Method for rapidly preparing lead selenide PbSe quantum dot ink

Abstract

The invention belongs to the field of preparation of photoelectric materials and quantum dot thin-film solar cells, and discloses a method for rapidly preparing lead selenide PbSe quantum dot ink. Themethod comprises the following steps: dissolving cadmium selenide CdSe quantum dots into n-octane to obtain a CdSe quantum dot solution, and dissolving lead halide PbX2 into N,N-dimethylformamide (DMF) to obtain a PbX2 solution; injecting the CdSe quantum dot solution into the PbX2 solution, conducting oscillating, and performing standing until the solution system is layered into an upper layer and a lower layer, wherein at the moment, the upper layer is an n-octane solution, and the lower layer is a PbSe quantum dot solution; and removing the upper layer to obtain the lead selenide PbSe quantum dot ink. According to the invention, the lead halide-coated stable PbSe quantum dots can be obtained by utilizing a one-step exchange method, and the preparation method is high in process repeatability, simple to operate, high in yield and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of photoelectric materials and quantum dot thin film solar cell preparation, more specifically, relates to a method for rapidly preparing lead selenide PbSe quantum dot ink, based on the method can obtain a stable PbSe quantum dot film, which can be applied to various Devices based on PbSe thin films, such as: solar cells, infrared detectors and infrared imaging devices. Background technique [0002] In the past ten years, quantum dots have been successfully applied to infrared detection devices, displays and solar cell devices due to their easy synthesis, adjustable band gap, excellent photoelectric properties, and low cost, which have attracted the attention of academia and enterprises. focus on. [0003] The traditional method for synthesizing PbSe quantum dots is the cation exchange method. First, CdSe is synthesized by the hot injection method, and then PbSe is obtained from CdSe by the cation exchange method. W...

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Problems solved by technology

[0006] Aiming at the disadvantages of complex process in the preparation of PbSe quantum dots in the prior art, the purpose of the present invention is to provide a method for rapidly preparing lead selenide PbSe quantum dot ink, using a one-step exchange method, through the composition of the precursor and the PbX 2 Ratio concentration control, using CdSe and PbX 2 The feed ratio control components, and finally the stable PbSe quantum dots coated with lead halide are obtained. The lead halide can fully coat the PbSe quantum dots, and at the same time it will not affect the performance of the quantum dots due to excess. The preparation of the present invention The method has high process repeatability, simple operation and high yield, and is suitable for large-scale industrial production

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