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DJ-type methylamine-free narrow-band-gap two-dimensional double-layer hybrid perovskite material and preparation method thereof

A perovskite material and narrow bandgap technology, applied in the field of photoelectric detection, can solve the problems of wide bandgap, poor light stability and poor thermal stability of materials, and achieve the effects of improved stability, low cost and high thermodynamic stability

Pending Publication Date: 2021-10-29
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems in the prior art that the use of methylamine cations leads to poor overall thermal stability and light stability of the material, and the use of methylamine cations leads to the wide band gap of the material, the present invention provides a DJ-type methylamine-free narrow-bandgap two-dimensional double-layer hybrid calcium titanium Mineral material and its preparation method and application

Method used

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  • DJ-type methylamine-free narrow-band-gap two-dimensional double-layer hybrid perovskite material and preparation method thereof
  • DJ-type methylamine-free narrow-band-gap two-dimensional double-layer hybrid perovskite material and preparation method thereof
  • DJ-type methylamine-free narrow-band-gap two-dimensional double-layer hybrid perovskite material and preparation method thereof

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Effect test

Embodiment 1

[0027] Pb(AC) 2 ·3H 2 O (4.5 mmol) was dissolved in 10 mL (45 wt.%) of HI solution. Subsequently, 3 mmol of formamidine acetate and 0.7 mmol of 3-aminomethylpyridine were added to the solution to obtain a red-black powder 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 2°C per day, and (3AMPY)FAPb can be grown at room temperature after 10 days. 2 I 7 Large size single crystal. The crystal structure was obtained by X-ray single crystal diffractometer analysis, such as figure 1 shown.

Embodiment 2

[0029] (3AMPY)FAPb 2 I 7 Analysis of light absorption ability of crystal materials:

[0030] Synthetic organic-inorganic hybrid (3AMPY) FAPb 2 I 7 The crystal material is analyzed by ultraviolet-visible (UV-Vis) absorption spectrum to analyze its basic optical properties and ultraviolet-visible absorption spectrum, and the results show that the absorption cut-off edge of the crystal can reach 832nm ( image 3 ), the indirect bandgap (E g ) is ~1.47eV, which is close to the theoretical result of the first-principles density functional theory (DFT) ( Figure 4 ), indicating that (3AMPY)FAPb 2 I 7 Crystal material is a kind of narrow bandgap semiconductor material, which can be used for wideband photodetection.

Embodiment 3

[0032] (3AMPY)FAPb 2 I 7 Analysis of photodetection performance of crystal materials in different bands:

[0033] In the dark state without light, (3AMPY)FAPb 2 I 7 The dark current of monocrystalline devices is as low as 2.9*10 -10 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 in different bands, such as 405nm ( Figure 5 a), 520nm ( Figure 5 b), 637nm ( Figure 5 c) and 780nm ( Figure 5 d) Under the light of the light, (3AMPY)FAPb was studied 2 I 7 Photocurrent and photoresponse curves of single crystal devices. The final conclusion is that (3AMPY)FAPb 2 I 7 The device has the best performance under the light with a wavelength of 637nm, and the optical power is 41mW / cm 2 , the photocurrent can reach 9*10 -6 A, switch ratio up to 3*10 4 . This result is also sufficient to show that this wavelength-dependent photoresponse behavior is closely related to i...

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Abstract

The invention discloses a DJ-type methylamine-free narrow-band-gap two-dimensional double-layer hybrid perovskite material and 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 a material caused by use of methylamine cations and wide band gap of the material caused by use of methylamine cations in the prior art, the preparation method comprises the following steps: synthesizing a FAPbI3 compound with a three-dimensional perovskite structure through step-by-step synthesis, introducing aromatic diamine (3-aminomethylpyridine) cations to obtain a (3-aminomethylpyridine) (formamidine) Pb2I7 crystal material; the material shows excellent light absorption performance in ultraviolet and visible light regions; meanwhile, the material shows excellent broadband detection response performance, and the stability of the material in the environment reaches up to three months. As a novel semiconductor material, the perovskite material has potential application value in the fields of broadband photoelectric detection and the like.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a DJ-type methylamine-free narrow bandgap two-dimensional double-layer hybrid perovskite material and a preparation method. Background technique [0002] In recent years, organic-inorganic hybrid perovskite semiconductor materials have attracted much attention due to their narrow optical bandgap, high light absorption coefficient, excellent carrier mobility and long exciton diffusion length, making them It is an ideal material for the preparation of optoelectronic devices. Compared with three-dimensional perovskite materials, the two-dimensional organic-inorganic hybrid perovskite materials obtained by introducing large-sized organic cations have excellent environmental stability and species diversity. Among them, the Dion-Jacobson (DJ) type two-dimensional hybrid perovskite material has no van der Waals gap between adjacent inorganic frameworks, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/46H01L51/48H01L51/42
CPCH10K71/12H10K85/30H10K30/00Y02E10/549
Inventor 符冬营辛建丽何跃跃侯坐铭
Owner SHANXI UNIV
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