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A perovskite visible light detector with energy band gradient and its preparation method

A perovskite and visible light technology, applied in the field of visible light detection, can solve the problems of high dark flow and low responsivity of perovskite visible light detectors, achieve the effect of increasing visible light energy, improving responsivity, and overcoming interface defects

Active Publication Date: 2020-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a perovskite visible light detector with energy band gradient and its preparation method in order to solve the problems of high dark flux and low responsivity of perovskite visible light detectors

Method used

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  • A perovskite visible light detector with energy band gradient and its preparation method
  • A perovskite visible light detector with energy band gradient and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A perovskite visible light detector with energy band gradient, such as figure 1 As shown, including bottom-up light reflection layer 1, glass substrate, transparent conductive electrode layer 2, hole transport layer 3, perovskite sensitive layer 4, electron transport layer 5, hole blocking layer 6 and metal electrode layer 7. Among them, the light reflection layer 1 adopts silver with a thickness of 100nm, the transparent conductive electrode layer 2 adopts an ITO transparent conductive electrode with a thickness of 150nm, the hole transport layer 3 adopts a PEDOT:PSS film with a thickness of 90nm, and the perovskite sensitive layer 4 adopts CH with a thickness of 250 nm 3 NH 3 PB 3 、CH 3 NH 3 Pb(I .087 Br 0.13 ) 3 、CH 3 NH 3 Pb(I .08 Br 0.2 ) 3 Films with different energy bands, the electron transport layer 5 adopts PC with a thickness of 70nm 61 BM film, the hole transport layer 3 adopts C with a thickness of 150nm 60 Thin film, metal electrode layer 7 ...

Embodiment 2

[0051] On the basis of Example 1, the perovskite sensitive layer 4 was prepared by a spraying process. The specific steps were to use three spray guns to spray the perovskite precursor solution on the substrate respectively. The spraying time was 20s, and then annealed at 100°C. Processing time is 10min.

[0052] Under standard test conditions, the light beam is drawn from the visible light source, so that the incident light 8 obliquely enters the perovskite visible light detector. The test results show that the perovskite visible light detector responds to the 350-800nm ​​band, and its detection rate is ~10 10 Jones. Among them, under the condition of -2V reverse bias, the light intensity at this time is 2mW / cm 2 For visible light, the measured responsivity of the perovskite visible light detector is 5.5A / W.

Embodiment 3

[0054] On the basis of Example 1, methylamine lead iodide and methylamine lead bromide are dissolved in DMF (N-N dimethylformamide) solution according to the molar ratio of 1:1, 0.7:0.3, 0.6:0.4, at 100 ° C After stirring for 6 h, the perovskite precursor solution was obtained.

[0055] Under standard test conditions, the light beam is drawn from the visible light source, so that the incident light 8 obliquely enters the perovskite visible light detector. The test results show that the perovskite visible light detector responds to the 350-800nm ​​band, and its detection rate is ~10 8 Jones. Among them, under the condition of -2V reverse bias, the light intensity at this time is 2mW / cm 2 For visible light, the measured responsivity of the perovskite visible light detector is 3.1A / W.

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Abstract

The invention discloses a perovskite visible light detector with an energy band gradient and a preparation method thereof. The perovskite visible light detector sequentially comprises a light reflection layer, a glass substrate, a transparent conductive electrode layer, and a hole transport layer from bottom to top. , perovskite sensitive layer, electron transport layer, hole blocking layer and metal electrode layer. The perovskite sensitive layer includes perovskite polycrystalline films with different energy band widths arranged side by side. By preparing the perovskite sensitive layer with an energy band gradient, the dark current of the visible light detector is effectively reduced, the responsivity of the device is improved, and the detection rate of the visible light detector is improved. The perovskite visible light detector prepared based on it has lower cost, the preparation method is simple and efficient, and can be produced on a large scale.

Description

technical field [0001] The invention belongs to the field of visible light detection, in particular to a perovskite visible light detector with energy band gradient and a preparation method thereof. Background technique [0002] A photodetector is a device that detects and measures the properties of light through the photoelectric effect, usually manifested as a photocurrent. The photoelectric conversion properties of detectors are widely used in various fields, including image sensing, optical communication, environmental monitoring and chemical / biological detection, etc. At present, photodetectors are mainly made of inorganic semiconductors. Photodetectors based on GaN, Si and InGaAs semiconductor materials correspond to three important detection bands: ultraviolet light (0.25-0.4mm), visible light (0.45-0.8mm ) and near infrared (0.9-1.7mm). Although the photodetector manufacturing process and technology have become mature and reliable, its complex fabrication process, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K30/151H10K30/152H10K30/00Y02E10/549
Inventor 黄江向思衡何磊王子君
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA