Inorganic perovskite material, photoelectric detector and preparation method of inorganic perovskite material

A photodetector, inorganic calcium technology, applied in chemical instruments and methods, polycrystalline material growth, metal material coating technology, etc. Effect

Active Publication Date: 2021-06-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the CsPbBr with regular shape and less surface defects in the prior art. 3 The single-crystal bulk process is cumbersome and requires additional chemical reagents, providing an inorganic perovskite material and its preparation method, and a photodetector made of the inorganic perovskite material

Method used

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  • Inorganic perovskite material, photoelectric detector and preparation method of inorganic perovskite material
  • Inorganic perovskite material, photoelectric detector and preparation method of inorganic perovskite material
  • Inorganic perovskite material, photoelectric detector and preparation method of inorganic perovskite material

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Embodiment 1

[0026] (1) Preparation of CsPbBr by anti-solvent diffusion method 3 Single crystal: weigh 3.3g of PbBr 2 and 1.4 g of CsBr were dissolved in 15 ml of DMSO and stirred for more than one hour. Then filter the precursor solution with an organic syringe filter, filter to obtain a clear solution, and filter the clear solution with CH 3 Titrate with OH until an orange-yellow precipitate precipitates, and filter again to obtain a clear solution, which is moved to a place filled with CH 3 In the environment of OH vapor, the ambient temperature was kept at 20 °C, and CsPbBr was obtained after a week of growth. 3 single crystal.

[0027] (2) CsPbBr 3 Preparation of powder: weigh 1.3g of CsPbBr 3 The single crystal is ground into powder in an agate mortar.

[0028] (3) Hot isostatic pressing of CsPbBr 3 Preparation of polycrystalline bulk: CsPbBr 3 The powder was placed in a hot isostatic press, the pressure was set at 20MPa, the temperature was 200°C, and the heating time was 8h...

Embodiment 2

[0031] (1) CsPbBr 3 Laser surface modification of polycrystalline bulk materials: use a 248nm KrF excimer laser, and set the energy density of the laser to 10mJ / cm2 , the laser operating frequency is set to 10Hz, the CsPbBr prepared by step (3) in Example 1 3 The polycrystalline block was irradiated, and the number of irradiation pulses was 30 to obtain laser-modified CsPbBr 3 polycrystalline blocks;

[0032] (2) CsPbBr 3 Fabrication of photodetectors: CsPbBr after laser surface modification 3 Evaporation of Au interdigitated electrodes on polycrystalline bulk to obtain CsPbBr 3 Photodetector.

[0033] CsPbBr before and after laser modification in embodiment 1 and 2 3 The cross-sectional scanning SEM image of the polycrystalline bulk material, the results are as follows figure 1 a and figure 1 b shown by figure 1 It can be seen that, compared with before laser modification, CsPbBr after laser modification 3 There are no small particles of CsPbBr on the surface of the ...

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Abstract

The invention relates to the field of inorganic perovskite materials, in particular to an inorganic perovskite material, a photoelectric detector and a preparation method of the photoelectric detector. The preparation method comprises the following steps: preparing a full-inorganic perovskite polycrystalline block material from inorganic perovskite powder by adopting a hot isostatic pressing method, and carrying out surface modification on the inorganic perovskite polycrystalline block material by using an excimer laser. The hot isostatic pressing preparation method is simple, the material utilization rate is higher, the method is more universal, devices in any shape can be prepared according to requirements, and later processing is more convenient. The laser modification can simply and quickly reduce the surface defects of the inorganic perovskite polycrystalline block material, consumes short time, and does not need to introduce new chemical reagents. Then an Au interdigital electrode is evaporated on the surface of the inorganic perovskite material to obtain the photoelectric detector. The method is suitable for research and commercial production of photoelectric detectors based on inorganic perovskite materials, and has a good application prospect.

Description

technical field [0001] The invention discloses a field based on inorganic perovskite materials, in particular to inorganic perovskite materials, photoelectric detectors and preparation methods thereof. Background technique [0002] Perovskite materials have many excellent properties, such as high light absorption coefficient, high carrier mobility, long carrier diffusion length, etc. These properties can well meet the requirements of high-efficiency optoelectronic devices, making perovskite materials have broad application prospects in photoelectric detection, ray detection, solar cells and other fields. For example, after ten years of development, the photoelectric conversion efficiency of polycrystalline perovskite thin film solar cells has increased from 3.8% in 2009 to 25.5% in 2021, surpassing the efficiency record of polycrystalline silicon solar cells (23.3%) and approaching that of single crystal solar cells. Record efficiency (26.1%) for silicon solar cells [Prog P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C23C14/18C23C14/24C30B7/14C30B28/02C30B33/00H01L31/032H01L31/09
CPCC30B29/12C30B7/14C30B28/02C30B33/00C23C14/24C23C14/18H01L31/032H01L31/09
Inventor 王时茂赵啸孟钢方晓东陶汝华邓赞红
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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