Fullerene-coated oxide nanoparticle and application thereof in perovskite solar cell

A solar cell and nanoparticle technology, which is applied in the field of nanomaterials and solar cells, can solve the problems of reducing the temperature stability of the device, reducing the device's moisture stability, and the nanoparticle film is not dense enough, so as to prevent moisture from penetrating into the perovskite , Increased electron collection efficiency, improved short-circuit current and fill factor effects

Inactive Publication Date: 2019-04-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After replacing the top electron transport layer with an inorganic oxide such as zinc oxide, the device efficiency drops to 16%
The reason is that there are many hydroxyl groups on the surface of the untreated N-type oxide nanoparticles, which makes the recombination at the perovskite / electron transport layer interface serious. In addition, the inorganic oxide nanoparticles spin-coated on the perovskite substrate are relatively weak Poor film quality also affects efficiency
In addition, the nanoparticle film is not dense enough and has more holes, which allows moisture to penetrate into the perovskite and reduce the stability of the device to moisture.
It has also been reported that surface hydroxyl groups can induce thermal decomposition of perovskite and reduce the stability of the device to temperature.

Method used

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  • Fullerene-coated oxide nanoparticle and application thereof in perovskite solar cell
  • Fullerene-coated oxide nanoparticle and application thereof in perovskite solar cell
  • Fullerene-coated oxide nanoparticle and application thereof in perovskite solar cell

Examples

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Embodiment 1

[0029] Example 1: Synthesis of fullerene-coated zinc oxide nanoparticles and its application in planar trans-perovskite solar cells.

[0030] (1) Synthesis of fullerene-coated titanium dioxide nanoparticles.

[0031] Step 1: Synthesis of titanium dioxide: 1 mL of acetic acid was mixed with 5.208 mL of tetraisopropyl titanate for 30 minutes, after stirring evenly, 25 mL of deionized water was added and stirred for one hour, then 0.82 mL of concentrated hydrochloric acid was added and stirred at 100 °C for 60 Minutes, after cooling down to room temperature, stirring for one hour, the solution was transferred to a reaction kettle, and reacted at 190°C for 24 hours. After the reaction was naturally cooled to room temperature, 0.5 mL of concentrated hydrochloric acid was added and stirred evenly, and then the sample was taken out and washed by centrifugation, first rinsed with deionized water for 3 times, and then rinsed with absolute ethanol until the washing was completed when th...

Embodiment 2

[0049] Example 2: Synthesis of tin dioxide nanoparticles coated with fullerene layer and its application in planar trans perovskite solar cells.

[0050] (1) Synthesis of fullerene-coated tin dioxide nanoparticles.

[0051] Step 1: Synthesis of SnO: 6 mM SnCl 2 2H 2 O was dissolved in 20 ml ethanol, and then 0.4 mM sodium hydroxide aqueous solution was slowly added dropwise to SnCl 2 2H 2 O solution, the pH of the solution was adjusted to 13, and stirred for 1 h. 0.3mM polyvinylpyrrolidone (PVP) was added to the original solution and ultrasonicated for one hour to make it uniformly dispersed. The resulting solution was poured into a reactor and reacted at 180 °C for 12 h. Wait for the reaction kettle to cool down, and after cooling to room temperature, centrifuge the obtained product, wash the product with absolute ethanol three times, and finally place the sample in a vacuum drying oven at 50 degrees Celsius to dry overnight.

[0052] Step 2 is the same as Step 2 in the...

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Abstract

The invention relates to a fullerene-coated oxide nanoparticle and application thereof in a perovskite solar cell. The nanoparticle is of a core-shell structure, wherein a core is N-type oxide nanoparticle with grain size being smaller than or equal to 20 nanometers, and a shell is a fullerene derivative monomolecular layer. A fullerene derivative with carboxyl or pyrocatechol functional group reacts with surface carboxyl of the nanoparticle to achieve covalent bond connection, and the shell layer coating of the nanoparticle is achieved by passivating on the surface of the N-type oxide nanoparticle. The nanoparticle is used as an electronic transmission material applied to the perovskite solar cell, a uniform and compact thin film of the nanoparticle is favorably formed, the formation of aleakage current is suppressed, the charge collection efficiency is improved, and water molecule immersion is prevented; and meanwhile, the surface defect of the nanoparticle is passivated by fullerene coating, the combination probability of a device in an electronic transmission layer interface is further reduced, the nanoparticle is finally applied to the perovskite solar cell, and relatively good photoelectric conversion efficiency and stability are obtained.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and solar cells, and relates to the preparation of a nanomaterial and its application as an electron transport layer in perovskite solar cells. Background technique [0002] In 2009, Japanese scientist Kojima et al. 3 NH 3 PB 3 As a light absorbing layer, the first perovskite solar cell with an efficiency of 3.81% was prepared. In just eight years, the efficiency of perovskite solar cells has reached 23.2%. The rapid improvement of perovskite efficiency is inseparable from its high light absorption coefficient, good carrier transport characteristics, low exciton binding energy, and high tolerance to defects. [0003] In order to improve the hole and electron transport efficiency, perovskite solar cells introduce electron and hole transport layers, which play a very important role in improving the efficiency and stability of the device, and also affect the flexibility of the solar cell dev...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/44H01L51/46
CPCH10K85/211H10K30/10H10K30/80H10K2102/00Y02E10/549
Inventor姚凯刘志亮冷石峰李思博
OwnerNANCHANG UNIV