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New application of polyvinylamine, perovskite thin film, perovskite solar cell and fabrication method of perovskite solar cell

A solar cell and polyvinylamine technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as difficulty in obtaining continuous dense and consistent films, charge and energy loss, and battery efficiency decline, and achieve long-term stability , Inhibit interface recombination and reduce charge loss

Active Publication Date: 2016-12-07
ZHENGZHOU UNIV
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  • Description
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Problems solved by technology

[0003] However, there are still two key factors restricting the development of perovskite solar cells: 1) The one-step solution method, which has the lowest cost and is the most widely used in the preparation of perovskite thin films, has poor film-forming properties, and it is difficult to obtain continuous, dense and uniform films. Good film, while the existence of charge recombination centers such as pinholes leads to unnecessary charge and energy loss, can not carry out effective charge transport, low photovoltaic performance and poor repeatability; 2) lead halide perovskite materials are easy to Dissolution and degradation, resulting in rapid decline in battery efficiency and poor battery stability

Method used

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  • New application of polyvinylamine, perovskite thin film, perovskite solar cell and fabrication method of perovskite solar cell
  • New application of polyvinylamine, perovskite thin film, perovskite solar cell and fabrication method of perovskite solar cell
  • New application of polyvinylamine, perovskite thin film, perovskite solar cell and fabrication method of perovskite solar cell

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Embodiment 1

[0031] The preparation method of embodiment 1 PVAm HI

[0032] This embodiment provides a preparation method of PVAm HI, and its specific synthetic route is as follows:

[0033] .

[0034](1) Synthesis of PNVF: Add NVF aqueous solution and initiator AIBN into a three-necked flask, where ω(NVF)=20%, m(AIBA) / m(NVF)=0.5%. Nitrogen was passed to remove the oxygen in the system, and the mixture was stirred under reflux at 65° C. for 6 h. After the reaction was completed, the reaction solution was slowly added to four times the volume of acetone, stirred to precipitate a white precipitate, and filtered with suction to obtain a white precipitate. Dissolve the white precipitate in a small amount of deionized water, then slowly pour it into four times the volume of acetone for precipitation, and repeat the operation three times to ensure that there is no unreacted monomer NVF and initiator AIBN remaining in the precipitate. Vacuum dry at 40°C for 24h to constant weight, and calcul...

Embodiment 2

[0040] A kind of perovskite film, its general structural formula is: ABX 3 , the A is -[CH 2 CH(NH 3 + )] n - and CH 3 NH 3 + A mixture of the two, the B is Pb 2+ ; Said X is I - . In other embodiments, B can also be Sn 2+ or Cu 2+ etc.; X can also be Cl - or Br - Wait.

[0041] Its preparation method comprises the following steps:

[0042] a) Acidification reaction of polyvinylamine PVAm with hydroiodic acid HI to obtain polyvinylaminoiodate PVAm·HI;

[0043] b) PVAm HI, methylamine iodide MAI and lead iodide PbI 2 Add it into an organic solvent and stir at 60°C for 12h to obtain a perovskite precursor solution; in step b), the amino groups in the MAI and PVAm·HI and PbI 2 The molar ratio of C(PbI 2 )=1.25M, and the molar ratio of MAI and PVAm HI is 24:1, the organic solvent is a mixture of dimethyl sulfoxide and γ-butyrolactone; dimethyl sulfoxide and γ-butyrolactone by volume 3:7 for mixing.

[0044] c) Spin-coating: Spin-coat at 1000r.p.m for 20s, then s...

Embodiment 3

[0046] A kind of perovskite thin film, with embodiment 2.

[0047] Its preparation method comprises the following steps:

[0048] a) Acidification reaction of polyvinylamine PVAm with hydroiodic acid HI to obtain polyvinylaminoiodate PVAm·HI;

[0049] b) PVAm HI, methylamine iodide MAI and lead iodide PbI 2 Add it into an organic solvent and stir at 50°C for 14h to obtain a perovskite precursor solution; in step b), the amino groups in the MAI and PVAm·HI and PbI 2 The molar ratio of C(PbI 2 )=1.25M, and the molar ratio of MAI and PVAm HI is 24:1, the organic solvent is a mixture of dimethyl sulfoxide and γ-butyrolactone; dimethyl sulfoxide and γ-butyrolactone by volume 2:7 for mixing.

[0050] c) Spin-coating: first spin-coat at 1200r.p.m for 15s, then spin-coat at 3500r.p.m for 25s; after spin-coating, add toluene and continue spin-coating to remove the solvent to obtain a perovskite film. Lower annealing for 12 minutes.

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Abstract

The invention discloses new application of polyvinylamine, and also discloses a perovskite thin film and a preparation method of the perovskite thin film. The structural general formula of the perovskite thin film is ABX3, wherein A is polyvinylamined cation-[CH2CH(NH<3+>)]<n>- and methylamino cation CH3NH<3+>, B is metal cation, and X is halogen anion. The preparation method comprises the following steps of a) performing acidizing reaction of the polyvinylamine PVAm and haloid acid HX to obtain polyvinylamine halite PVAm.HX; b) adding the PVAm.HX, methyl halide amine MAX and a metal halide to an organic solvent for mixing to obtain a perovskite precursor solution; and c) performing annealing processing after spin-coating. The invention simultaneously and further discloses a method for preparing a perovskite solar cell by using the perovskite thin film and the perovskite solar cell. By a perovskite thin film absorption layer, the light absorption capability is favorably improved, the charge transmission capability is improved, and the perovskite thin film absorption layer is in favorable contact with ETM and HTM; the stability of the perovskite thin film on environmental humidity is improved, and an important significance is developed for long-term actual application of the device; and the preparation method is simple, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of solar cell preparation, and specifically relates to a new application of polyvinylamine, a related perovskite thin film, and a preparation method of a perovskite solar cell. Background technique [0002] Photoelectric utilization of solar energy is the fastest growing and most dynamic research field in recent years, among which the halide lead perovskite material CH 3 NH 3 wxya 3 (X represents a halogen element) Perovskite solar cells (PSCs) as a light-absorbing layer are developing particularly rapidly. Based on the advantages of perovskite materials such as strong absorption, long carrier life, high mobility, bipolar transport characteristics, adjustable band gap, and multiple processing methods, it is possible to manufacture PSCs on a large scale and at low cost. At present, the certification efficiency of PSC has reached 20.1%. [0003] However, there are still two key factors restricting the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K85/00H10K30/451Y02E10/549
Inventor 曹少魁刘应良李晗徐慎刚
Owner ZHENGZHOU UNIV
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