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Preparation method of large-grained iodide perovskite thin film

An iodide and perovskite technology is applied in the field of preparation of large-grain iodide perovskite thin films, which can solve the problems of small grain size and poor grain uniformity of perovskite thin films, and achieve large grain size. , The film thickness is easy to control, and the grain size uniformity is good.

Inactive Publication Date: 2017-08-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the disadvantages of poor grain uniformity and too small grain size in the perovskite thin film prepared by the existing method, the invention provides a method for preparing a large grain iodide perovskite thin film. Ultrasonic the raw materials to disperse the raw materials into very small particles and then fully react, and finally grind to obtain micron-sized large grains and high-quality perovskite films

Method used

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  • Preparation method of large-grained iodide perovskite thin film
  • Preparation method of large-grained iodide perovskite thin film
  • Preparation method of large-grained iodide perovskite thin film

Examples

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Embodiment 1

[0023] (1) Change CH 3 NH 3 I and PbI 2 After mixing in equal molar amounts, methanol was added, and the reaction was sonicated for 30 minutes to obtain yellow methylamine lead iodide precipitate. Remove the supernatant, heat the yellow precipitate at 100-120°C to remove excess methanol, and grind the dried powder under nitrogen protection to obtain methylamine lead iodide perovskite particles. Disperse the perovskite particles in the pine In oleyl alcohol, a precursor solution with a concentration of 1 mol / L is obtained.

[0024] (2) Spin-coating the dense layer and the porous layer on the cleaned FTO glass sheet surface respectively. The spin-coating conditions are low speed 1000rpm for 10s, then high speed 5000rpm for 40s, then annealing treatment, the treatment temperature is 100℃, and the time is 1h .

[0025] (3) The precursor solution was spin-coated on the FTO glass base layer under the conditions of low-speed 1000rpm for 10s, high-speed 6000rmp for 35s, and then annealed ...

Embodiment 2

[0027] (1) Change CH 3 NH 3 I and PbI 2 After mixing in equal molar amounts, methanol was added, and the reaction was sonicated for 30 minutes to obtain yellow methylamine lead iodide precipitate. Remove the supernatant, heat the yellow precipitate at 100-120°C to remove excess methanol, and grind the dried powder under nitrogen protection to obtain methylamine lead iodide perovskite particles. Disperse the perovskite particles in the pine In oleyl alcohol, a precursor solution with a concentration of 1 mol / L is obtained.

[0028] (2) Spin-coating the dense layer and the porous layer on the cleaned FTO glass sheet surface respectively. The spin-coating conditions are low speed 1000rpm for 10s, then high speed 5000rpm for 40s, then annealing treatment at 100°C for 1h.

[0029] (3) Spin-coating the precursor solution onto the FTO glass base layer under the conditions of low-speed 1000rpm for 10s, high-speed 6000rmp for 35s, and then annealed at 120℃ to remove excess solvent to obtain...

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Abstract

The invention discloses a preparation method of a large-grained iodide perovskite thin film. The preparation method comprises the steps of: adding methylammonium iodide and iodide powder into methanol for ultrasonic treatment, so that the raw materials are dispersed into tiny particles for sufficient reaction, and finally a micron-scale large-grained quality perovskite thin film is obtained through grinding. The perovskite thin film prepared by adopting the preparation method has the advantages that the grain size evenness is good, the thin-film cover degree is high, the thin film thickness is easy to control, the grain size is large, the thin film can reach micron-scale, the large grains can effectively reduce density of a grain boundary, and the transport rate of carriers is increased. The efficiency of a battery prepared by adopting the thin film is increased from 7.79% to 10.13%, namely, is increased by 2% than that of the conventional method.

Description

Technical field [0001] The invention belongs to the field of photoelectric device preparation, and relates to a preparation method of a large-crystalline iodide perovskite film. Background technique [0002] ABI 3 Type iodide materials have excellent optical properties such as long carrier life, low electron-hole recombination probability, low exciton binding energy, wide absorption spectrum and large light absorption coefficient, and are widely used in solar cells. Perovskite-type solar cells use perovskite materials as the light absorption layer of the battery. The efficiency of perovskite solar cells ranges from 3.8% in 2009 to 22% in 2016. In just a few years, the photoelectric conversion of the cell The efficiency has been developed rapidly, and the efficiency has been close to that of monocrystalline solar cells, so it has received extensive attention. [0003] Among the perovskite-type light-absorbing materials, the most studied is methylamine lead iodine (CH 3 NH 3 PbI 3 )...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/12H10K30/10Y02E10/549
Inventor 白帆张树芳苗晓亮邱婷胡延强严仲
Owner NANJING UNIV OF SCI & TECH
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