The heterojunctions are dissociated based on multiple excitons of perovskite nanocrystals and acene molecular materials

A technology of acene molecules and nanocrystals, which is applied in the field of multi-exciton dissociation heterojunctions and can solve problems such as difficulty in multi-exciton dissociation

Inactive Publication Date: 2020-03-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-exciton dissociation heterojunction based on perovskite nanocrystal-acene organic molecule hybrid material, so as to solve the technical problem of difficult multi-exciton dissociation in the optoelectronic device

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  • The heterojunctions are dissociated based on multiple excitons of perovskite nanocrystals and acene molecular materials
  • The heterojunctions are dissociated based on multiple excitons of perovskite nanocrystals and acene molecular materials
  • The heterojunctions are dissociated based on multiple excitons of perovskite nanocrystals and acene molecular materials

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Embodiment

[0019] A multi-exciton dissociation heterojunction based on a perovskite nanocrystal-acene organic molecular hybrid material described in this embodiment, the preparation method includes the following steps:

[0020] Mix 0.1μmol NC (10nm in size) hexane solution (2mL) with 2mg TCA molecules and place in an ultrasonic machine for 10 minutes of ultrasonication, followed by filtration with a 0.25μm pore size polytetrafluoroethylene membrane to obtain NC-TCA solution , its UV-Vis steady-state absorption spectrum as figure 1 As shown in a (the spectrum is obtained by Agilent carry 5000 instrument, the concentration is 0.05mmol / L), since TCA molecules are insoluble in hexane solution, it can be confirmed that TCA molecules are bonded to NC through coordination. Meanwhile, 0.1 μmol NC (10 nm in size) was dissolved in 2 mL hexane solution as a reference sample.

[0021] Whether the NC-TCA heterojunction prepared by us can achieve multi-exciton dissociation needs to be verified...

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Abstract

The invention relates to a multi-exciton dissociation heterojunction based on a perovskite nanocrystalline-acene organic molecule hybrid material. According to the heterojunction, perovskite nanocrystalline is used as a light absorption layer material, and acene molecules are used as a multi-exciton dissociation layer material. High extinction coefficient of perovskite nanocrystals is utilized toabsorb light efficiently, and benzene molecules quickly extract holes in perovskite to realize exciton dissociation. The size of the perovskite nanocrystals is 1-50 nanometers, and the perovskite nanocrystals can be all-inorganic perovskite or organic-inorganic hybrid perovskite. Through a time-resolved spectrum detection technology, it is observed that the hole transfer time from CsPbBr2. 625Cl <0.375 > to TCA molecules is 7.6 picoseconds, and the service life of a charge separation state is as long as 5.1 microseconds. The super-long charge separation state enables the heterojunction to dissociate six photo-induced excitons.

Description

technical field [0001] The invention relates to a multi-exciton dissociation heterojunction based on a perovskite nanocrystal-acene organic molecule hybrid material. Background technique [0002] In optoelectronic applications, trihalogen perovskite nanocrystals are a class of promising optoelectronic materials. This type of material has excellent light absorption and emission properties, so it can be used to prepare high-performance photovoltaic devices such as solar cells, photodetectors, and light-emitting diodes. Functionalizing perovskite nanocrystals with organic molecules is a proven strategy for realizing novel optoelectronic properties. This strategy mainly utilizes fundamental kinetic processes such as charge or energy transfer between perovskite nanocrystals and molecules. For example, charge transfer from nanocrystals to molecules can be used to drive photochemical reactions in solar energy conversion; on the other hand, energy transfer can transfer light energ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H10K85/00H10K30/10Y02E10/549
Inventor 吴凯丰罗消
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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