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Ultra-wide spectrum light detector

A photodetector and ultra-broadband technology, applied in the field of optoelectronics, can solve the problems of complex structure of broadband photodetection system and few broadband photodetectors, and achieve novel structure, wide range of detection spectrum and simple preparation Effect

Active Publication Date: 2017-08-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to achieve wide-spectrum detection, multiple detectors suitable for detecting different wavelength bands are integrated together, and to ensure that these detectors work synchronously, resulting in a complex structure of the wide-spectrum optical detection system
[0003] A lot of research work has been devoted to broadband photodetectors. At present, the detection spectrum width of most broadband photodetectors can cover from ultraviolet to visible light, or from visible light to near infrared, and few can cover from ultraviolet to terahertz. Broad Spectrum Photodetector

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0049] Preparation of self-supporting reduced graphene oxide films as photosensitive materials:

[0050] Disperse graphene oxide in ethanol by ultrasound for 2-4 hours to prepare a 0.2-1.0 mg / mL graphene oxide ethanol dispersion, which is divided into 6 cycles and drip-coated on an area of ​​1.8×1.5cm 2 On the silicon nanowire array, each cycle is divided into 3 times of drop coating, each time according to 25 ~ 35μL / cm 2 Slowly drip-coat the dispersion, and after each cycle, put it in an oven at 60°C for 3 minutes until dry, and then proceed to the next cycle; dry the above-mentioned sample that has been drip-coated naturally in the air; in 5% hydrogen and 95% Under the protection of argon atmosphere, keep the pressure at 84Pa and heat treatment at 200°C for 3 hours to prepare a self-supporting reduced graphene oxide film with the same area and shape as the silicon nanowire array.

[0051] Fabrication of ultra-broadband photodetectors:

[0052] First, fix the self-supportin...

Embodiment 2

[0056] The same experimental procedure as in Example 1 was used to fabricate the detector, except that the heat treatment temperature for preparing the self-supporting reduced graphene oxide film was 400°C.

[0057] The real photo of the detector is as figure 1 Shown in (b).

[0058] The detection performance of the detector from ultraviolet to terahertz is as follows: Figure 2-9 As shown, the results show that compared with the dark state, the response signal of the detector to light is characterized by an increase in current, a stable signal, and good reproducibility. Light detection from ultraviolet to terahertz can be achieved, and the detector response time and recovery The time is on the order of hundreds of milliseconds. However, the photoresponsivity of this detector is lower than that of the self-supporting reduced graphene oxide film detector prepared by heat treatment at 200°C, as shown in Table 1.

Embodiment 3

[0060] The same experimental procedure as in Example 1 was used to fabricate the detector, except that the heat treatment temperature for preparing the self-supporting reduced graphene oxide film was 600°C.

[0061] The real photo of the detector is as figure 1 Shown in (c).

[0062] The detection performance of the detector from ultraviolet to terahertz is as follows: Figure 2-9 As shown in Table 1, the results show that, compared with the dark state, the response signal value of the detector to light is almost zero or the signal shows that the current increases but the value is small. Therefore, it is considered that the self-supporting reduction of Graphene oxide thin film detectors are poor for detection from ultraviolet to terahertz.

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Abstract

The invention discloses an ultra-wide spectrum light detector. The detector comprises light-sensitive material and an electrode. The light-sensitive material is a self-supporting reduced graphene oxide film. The electrode is metal. The structure of the detector is that the self-supporting reduced graphene oxide film is enabled to be in the suspension state, and the metal electrode is connected with the reduced graphene oxide film. The detector works in the room temperature air; the detection spectrum range is wide so that detection from the range of ultraviolet to terahertz spectrum can be realized; the detector has fast response speed of milliseconds for all the spectrum from ultraviolet to terahertz; and preparation is easy, the cost is low and the prospect is wide in actual application.

Description

technical field [0001] The invention relates to the technical field of optoelectronics, and more specifically, to an ultra-wide-spectrum photodetector. Background technique [0002] Broad-spectrum light detection has extensive and important applications in infrared imaging, remote sensing, astronomical detection, spectral analysis and other fields. At present, in order to realize wide-spectrum detection, multiple detectors suitable for detecting different wavelength bands are integrated together, and these detectors are guaranteed to work synchronously, resulting in a complex structure of the wide-spectrum optical detection system. [0003] A lot of research work has been devoted to broadband photodetectors. At present, the detection spectrum width of most broadband photodetectors can cover from ultraviolet to visible light, or from visible light to near infrared, and few can cover from ultraviolet to terahertz. Broad Spectrum Photodetector. [0004] Focusing on this, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/101H01L31/18
CPCH01L31/101H01L31/18Y02P70/50
Inventor 贺军辉曹阳孙家林杨花
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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