Full-light-operated zinc oxide / perovskite heterojunction bionic visual device, preparation method, system and method

Abstract

The invention discloses a full-light-control zinc oxide / perovskite heterojunction bionic visual device, a preparation method, a system and a method.The device comprises a ZnO microwire serving as a conducting channel, a perovskite shell layer, an indium particle electrode and a quartz substrate, and the ZnO microwire is fixed to the quartz substrate through the indium particle electrode; the middle part of the ZnO microwire is wrapped by the perovskite shell layer; the oxygen vacancy defect state in the ZnO microwire is modulated through ultraviolet light, reversible switching of positive and negative photoconductance responding to visible light is achieved, the human eye light pigment regeneration and bleaching process is simulated, and photopic vision and scotopic vision adaptation is achieved; under the modulation of strong ultraviolet light, the device shows a negative photoconductive effect and simulates a self-protection mechanism of eyelid closure. The device integrates visual adaptation and protection functions in a single structure, does not need an external grid voltage or a complex circuit, and provides a new idea for a new generation of bionic visual sensors.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bionic optoelectronic devices and neuromorphic visual sensing, and particularly relates to a full-optical-control zinc oxide / perovskite heterojunction bionic visual device, a preparation method, a system and a method. BACKGROUND

[0002] With the rapid development of Internet of Things (IoT) and artificial intelligence (AI) technologies, there is a high demand for the intelligent sensing capability of machine vision systems in dynamic environments. Traditional visual sensing systems based on the von Neumann architecture have inherent defects such as low energy efficiency, high latency, and difficulty in real-time processing of complex light environment information. Inspired by biological visual systems, neuromorphic visual sensing, which integrates sensing and computing, has become an important development direction.

[0003] The human retina can achieve adaptive adjustment (photopic and scotopic adaptation) in a range of several orders of magnitude of light intensity through the coordination and switching of rod cells and cone cells, and can achieve self-protection in strong light through mechanisms such as eyelid closure. Currently, most bionic visual devices rely on external gate voltages or complex cascaded circuits to achieve dynamic modulation of light response, making it difficult to achieve full-optical-control bionic visual functions that integrate adaptation and self-protection in a single device. SUMMARY

[0004] The application aims to solve the problem that the prior art cannot achieve full-optical-control bionic visual functions that integrate adaptation and self-protection in a single device. The application provides a full-optical-control zinc oxide / perovskite heterojunction bionic visual device, a preparation method, a system and a method, which have a simple structure, do not require external gate voltages, and can simulate human visual adaptation and achieve self-protection functions.

[0005] Technical solution: In a first aspect, the application provides a full-optical-control zinc oxide / perovskite heterojunction bionic visual device, which includes a ZnO microwire as a conductive channel, a perovskite shell layer, an indium particle electrode, and a quartz substrate. The ZnO microwire is fixed on the quartz substrate through the indium particle electrode, and the middle part of the ZnO microwire is wrapped by the perovskite shell layer. The oxygen vacancy defect states in the ZnO microwire are modulated by ultraviolet light to achieve reversible switching of positive and negative photoconductance of visible light response.

[0006] Further, the diameter of the ZnO microwire is 5-30 μm, and the length is 3000-5000 μm.

[0007] Further, the material of the perovskite shell layer is CH3NH3PbBr3, and the thickness is 300-800 nm.

[0008] Further, the indium particle electrode has a thickness of 50-100 μm and a distance between two ends of 2000-3000 μm.

[0009] Further, the ultraviolet light modulation refers to regulating the ionization state of oxygen vacancies in the ZnO microwire by changing the power density of the ultraviolet light with a wavelength of 365 nm.

[0010] Further, the reversible switching of positive and negative photoconductivity in response to visible light is specifically manifested as: When the modulation power of the ultraviolet light is lower than a first threshold value, the photocurrent in response to visible light shows a trend of continuous enhancement, which is used to simulate dark visual adaptation; When the modulation power of the ultraviolet light is between the first threshold value and a second threshold value, the photocurrent in response to visible light shows a dynamic response of first increase and then decrease, which is used to simulate bright visual adaptation; When the modulation power of the ultraviolet light is higher than the second threshold value, the photocurrent in response to visible light is lower than the background current, showing a self-inhibition trend, which is used to simulate self-protection under strong light; The first threshold value and the second threshold value are calibrated according to the power of the visible light.

[0011] In a second aspect, the present application provides a preparation method of a full-optical-control ZnO / Perovskite heterojunction biomimetic visual device, comprising the following steps: Step 1: growing ZnO microwires by using chemical vapor deposition technology; Step 2: transferring the ZnO microwires to a quartz substrate and fixing two ends as electrodes by using indium particles; Step 3: covering the electrode part by using a PDMS mask; Step 4: depositing a PbBr2 layer on the unmasked ZnO microwires by using a thermal evaporation method; Step 5: converting PbBr2 into a CH3NH3PbBr3 perovskite shell layer by chemical vapor deposition; Step 6: removing the mask to obtain a full-optical-control ZnO / Perovskite heterojunction biomimetic visual device.

[0012] In a third aspect, the present application provides an artificial visual biomimetic system, comprising a biomimetic visual device, an ultraviolet light source, a visible light source and a signal testing and processing unit; The biomimetic visual device is a full-optical-control ZnO / Perovskite heterojunction biomimetic visual device disclosed above; The ultraviolet light source is used to pre-modulate the biomimetic visual device; The visible light source is used to apply to the biomimetic visual device; The signal testing and processing unit is used to read the current signal change output by the biomimetic visual device and obtain a response curve simulating dark visual adaptation or bright visual adaptation.

[0013] In a fourth aspect, the present application provides a method for realizing visual adaptation, comprising: Step 1: pre-modulating the biomimetic visual device by applying ultraviolet light with different powers; Step 2: applying a visible light signal; Step 3: obtaining a response curve simulating dark visual adaptation or light visual adaptation by reading the current signal change output by the biomimetic visual device; The biomimetic visual device is a full-light-controlled zinc oxide / perovskite heterojunction biomimetic visual device.

[0014] In a fifth aspect, the present application provides a method for realizing visual self-protection, comprising: Step 1: pre-modulating the biomimetic visual device by applying ultraviolet light with a power higher than a second threshold value; Step 2: applying a high-intensity visible light signal on the biomimetic visual device to make the output current of the biomimetic visual device drop below the background current level, realizing a strong light blocking protection effect similar to eyelid closure; The biomimetic visual device is a full-light-controlled zinc oxide / perovskite heterojunction biomimetic visual device.

[0015] Beneficial effects: The present application provides a full-light-controlled zinc oxide / perovskite heterojunction biomimetic visual device and a preparation method thereof, which comprises: a ZnO microwire as a conductive channel, a perovskite shell layer, and an indium particle electrode, the ZnO microwire is fixed on a quartz substrate through the indium particle, and the middle part is wrapped by the perovskite shell layer; the oxygen vacancy defect state is modulated by ultraviolet light to realize reversible switching of positive and negative light responses to visible light, simulate the photopigment regeneration and bleaching process of human eyes, realize light visual and dark visual adaptation; under strong ultraviolet light modulation, the device shows a negative photoconductivity effect, simulating the self-protection mechanism of eyelid closure. The device integrates visual adaptation and protection functions in a single structure, without the need for external gate voltage or complex circuit, providing a new idea for a new generation of biomimetic visual sensors. Compared with the prior art, the present application has the following advantages: (1) The present application realizes three biomimetic visual functions of full-light-controlled light visual adaptation, dark visual adaptation and strong light self-protection in a single and simple two-terminal device, greatly improving the functional integration and biological similarity of the device; (2) The present application can flexibly switch the photoconductivity polarity of the device by adjusting only the power density of the ultraviolet modulation light, eliminating the dependence on complex external bias circuit, simplifying the system architecture, and reducing power consumption; (3) The present application uses ultraviolet light to control the ionization state of oxygen vacancies in ZnO (Vo → Vo ＋ / Vo 2＋By the competition between the carrier trapping effect induced by the trap and the intrinsic photoconductivity effect, the reversible switching between PPC and NPC is realized, and the physical mechanism is clear and controllable. (4) The CVD and thermal evaporation method used in the application are mature and controllable processes, and are easy to repeat and mass produce, which lays a foundation for future construction of functional biomimetic visual array. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A preparation flowchart of the all-optical control zinc oxide / perovskite heterojunction biomimetic visual device is provided for the embodiments of the application. Figure 2 A schematic diagram and an optical micrograph of the all-optical control zinc oxide / perovskite heterojunction biomimetic visual device are provided for the embodiments of the application. Figure 3 The response curve (I-t) of the all-optical control zinc oxide / perovskite heterojunction biomimetic visual device to fixed power visible light (520 nm, 86 μW / cm²) under different ultraviolet modulation powers is provided for the embodiments of the application, which shows the transition from PPC to NPC. Figure 4 A carrier dynamics process schematic diagram of the all-optical control zinc oxide / perovskite heterojunction biomimetic visual device under different ultraviolet light conditions is provided for the embodiments of the application. Figure 5 Based on the modulation light power dependence and time dependence of the artificial retina photosensitive pigment behavior of the ZnO / CH3NH3PbBr3 heterojunction device, a sensing and light-dark adaptation function system schematic diagram of the artificial retina is constructed, wherein, Figure 5 a and c in the figure are test system schematic diagrams for simulating dark vision adaptation and light vision adaptation, respectively. Figure 5 b and d in the figure are time-dependent light response curves for simulating dark vision adaptation and light vision adaptation, respectively. Figure 5 e and f in the figure are time evolution graphs of the corresponding gray scale images for simulating dark vision adaptation and light vision adaptation, respectively. Figure 5 g in the figure is a self-protection function demonstration graph of the all-optical control zinc oxide / perovskite heterojunction biomimetic visual device. DETAILED DESCRIPTION

[0017] Negative photoconductivity (NPC) is opposite to the behavior of positive photoconductivity (PPC) that enhances photocurrent. NPC can inhibit photocurrent under certain conditions, which provides the possibility for simulating the adaptive inhibition and self-protection mechanism of biological vision under strong light. By effectively utilizing the synergy and switching of NPC and PPC, dynamic adjustment of visual sensitivity and light intensity overload protection can be realized at a single device level, and a powerful intelligent visual sensor can be constructed.

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application with reference to the accompanying drawings and embodiments.

[0019] Embodiment one: The present application provides a full light-controlled ZnO / Perovskite heterojunction biomimetic vision device, which comprises a quartz substrate, a ZnO microwire as a conductive channel, a perovskite shell layer wrapped on the ZnO microwire, and indium particles as electrodes. The ZnO microwire is fixed on the quartz substrate by the indium particles at both ends; the perovskite shell layer covers the middle section of the ZnO microwire.

[0020] Specifically, in the present application, the diameter of the ZnO microwire is 5-30 μm, and the length is 3000-5000 μm. The perovskite shell layer is CH3NH3PbBr3, and the thickness is 300-800 nm. The thickness of the indium particle is 50-100 μm, and the distance between the two end indium particles is 2000-3000 μm.

[0021] The positive and negative photoconductivity reversible switching of the visible light response is realized by modulating the oxygen vacancy defect state with ultraviolet light. The ultraviolet light modulation of the present application refers to regulating the ionization state of the oxygen vacancy in ZnO by changing the power density of 365 nm ultraviolet light; the wavelength range of visible light is 450-540 nm. The positive and negative photoconductivity reversible switching specifically shows that: When the ultraviolet modulation power is lower than the first threshold value, the photocurrent of the device to visible light shows a continuous enhancement trend, which is used to simulate the dark vision adaptation. That is, under no or very weak ultraviolet light modulation, the present application device shows a continuous enhancement of positive photoconductivity effect to visible light, simulates the visual pigment regeneration process of human eye in dark environment, and realizes the Scotopic Adaptation.

[0022] When the ultraviolet modulation power is between the first threshold value and the second threshold value, the photogenerated current of the device to visible light presents a dynamic response of first increase and then decrease, for simulating photopic adaptation. That is, under the modulation of medium-intensity ultraviolet light, the photogenerated current of the device to visible light first reaches a peak and then slowly decreases, simulating the process of visual pigment bleaching and retinal sensitivity reduction of the human eye in a bright environment, to realize photopic adaptation.

[0023] When the ultraviolet modulation power is higher than the second threshold value, the photogenerated current of the device to visible light is lower than the background current, presenting a self-inhibition trend, for simulating self-protection under strong light. That is, under the modulation of strong ultraviolet light, the device of the embodiment of the present application exhibits a significant negative photoconductive effect to visible light, and the photogenerated current thereof decreases to be lower than the initial background current level, simulating the eyelid closure self-protection mechanism triggered by the human eye under extremely strong light stimulation.

[0024] The first threshold value and the second threshold value need to be calibrated according to the power of visible light.

[0025] Embodiment two: As shown in Figure 1 The present embodiment proposes a preparation method of a full-light-controlled zinc oxide / perovskite heterojunction biomimetic vision device, comprising the following steps: Step 1: ZnO microwires are grown by using chemical vapor deposition technology; ZnO powder and carbon powder are mixed in a mass ratio of 1:1, and are placed in the center of the heating zone of a high-temperature tube furnace, and are reacted at 1050°C for 2 hours by using argon (150 sccm) and oxygen (15 sccm) as carrier gas and reaction gas, to collect the generated ZnO microwires on the downstream silicon wafer.

[0026] Step 2: Under the operation of a microscope, a single ZnO microwire (diameter ~10 μm, length ~5 mm) is picked up and transferred to a clean quartz substrate. Two small indium particles (diameter ~500 μm) are taken by using a fine tweezers, and the two ends of the microwire are crimped and fixed on the quartz substrate with a electrode spacing of about 2.5 mm. The sample is placed on a 170°C hot stage for heating for 2 minutes, so that the indium is melted and forms a good contact with the ZnO, and is fixed after cooling.

[0027] Step 3: A mask sheet is made by cutting a PDMS sheet, to cover the two indium electrodes. The sample is placed into a thermal evaporation film plating machine, and a 4×10 -4A thin film of PbBr2was formed on the exposed ZnO channel region by evaporating PbBr2at a rate of 1 Å / s under high vacuum of Pa for 50 min. Subsequently, the sample was placed downstream of the CVD tube furnace, and the upstream crucible of CH3NH3Br powder was heated to 115 °C. The PbBr2was allowed to react with the CH3NH3Br vapor for 70 min with Ar as the carrier gas to completely convert into CH3NH3PbBr3shell.

[0028] Step 4: The PDMS mask was carefully removed, and a ZnO / CH3NH3PbBr3core-shell heterojunction-based all-optical artificial vision device was prepared.

[0029] Example Three: The embodiment of the present application provides an artificial vision bionic system, which comprises the all-optical zinc oxide / perovskite heterojunction bionic vision device, the ultraviolet light source, the visible light source and the signal testing and processing unit.

[0030] Example Four: The embodiment of the present application provides a method for realizing visual adaptation, which is applied to the all-optical zinc oxide / perovskite heterojunction bionic vision device, and the method comprises the following steps: Step 1: The device is pre-modulated by applying ultraviolet light with different powers; Step 2: A visible light signal is applied; Step 3: The response curve of simulated dark visual adaptation or bright visual adaptation is obtained by reading the current signal change of the device output.

[0031] Example Five: The embodiment of the present application provides a method for realizing visual self-protection, which is applied to the all-optical zinc oxide / perovskite heterojunction bionic vision device, and the method comprises the following steps: Step 1: The device is pre-modulated by applying high-intensity ultraviolet light; Step 2: A high-intensity visible light signal is applied; Step 3: The output current of the device is suddenly reduced to below the background current level, realizing the strong light blocking protection effect similar to eyelid closing.

[0032] A photoelectric test system was built using a semiconductor parameter analyzer (Keithley 4200-SCS) and a 365 nm ultraviolet LED and a 520 nm visible continuous laser, as shown in Figure 2 Under different ultraviolet modulation powers, the response curve (I-t) of the device provided by any one of the embodiments of the present application to a fixed-power visible light (520 nm, 86 μW / cm²) is as shown in Figure 3The response current of the device to visible light gradually increases over time under no or ultra-low power UV modulation, which can simulate the regeneration function of sensory pigments. When the UV modulation light power increases to 0.31 μW / cm 2 , the photoelectric current value of the device rapidly reaches a steady state value. When the UV modulation light power reaches 0.37 μW / cm 2 , the device photoelectric current presents a slight downward trend after reaching a peak value. When the UV modulation light power reaches 3.40 μW / cm 2 , the device photoelectric current gradually decreases after rapidly reaching a peak value, which can simulate the bleaching function of light-sensitive pigments. When the UV modulation light power exceeds 8.10 μW / cm 2 , the device photoelectric current gradually decreases after rapidly reaching a peak value and eventually is lower than the background current at 0s, presenting an abnormal negative photoconductivity phenomenon.

[0033] The embodiment of the present application realizes flexible regulation of the photoconductivity behavior of the device under visible light (520 nm) irradiation by modulating the oxygen vacancy defect state in ZnO under UV light (365 nm), and further realizes the coordination and reversible switching of PPC and NPC effects, and the kinetic process is as shown in Figure 4 . Under no or ultra-weak UV light modulation, due to the low conductivity of ZnO, long distance transmission channel, and dynamic adsorption and desorption of oxygen molecules on the surface, the photoelectric current gradually increases over time, presenting a persistent photoconductivity effect. Under moderate UV light irradiation, a small amount of ground state oxygen vacancies ionize to form electron trap states. When visible light is irradiated, the photo-generated electrons in the CH3NH3PbBr3 shell inject into the ZnO channel, and the photoelectric current rapidly reaches a peak value, accompanied by the capture effect of ionized oxygen vacancies on photo-generated electrons, and the photoelectric current gradually decreases after the peak value. Under strong UV light irradiation, a large amount of ground state oxygen vacancies ionize to form electron trap states. When visible light is irradiated, the photo-generated electrons in the CH3NH3PbBr3 shell inject into the ZnO, and the photoelectric current rapidly reaches a peak value, accompanied by the capture effect of a large amount of ionized oxygen vacancies at the interface on photo-generated electrons, and the photoelectric current rapidly decreases and eventually is lower than the background current, presenting a negative photoconductivity. In general, the change in the polarity of the photoconductivity of the device is the result of the competition between the trap capture effect and the intrinsic photoconductivity effect.

[0034] Based on the modulation light power dependence and time dependence of the artificial retina sensory pigment behavior of the ZnO / CH3NH3PbBr3 core-shell heterojunction device, a sensing and light-dark adaptation function system of the artificial retina is constructed, as shown in Figure 5 . Here, a 3x3 pixel movable template with a letter "X" pattern is placed in front of the visible light source to realize image sensing. Light can pass through the transparent pixel points in the template and be blocked by the non-transparent pixel points. As shown in Figure 5 , in the light-dark adaptation test, the device is under a power of 0.26 μW / cm2 2.6 μW / cm 2 of visible light. When the template moved to the transparent pixel, the device was exposed to 13.0 μW / cm 2 of weak visible signal light. Under 0.26 μW / cm 2 UV (365 nm) modulation, the time-dependent optical response of the device to 2.6 μW / cm 2 and 13.0 μW / cm 2 visible light (520 nm) is shown in b of FIG. 1 Figure 5 For consistency in perception, the output current of 0.143 nA was defined as gray level 0, and 0.200 nA as gray level 255. Figure 5 The time evolution of the image during dark adaptation is shown in e of FIG. 1 signal Due to the weak light intensity, the "X" pattern was difficult to identify at the beginning, and the image became clear with time, similar to the dark adaptation process of the human eye retina. The image contrast (C) was defined as the gray level difference between the signal pixel (G background ) and the background pixel (G signal ), and C = G background During dark adaptation, the contrast of the image gradually increased from 0 s (0) to 1 s (54), 2 s (134), 3 s (183), 4 s (215), and 5 s (242).

[0035] As shown in c of FIG. 1 Figure 5 , in the bright adaptation test, the device was under UV modulation with a power of 16.30 μW / cm 2 , and the background noise was 1.3 mW / cm 2 of visible light. When the template moved to the transparent pixel, the device was exposed to 6.0 mW / cm 2 of strong visible signal light. Under 16.30 μW / cm 2 UV (365 nm) modulation, the time-dependent optical response of the device to 1.3 mW / cm 2 and 16.0 mW / cm 2 visible light (520 nm) is shown in d of FIG. 1 Figure 5 At this time, the output current of 26.00 to 26.84 nA was defined as gray level 0 to 255. Figure 5f in the figure illustrates the temporal evolution of the image during light adaptation. Due to the high light intensity, there is a dazzling effect at the beginning, and nothing can be seen clearly. As time goes by, the image gradually becomes clearer, and the contrast of the image gradually increases from 1s (0) to 2s (20), 3s (84), 4s (159), and 5s (235), which is similar to the light adaptation process of the human eye retina.

[0036] like Figure 5 As shown in g, at a power of 128.80 μW / cm 2 Under ultraviolet light modulation, when the strong light power is 20 mW / cm 2 When 532 nm light shines on the device, the response current not only does not increase, but drops sharply below the background current, exhibiting an intelligent self-inhibition state. This behavior, which is completely opposite to that of conventional photoconductivity, can simulate the function of an eyelid actively closing under strong light. When the strong light signal is removed, the device's conductivity does not immediately jump back to its initial state, but exhibits a slow recovery trajectory. This dynamic process accurately simulates the cautious behavior of a biological eyelid "slowly opening" after the removal of strong light.

Claims

1. An all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device, characterized in that: Comprising: a ZnO microwire as a conductive channel, a perovskite shell, an indium particle electrode and a quartz substrate, the ZnO microwire is fixed on the quartz substrate by the indium particle electrode, and the middle part of the ZnO microwire is wrapped by the perovskite shell; The oxygen vacancy defect state in the ZnO microwire is modulated by ultraviolet light to realize reversible switching of positive and negative photoconductivity in response to visible light.

2. The all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device according to claim 1, characterized in that: The diameter of the ZnO microwire is 5-30 μm, and the length is 3000-5000 μm.

3. The all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device according to claim 1, wherein: The material of the perovskite shell is CH3NH3PbBr3, and the thickness is 300-800 nm.

4. The all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device of claim 1, wherein: The thickness of the indium particle electrode is 50-100 μm, and the distance between the two ends is 2000-3000 μm.

5. The all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device of claim 1, wherein: The ultraviolet light modulation refers to regulating the ionization state of the oxygen vacancy in the ZnO microwire by changing the power density of the ultraviolet light with a wavelength of 365 nm.

6. The all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device of claim 1, wherein: The reversible switching of positive and negative photoconductivity in response to visible light is specifically manifested as: When the modulation power of the ultraviolet light is lower than the first threshold value, the photocurrent in response to visible light shows a trend of continuous enhancement, which is used to simulate dark visual adaptation; When the modulation power of the ultraviolet light is between the first threshold value and the second threshold value, the photocurrent in response to visible light shows a dynamic response of first increase and then decrease, which is used to simulate bright visual adaptation; When the modulation power of the ultraviolet light is higher than the second threshold value, the photocurrent in response to visible light is lower than the background current, showing a self-inhibition trend, which is used to simulate self-protection under strong light; The first threshold value and the second threshold value are calibrated according to the power of the visible light.

7. A method for preparing an all-optically controlled ZnO / Perovskite heterojunction biomimetic vision device, characterized in that, Comprising the following steps: Step 1: growing a ZnO microwire by chemical vapor deposition technology; Step 2: transferring the ZnO microwire to a quartz substrate and fixing the two ends as electrodes with indium particles; Step 3: covering the electrode part with a PDMS mask; Step 4: depositing a PbBr2 layer on the unmasked ZnO microwire using a thermal evaporation method; Step 5: converting PbBr2 into a CH3NH3PbBr3 perovskite shell by chemical vapor deposition; Step 6: removing the mask to obtain the full light-controlled ZnO / perovskite heterojunction biomimetic visual device of any one of claims 1 to 6.

8. An artificial vision biomimetic system, characterized by, Comprising: a biomimetic visual device, an ultraviolet light source, a visible light source, and a signal testing and processing unit; the biomimetic visual device is the full light-controlled ZnO / perovskite heterojunction biomimetic visual device of any one of claims 1 to 6; the ultraviolet light source is used to pre-modulate the biomimetic visual device; the visible light source is used to apply to the biomimetic visual device; the signal testing and processing unit is used to read the current signal change output by the biomimetic visual device to obtain the response curve simulating dark visual adaptation or bright visual adaptation.

9. A method of enabling visual accommodation, characterized by, Comprising: Step 1: pre-modulating the biomimetic visual device by applying ultraviolet light with different powers; Step 2: applying a visible light signal; Step 3: obtaining the response curve simulating dark visual adaptation or bright visual adaptation by reading the current signal change output by the biomimetic visual device; the biomimetic visual device is the full light-controlled ZnO / perovskite heterojunction biomimetic visual device of any one of claims 1 to 6.

10. A method of enabling visual self-protection, characterized by, Comprising: Step 1: pre-modulating the biomimetic vision device by applying ultraviolet light higher than the second threshold intensity; Step 2: applying a high-intensity visible light signal on the biomimetic vision device, so that the output current of the biomimetic vision device drops suddenly below the background current level, realizing the strong light blocking protection effect similar to eyelid closure; The biomimetic vision device is the all-optical-controlled zinc oxide / perovskite heterojunction biomimetic vision device according to any one of claims 1 to 6.

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