of the sample) 6 cm away from the center by using a ruler and a marking pen;
2) sticking the lead iodide nanowire sample to a corresponding position in a quartz tube by using a high-temperature adhesive tape;
3) weighing 0.15 g of MAI medicine, putting the MAI medicine into a quartz boat, and pushing the quartz boat into the central position of a quartz tube;
4) putting the quartz tube containing the lead iodide nanowire sample and the medicine into a tube furnace, so that the medicine is opposite to the central position of a heating area;
5) fixing and sealing the quartz tube by using a flange;
6) vacuumizing for 2 min before heating the medicine, introducing inert gas Ar gas at the flow rate of 30 sccm, and controlling the pressure in the tube to be between 0 MPa and 0.01 MPa;
7) heating the quartz tube to 120 ℃, stopping air flow after reacting for 90 min, and sealing the quartz tube.
8) And taking out the sample after the quartz tube is cooled to the room temperature.
6. Preparation of methylamine lead iodine perovskite nano-wire photoelectric detector-electrode preparation
1) Attaching the substrate with the grown nanowires and a clean glass substrate to each other, applying a certain pressure, and then separating the two substrates, so that part of the nanowires are transferred to the insulated glass substrate;
2) observing the transferred optical microscopic image of the nanowires on the glass substrate, finding out the position where the nanowires are more dense, and marking the reverse side of the substrate;
3) placing a copper mesh mask plate at a position where nanowires are dense, fixing the copper mesh mask plate by using a high-temperature adhesive tape, paying attention to the area where the electrode is not covered by the adhesive tape, and carefully pasting the copper mesh mask plate to prevent the single crystal nanowires from being damaged, and pasting a plurality of copper meshes for later use;
4) a vacuum thermal deposition device is used for evaporating a gold electrode for a sample, the evaporation rate is controlled to be 2 Å/s, the thickness is 50 nm, an aluminum film with the thickness of 150 nm is used for reinforcing the electrode, the evaporation rate of the aluminum electrode is also 2 Å/s at a constant speed, and a small baffle of another metal source is closed before one metal is evaporated so as to prevent the metal source from being polluted;
5) after the evaporation is finished, taking out the sample, carefully removing the copper mesh mask plate by using tweezers, and taking care not to scratch the sample in the process.
7. Detection, analysis, characterization
And detecting, analyzing and characterizing the prepared one-dimensional methylamine lead perovskite nanowire crystal. And (3) characterizing the appearance of the lead iodide nanowires by using a Hitachi SEM scanning electron microscope and a Nikon LV-150 optical microscope. And testing the macroscopic absorption spectra of the prepared lead iodide nanowires and methylamine lead perovskite nanowires by using an Shimadzu UV-2600 ultraviolet-visible absorption spectrometer. And qualitatively analyzing XRD patterns of the lead iodide nanowires and the methylamine lead perovskite nanowires by using an X-ray diffraction spectrometer. The methylamine lead perovskite nano-wire photoelectric detector is characterized by utilizing a semiconductor analyzer Agilent B1500A and THORLAB M375L 4.
And (4) conclusion: FIG. 1(a) characterizes the prepared methylamine lead perovskite nanowireA micro-crystal morphology picture, a gold seed isolated island substrate with the thickness of 20 nm is used, and the length of the obtained methylamine lead iodoperovskite nano wire is more than 100μAnd m is selected. The graph in fig. 1(b) is an SEM image of a single methylamine lead iodoperovskite nanowire obtained by transferring the methylamine lead iodoperovskite nanowire from a gold seed island substrate to a glass substrate, and the obtained SEM image has uniform crystal morphology, line width of about 300nm and good crystallization quality. Figure 2 represents the uv-vis absorption spectra of the methylamine lead perovskite nanowires. Fig. 2 shows the absorption spectra of the lead iodide nanowires and the methylamine lead perovskite nanowires, and shows the steady-state fluorescence spectrum of the methylamine lead perovskite nanowires. Compared with lead iodide nanowires which only absorb from ultraviolet to about 540 nm, the absorption spectrum of the methylamine lead perovskite nanowire covers the band from ultraviolet to near infrared, and the cut-off wavelength is 800 nm. The fluorescence spectrum full width at half maximum (FWHM) of the methylamine lead perovskite nanowire under the irradiation of 325 nm laser is 44 nm, and the peak position is 767 nm. Fig. 3 represents an XRD spectrum of the methylamine lead iodoperovskite nanowire, and it can be seen that the crystal diffraction peaks are at 14.06 °, 20.08 °, 28.59 °, 31.92 °, 40.56 ° and 43.21 °, and the corresponding crystal face indices are (110), (112), (220), (310), (224) and (314), respectively, corresponding to the perovskite material of square structure. The performance of the methylamine lead perovskite nanowire photoelectric detector is tested by using a semiconductor analyzer Agilent B1500A and a red LED (with the wavelength of 660 nm) as light sources. As shown in FIG. 4, the curve of the methylamine lead perovskite nanowire photoelectric detector is shown in a dark state I-V curve, and the incident light density is 127.3 mW/cm2The bright state I-V curve at the bottom can show that the bright-dark current ratio of the device is 56 under the bias voltage of 1V.
Compared with the background art, the invention has obvious advancement. The method comprises the steps of inducing chemical vapor deposition of a lead iodide nanowire by using a metal nano island, catalyzing the directional growth of the nanowire to form a longitudinally uniform wire with the length of 100-200 microns and the diameter of 100-300 nanometers, and then converting the lead iodide nanowire into a methylamine lead perovskite nanowire by using a chemical vapor deposition method. Compared with the preparation process of the literature, the scheme adds the first step, the growth of the lead iodide nanowires is catalyzed by the metal nano islands in the reaction process of the second step, the length and the density of the nanowires which are grown only without metal catalysis are greatly improved, and the lead iodide nanowires are effectively converted into methylamine lead perovskite nanowires by the chemical vapor deposition in the third step. The preparation process adds one step of vacuum thermal evaporation to prepare the metal nano island, but the metal nano island substrate can be prepared in a large scale at one time, the whole process is simple, and the method is favorable for obtaining a large amount of methylamine lead iodine single crystal nanowires with the length of hundreds of microns by one-time deposition. The invention makes a contribution to the practical development of the methylamine lead iodine miniature photoelectric detector.
Claims (5)
1. The methylamine lead iodoperovskite single crystal nanowire photoelectric detector is characterized in that: the methylamine lead perovskite single crystal nanowire photoelectric detector is a methylamine lead perovskite nanowire which is positioned on a glass substrate, is plated with an electrode, has the diameter of 100-300 nm and the length of 100-200 mu m.
2. A preparation method of a methylamine lead iodoperovskite single crystal nanowire photoelectric detector is characterized by comprising the following steps: the method comprises the following steps
Step one, preparing gold nanometer isolated islands which are uniformly distributed on a glass slide by a vacuum thermal deposition method;
putting the powdered lead iodide drug into a quartz boat, putting the quartz boat into the central position in a quartz glass tube, putting a glass slide with a gold nano island into the quartz glass tube, wherein the distance between the glass slide with the gold nano island and the center of the lead iodide drug is 8-10 cm between Ar and H2Under the protection of mixed gas with the volume ratio of 10:1, adjusting the pressure to be 0.02 MPa, heating to 400 ℃, preserving the temperature for 20 min, naturally cooling to room temperature, and obtaining lead iodide single crystal nanowires on a glass slide;
putting a methyl ammonium iodide drug into a quartz boat, putting the quartz boat into the central position in a quartz glass tube, putting a glass slide with lead iodide single crystal nanowires into the quartz glass tube, keeping the substrate position 6 cm away from the center of the drug, exhausting air, adjusting the pressure to 0-0.01 MPa under the protection of Ar gas, heating to 120 ℃, preserving the temperature for 90 min, naturally cooling to room temperature, and obtaining methylamine lead perovskite single crystal nanowires on the glass slide;
moving the methylamine lead perovskite monocrystal nanowire on the glass slide to a glass substrate; loading a mask plate in a dense region of the methylamine lead perovskite single crystal nanowire, then evaporating a gold electrode by using a vacuum thermal deposition method, and removing the mask plate after evaporation is finished to obtain the methylamine lead perovskite single crystal nanowire photoelectric detector.
3. The method for preparing the methylamine lead perovskite single crystal nanowire photoelectric detector as claimed in claim 2, wherein in the step one, the slow deposition of 0.1 Å/s is selected, and the deposition thickness is 20 nm.
4. The method for preparing the methylamine lead perovskite single crystal nanowire photoelectric detector as claimed in claim 2, wherein the method comprises the following steps: and in the fourth step, the methylamine lead perovskite monocrystal nanowire on the glass slide is moved to a clean glass substrate by a contact pressurization method.
5. The method for preparing the methylamine lead perovskite single crystal nanowire photoelectric detector as claimed in claim 2, wherein a copper mesh mask plate is loaded in a region where methylamine lead perovskite single crystal nanowires are dense, then a gold electrode is evaporated by a vacuum thermal deposition method, the evaporation rate is controlled to be 2 Å/s, the thickness is 50 nm, a 150 nm aluminum film reinforced gold electrode is evaporated, the evaporation rate of the aluminum electrode is 2 Å/s at a constant speed, and the copper mesh mask plate is removed after evaporation is completed, so that the methylamine lead perovskite single crystal nanowire photoelectric detector is obtained.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111883671A (en) * | 2020-08-04 | 2020-11-03 | 中国科学院半导体研究所 | Preparation method of novel organic-inorganic hybrid perovskite nanowire |
| CN112063358A (en) * | 2020-07-29 | 2020-12-11 | 阜南县中信柳木工艺品有限公司 | Processing method for improving bonding strength of wooden artware |
| CN113912105A (en) * | 2021-11-23 | 2022-01-11 | 南京工业大学 | Method for preparing and transferring ultrathin large-size lead iodide nanosheets |
-
2019
- 2019-10-28 CN CN201911031392.7A patent/CN110767811A/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| 刘艳珍: ""MAPbI3纳米线光电探测器的研究"", 《中国优秀博硕士学位论文全文数据库(硕士) 信息科技辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063358A (en) * | 2020-07-29 | 2020-12-11 | 阜南县中信柳木工艺品有限公司 | Processing method for improving bonding strength of wooden artware |
| CN111883671A (en) * | 2020-08-04 | 2020-11-03 | 中国科学院半导体研究所 | Preparation method of novel organic-inorganic hybrid perovskite nanowire |
| CN111883671B (en) * | 2020-08-04 | 2022-04-22 | 中国科学院半导体研究所 | Preparation method of organic-inorganic hybrid perovskite nanowire |
| CN113912105A (en) * | 2021-11-23 | 2022-01-11 | 南京工业大学 | Method for preparing and transferring ultrathin large-size lead iodide nanosheets |
| CN113912105B (en) * | 2021-11-23 | 2022-07-05 | 南京工业大学 | Method for preparing and transferring ultrathin large-size lead iodide nanosheets |
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