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Surface protection layer for improving stability of perovskite nanosheet laser and preparation method thereof

A technology of nanosheets and protective layers, which is applied in the field of perovskite nanosheet lasers, can solve the problems of losing the thermal stability of perovskite nanosheet lasers, and achieve the effects of improving air stability, stability, and good hydrophobicity

Inactive Publication Date: 2020-10-30
TAIYUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

In the experiment, a layer of high-viscosity polymethyl methacrylate (PMMA) was spin-coated on the top of the perovskite film for external packaging of the device. However, due to the high laser pulse energy density of the perovskite solid film in the perovskite laser, Both the electron and lattice temperature of the active medium increase, and PMMA will undergo glass transition and soften and deteriorate when the temperature is above 80°C, thus losing the effect of protecting the thermal stability of the perovskite nanosheet laser

Method used

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  • Surface protection layer for improving stability of perovskite nanosheet laser and preparation method thereof
  • Surface protection layer for improving stability of perovskite nanosheet laser and preparation method thereof

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Embodiment 1

[0022] 1. Preparation of perovskite nanosheets Atomically smooth PbI was fabricated on a mica sheet substrate by physical vapor deposition 2 Template, the lead iodide template is placed above the quartz tube in the tube furnace, methylammonium iodide (MAI) is placed near the template below the quartz tube, and the lead iodide and MAI are reacted to form regular and Unwrinkled facets, atomically smooth perovskite nanosheets with an average surface roughness of less than 2 nm (Adv. Funct. Mater. 2018, 1805553). It has a low density of surface defect states, which is conducive to the formation of low-threshold, high-quality factor lasers, and has good optical stability under continuous pump output conditions. Similarly, with PbBr 2 , PbCl 2 The perovskite nanosheets prepared as templates can be applied to perovskite nanosheet lasers as optical resonators and gain media at the same time.

[0023] 2. Preparation of protective layer

[0024] Spin-coat the protective layer on it...

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Abstract

The invention relates to the field of perovskite nanosheet lasers. The invention discloses a surface tetraphenyl dibenzodiindenopyrene (DBP) protective layer for improving the stability of a perovskite nanosheet laser and a preparation method thereof. The good hydrophobic property of the DBP material can effectively prevent water vapor from damaging a perovskite layer, so that the air stability ofthe device is improved. Meanwhile, the electron temperature and the lattice temperature of the active medium of the perovskite layer in the perovskite laser are increased under the condition of highlaser pulse energy density, and the high temperature resistance of the DBP film is beneficial to reducing the thermal decomposition of the perovskite layer, so that the thermal stability of the perovskite laser is improved. The invention relates to the surface protection layer for improving the stability of the perovskite nanosheet laser and the preparation method thereof.

Description

technical field [0001] The invention relates to the field of perovskite nanosheet lasers. Background technique [0002] As a new type of high-efficiency semiconductor material, perovskite has been widely used in many optoelectronic devices. However, because perovskite materials will be decomposed under the influence of water, light, oxygen, and temperature in the external environment, their development in optoelectronic devices has been hindered. [0003] In 2017, Songtao Chen, School of Engineering, Brown University, and Cheng Zhang, Department of Electrical Engineering, Yale University, etc. 3 NH 3 PB 3 Perovskite thin film, placed between two distributed Bragg reflectors (DBR) to realize a new hybrid perovskite vertical cavity surface emitting laser (Adv. Mater. 2017, 1604781). In the experiment, a layer of high-viscosity polymethyl methacrylate (PMMA) was spin-coated on the top of the perovskite film for external packaging of the device. However, due to the high la...

Claims

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Application Information

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IPC IPC(8): H01S5/028H01S5/30B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01S5/0282H01S5/0283H01S5/30
Inventor 李国辉皮慧慧崔艳霞郝玉英
Owner TAIYUAN UNIV OF TECH
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