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Two-dimensional double-layer DJ type lead-bromine hybrid perovskite as well as preparation method and application thereof

A perovskite material, double-layer technology, applied in the field of photoelectric detection, can solve problems such as poor stability, and achieve the effects of easy film formation, simple preparation process and low cost

Inactive Publication Date: 2022-03-18
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem of poor stability (to humidity, light, and heat) of current materials (hybrid perovskite constructed by aliphatic amines), and the blank problem in the field of photoelectric detection in the near-infrared region of two-dimensional hybrid perovskite materials, the present invention Provided is a two-dimensional double-layer DJ-type lead-bromine hybrid perovskite material, its preparation method and its photoelectric detection application in the near-infrared region

Method used

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  • Two-dimensional double-layer DJ type lead-bromine hybrid perovskite as well as preparation method and application thereof
  • Two-dimensional double-layer DJ type lead-bromine hybrid perovskite as well as preparation method and application thereof
  • Two-dimensional double-layer DJ type lead-bromine hybrid perovskite as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Pb(AC) 2 ·3H 2 O (9 mmol) was dissolved in 10 mL (48 wt.%) of HBr solution. Subsequently, 0.05 mol of ethylamine and 3.5 mmol of 3-aminomethylpyridine were added to the solution to obtain a yellow precipitate. After heating to boiling, a clear yellow solution was obtained. The above solution is gradually lowered from 75°C to 25°C at a rate of 1°C per day, and (3AMPY)EAPb can be obtained after 25 days 2 Br 7 Large size single crystal. The crystal structure was obtained by X-ray single crystal diffractometer analysis, such as figure 1 shown.

Embodiment 2

[0030] (3AMPY)EAPb 2 Br 7 Analysis of light absorption ability of crystal materials:

[0031] Synthesized organic-inorganic hybrid (3AMPY)EAPb by ultraviolet-visible (UV-Vis) absorption spectroscopy 2 Br 7 The light-absorbing property analysis of the crystal material shows that the absorption cut-off edge of the crystal can reach 450nm ( image 3 ), direct bandgap, (E g ) is ~2.73eV.

Embodiment 3

[0033] (3AMPY)EAPb 2 Br 7 Analysis of photodetection performance of crystal materials in the 405nm band:

[0034] In the dark state without light, (3AMPY)EAPb 2 Br 7 The dark current of single crystal devices is as low as 6.49*10 -11 A(V bias =10V), indicating that the intrinsic carrier concentration of the compound is very low, reflecting the high quality of the crystal material. And under 405nm light, the study of (3AMPY)EAPb 2 Br 7 Photocurrent and photoresponse curves of single crystal devices. The final conclusion is that (3AMPY)EAPb 2 Br 7 The device operates at an optical power of 94.5mW / cm 2 , the photocurrent can reach 8.15*10 -7 A, switch ratio up to 10 4 . This result is also enough to show that the crystal is an excellent material for photodetection.

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Abstract

The invention discloses a DJ type two-dimensional double-layer lead-bromine hybrid perovskite as well as a preparation method and application thereof, and belongs to the technical field of photoelectric detection. Aiming at the problems of poor overall thermal stability and poor light stability of the material caused by hybrid perovskite constructed by using aliphatic amine in the prior art, the stability of the two-dimensional double-layer DJ type lead-bromine hybrid perovskite material disclosed by the invention is greatly improved by using interlayer aromatic amine cations. The material can be prepared by a solution method, is simple in preparation process, can be synthesized usually at low temperature, is easy to form a film, and has the advantages of relatively good performance and relatively low cost when being applied to a photovoltaic material and a photoelectric device. The obtained (3-aminomethylpyridine) (ethylamine) Pb2Br7 crystal material not only can realize visible light photoelectric detection under 405nm, but also can realize photoelectric detection in a near-infrared (800nm) region through a two-photon absorption technology. Therefore, the hybrid perovskite has wide prospects in the fields of optical fiber communication, military safety, photoelectric coupling and the like.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a two-dimensional double-layer DJ type lead-bromine hybrid perovskite, a preparation method and an application. Background technique [0002] Conventional inorganic oxide semiconductors face problems such as large bandgap (narrow absorption range) and poor electrical conductivity, which severely restrict their development in the field of optoelectronics. The emerging organic-inorganic hybrid perovskite materials are widely used in optoelectronics and photovoltaics due to their high light absorption coefficient (high two-photon absorption coefficient), low crystal defect density, long carrier transport distance, and adjustable band gap. field. Especially low-dimensional hybrid perovskite materials have rich structural diversity, which provides a broad space for designing photodetection materials with excellent semiconductor properties. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/38C07C211/05C07C209/00H01L51/42
CPCC07D213/38C07C211/05C07C209/00C07B2200/13H10K30/10Y02E10/549
Inventor 符冬营
Owner SHANXI UNIV
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