CN110003450B - Interface material: zwitterionic conjugated polyelectrolytes with amino acid groups - Google Patents

Abstract

The invention aims to provide a zwitter-ion conjugated polyelectrolyte with amino acid groups, which has water/alcohol solubility and specific interface optimization performance; the material is used as an interface material for modifying an electron transport layer in an n-i-p perovskite solar cell; the perovskite solar cell and the organic solar cell have potential and wide application prospect in the perovskite solar cell, the organic solar cell and the organic light emitting diode.

Description

Interface material: zwitterionic conjugated polyelectrolytes with amino acid groups

Technical Field

The invention relates to an application of zwitter-ion conjugated polyelectrolyte with amino acid group as an interface material in an n-i-p perovskite solar cell.

Background

The perovskite solar cell is developed very rapidly, and is judged as one of ten international technological advances by Science in 2013, so that the perovskite solar cell becomes one of research hotspots of a novel solar cell. The perovskite solar cell is composed of an electrode, an electron transport layer, a hole transport layer and a light active layer, and the performance of the perovskite solar cell depends on the structure of a device, the interface performance between a material and a functional layer; the interface material can modify the functional layer through interface engineering, enhance the transmission and collection of charges, and improve the interface contact among different materials with different properties, thereby realizing the solar cell with high stability and high photoelectric conversion efficiency.

Disclosure of Invention

The invention aims to provide application of zwitter-ion conjugated polyelectrolyte with amino acid group as an interface material in an n-i-p perovskite solar cell.

The invention is characterized in that the structural general formula of the zwitterionic conjugated polyelectrolyte with amino acid groups is shown as the following formula,

wherein y =1-8

The invention also features the use of a zwitterionic conjugated polyelectrolyte with amino acid groups in n-i-p perovskite solar cells.

Drawings

The above features and advantages of the present invention will be more clearly understood by reference to the following drawings and detailed description, in which:

AFM topography for the POWT film of material of FIG. 1;

FIG. 2 perovskite solar cell Current Density/Voltage ((R))J _sc /V _oc ) Graph is shown.

Detailed description of the preferred embodiments

The implementation case is as follows:

in the following, preferred embodiments of the present invention are described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, taking polymer POWT (y = 1) as an example.

Performance characterization of the POWT material:

POWT can be dissolved in polar solvent, and the solution can be formed into film by spin coating; the film has good and uniform quality, the surface roughness is 2.33 nm (figure I), and the preparation of the perovskite film with good uniformity is facilitated.

Preparation and characterization of perovskite solar cells:

(1) the ITO substrate of 1.5 cm x 1.5 cm is subjected to ultrasonic treatment twice in deionized water, then is subjected to ultrasonic treatment once in acetone and isopropanol respectively, is dried by a nitrogen gun, and is placed in an ultraviolet-ozone instrument for treatment for 15 min.

(2) Cell ITO/SnO₂/POWT/CH₃NH₃PbI₃Preparation of/Spiro-OMeTAD/Au:

firstly, preparing electronic transmission material SnO on ITO substrate by using spin coating method₂Annealing the film for 30min at 150 ℃; then spin coating a methanol/water solution of a zwitterionic conjugated polyelectrolyte to SnO₂Annealing the film at 100 deg.C for 20 min; then the prepared PbI is put into₂Spin coating a mixed solution of MAI and DMSO in DMF to ITO/SnO₂Annealing the surface of the zwitter ion conjugated polyelectrolyte at 130 ℃ for 10 min; spin coating a cavity transport material Spiro-OMeTAD film; and finally, obtaining the Au electrode by using an evaporation method.

(3) And (3) testing the battery performance:

devices were performance tested using Keithley 2400: under simulated AM 1.5G sunlight irradiation conditions (light intensity of 100 mW/cm)²) A photocurrent density/voltage curve was obtained with a scan rate of 50 mV/S.

The ITO/SnO of the battery₂/POWT/CH₃NH₃PbI₃Data were collected after voltage forward and reverse sweeps of/Spiro-OMeTAD/Au.Obtaining open circuit voltage under normal scan condition (V _oc ) 1.01V, and a short-circuit current density ofJ _sc ) Is 25.63 mA cm^-2The Fill Factor (FF) was 62.98% and the photoelectric conversion efficiency was 16.24%.

Claims (2)

1. A zwitter-ion conjugated polyelectrolyte with amino acid groups is used for interface modification of an electron transport layer in a perovskite solar cell, and the structural formula of the zwitter-ion conjugated polyelectrolyte is as follows:

wherein y = 1-8.

2. The use of the zwitterion conjugated polyelectrolyte with amino acid groups according to claim 1 for the interfacial modification of electron transport layers in perovskite solar cells, characterized in that: the method for modifying the conjugated polyelectrolyte interface material comprises the following steps:

preparation of electronic transmission material SnO on ITO substrate by spin coating method₂Annealing the film for 30min at 150 ℃; then spin coating a methanol/water solution of a zwitterionic conjugated polyelectrolyte to SnO₂Annealing the film at 100 deg.C for 20 min; then the prepared PbI is put into₂Spin coating a mixed solution of MAI and DMSO in DMF to ITO/SnO₂Annealing the surface of the zwitter ion conjugated polyelectrolyte at 130 ℃ for 10 min; spin coating a cavity transport material Spiro-OMeTAD film; and finally, obtaining the Au electrode by using an evaporation method.

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