Method for improving performance of flexible photoelectric detector

A photodetector and flexible technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of easy leakage and large volume, and achieve the effects of low cost, enhanced photocurrent, and simple manufacturing process

Pending Publication Date: 2022-03-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, because the traditional photoelectrochemical photodetector uses electrolyte as the conductive medium, it has the disadvantages of large volume and easy leakage, which makes its practical application have many limitations.

Method used

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  • Method for improving performance of flexible photoelectric detector
  • Method for improving performance of flexible photoelectric detector
  • Method for improving performance of flexible photoelectric detector

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for improving the performance of a flexible photodetector, wherein the flexible photodetector is a photoelectrochemical photodetector with a solid electrolyte as a conductive medium, comprising the following steps:

[0039] 1) Soak and clean the PET film with acetone and absolute ethanol successively for 15 minutes and dry to obtain a pure sample;

[0040] 2) Dissolve 200 mg of molybdenum disulfide powder in 80 ml of N-methyl-2-pyrrolidone solution and perform ultrasonic treatment for 24 hours. After the ultrasonic treatment, wash twice with acetone, absolute ethanol, and deionized water, each time for 30 minutes. Finally, the wet powder was dried at -45°C for 24 hours to obtain a gray-black two-dimensional molybdenum disulfide nanosheet sample;

[0041] 3) Take 5 mg of superconducting carbon black, add 10 ml of N-methyl-2-pyrrolidone solution, and perform ultrasonic treatment for 30 minutes to obtain a uniform carbon black solution with a concentration of 0.5...

Embodiment 2

[0052] With a kind of method for improving flexible photodetector performance described in embodiment 1, difference is:

[0053] In step 5), 3 g of polyvinyl alcohol was added to 30 ml of deionized water, and magnetically stirred at a temperature of 95° C. for 30 min to obtain a uniform and transparent solid electrolyte. Use directly after cooling at room temperature for 6 hours.

[0054] Figure 5 Time-current curves for the fabrication of flexible photodetectors without NADPH addition in solid electrolyte. From the figure we can see that the photodetector exhibits 0.2μA / cm 2 The photocurrent density of the image 3 This is because the addition of NADPH can effectively inhibit the recombination of photogenerated carriers and greatly improve the performance of photodetectors.

Embodiment 3

[0056] With a kind of method for improving flexible photodetector performance described in embodiment 1, difference is:

[0057] In step 5), 3 g of polyvinyl alcohol was added to 30 ml of deionized water, and magnetically stirred at a temperature of 95° C. for 30 min to obtain a uniform and transparent solid electrolyte. Cool at room temperature for 6 hours, add 5 mg of NADPH powder, and continue stirring at room temperature for 30 minutes to obtain a solid electrolyte with NADPH added.

[0058] Figure 6 Time-current curves for the preparation of flexible photodetectors with the addition of 5 mg NADPH in solid electrolyte. From the figure we can see that the photodetector exhibits 0.35μA / cm 2 The photocurrent density of the image 3 This is because as the mass of NADPH increases, the ability to suppress photogenerated carriers also increases, which can further improve the performance of the photodetector.

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Abstract

According to the method for improving the performance of the flexible photoelectric detector, the characteristic that reduced nicotinamide adenine dinucleotide phosphate (NADPH) has high reducibility is utilized, and the reduced nicotinamide adenine dinucleotide phosphate (NADPH) serves as an additive to be used in the preparation process of solid electrolyte, so that the performance of the flexible photoelectric detector is improved. When incident light irradiates on the photoelectric detector, NADPH as an efficient hole transfer medium can effectively inhibit recombination of electron holes in an electrochemical system. According to the method, the NADPH is used as the additive for improving the performance of the flexible photoelectric detector for the first time, the photocurrent density of the device can be remarkably improved, the manufacturing process is simple, the cost is low, the method can be used for large-scale preparation, and the application prospect of the device is further widened.

Description

Technical field: [0001] The invention belongs to the field of photoelectrochemical detection, in particular to a method for improving the performance of a flexible photodetector. Background technique: [0002] As a sensor that converts light signals into electrical signals that can be received and processed, photodetectors are widely used in fields such as solar power generation, biomedicine, environmental monitoring, and remote control. Photoelectrochemical photodetector is a new type of photodetector, and its working principle is based on the mechanism of semiconductor-liquid contact. When the semiconductor is in contact with the liquid, the electrons and holes are separated under the action of the built-in electric field formed at the interface. Therefore, the photoelectrochemical photodetector can produce a higher current response and a faster response speed without an externally applied power supply. It can still work stably even in emergencies such as emergency power ...

Claims

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Application Information

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IPC IPC(8): G01N27/416
CPCG01N27/416
Inventor 祁祥周阳黄宗玉
Owner XIANGTAN UNIV
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