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Efficient and stable perovskite thin film prepared at room temperature, solar cell and preparation method of efficient and stable perovskite thin film

A technology of perovskite and perovskite precursors, which is applied in the direction of circuits, photovoltaic power generation, electrical components, etc., to achieve the effects of reducing energy consumption, improving stability, and being easy to be

Pending Publication Date: 2020-11-24
THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a high-efficiency and stable perovskite film prepared at room temperature, a solar cell and a preparation method thereof, aiming to solve how to prepare an efficient and stable α-FAPbI at room temperature 3 Problems with Perovskite Films

Method used

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  • Efficient and stable perovskite thin film prepared at room temperature, solar cell and preparation method of efficient and stable perovskite thin film
  • Efficient and stable perovskite thin film prepared at room temperature, solar cell and preparation method of efficient and stable perovskite thin film
  • Efficient and stable perovskite thin film prepared at room temperature, solar cell and preparation method of efficient and stable perovskite thin film

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Embodiment 1

[0064] Weighing PbI 2 (640mg), FAI (NH 2 CH=NH 2 I, 217.4 mg), PbBr 2 (22.7mg), MABr(CH 3 NH 3 Br, 6.9 mg), FASCN (4.7 mg), MASCN (29.9 mg) were dissolved in a mixed solvent of DMF (800 μL) and DMSO (100 μL), wherein, the mixed salt of FASCN and MASCN was recorded as FMSCN, and the moles of FASCN accounted for 12 mol% of the moles of FMSCN. The perovskite precursor solution is prepared by shaking and dissolving, and then filtering. The concentration of FASCN accounts for 30 mol% of the perovskite precursor solution. Fix the substrate on the revolving bracket of the homogenizer, use a pipette gun to draw 50 μL perovskite precursor solution and drop-coat it on the surface of the substrate, set the low-speed spin-coating speed of the homogenizer to 1000rpm, and after spinning for 5s, set the high-speed spinner The coating speed is: 5000rpm, 10s after the high-speed spin-coating step starts, use a pipette gun to quickly drop 150 μL of chlorobenzene to the center of the subst...

Embodiment 2

[0066] According to the experimental parameters and the preparation method of Example 1, the molar number of FASCN accounts for 10mol%, 20mol%, 50mol%, 70mol% of the perovskite film of the black phase of the perovskite precursor solution, and is recorded successively as 1-FMS, 2-FMS, 5-FMS, 7-FMS, wherein the mole number of FASCN accounts for 12 mol% of the mole number of FMSCN.

Embodiment 3

[0079] Fabrication of perovskite solar cells (PSCs). SnO prepared by spin coating on cleaned ITO substrate 2 electron transport layer, in SnO 2The 3-FMS light absorbing layer of Example 1 was prepared by spin coating on the electron transport layer. The Spiro-OMeTAD hole transport layer was prepared by spin coating on the 3-FMS light-absorbing layer, and gold electrodes were deposited on the hole-transporting layer by thermal evaporation to obtain a PSC with a 3-FMS light-absorbing layer, denoted as 3-PSC.

[0080] According to the above PSC preparation method, prepare PSCs with 0-FMS, 1-FMS, 2-FMS, 5-FMS, and 7-FMS light-absorbing layers, which are respectively recorded as 1-PSC, 2-PSC, and 5-PSC , 7-PSC.

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Abstract

The invention provides an efficient and stable perovskite thin film prepared at room temperature, a solar cell and a preparation method of the efficient and stable perovskite thin film. The preparation method comprises the following steps: dissolving formamidine hydriodate, lead iodide, methylamine hydrobromide, lead bromide and thiocyanate in a mixed solvent to obtain a perovskite precursor solution, and spin-coating the perovskite precursor solution on a substrate to prepare the black-phase alpha-FAPbI3 perovskite thin film; dropwise adding an anti-solvent in a high-speed spin-coating process and forming an intermediate phase with thiocyanic acid ions; since thiocyanate ions are unstable, heating annealing treatment is not needed; the intermediate phase can be easily destroyed, an alpha-FAPbI3 perovskite structure is directly formed at room temperature, the preparation energy consumption of the perovskite material is effectively reduced, the alpha-FAPbI3 perovskite material is favorably used for producing and preparing an efficient flexible perovskite solar cell, and the stability of the solar cell is improved.

Description

technical field [0001] The invention relates to the field of manufacturing perovskite solar cells, in particular to a high-efficiency and stable perovskite film prepared at room temperature, a solar cell and a preparation method thereof. Background technique [0002] Organic-inorganic hybrid metal halide perovskite solar cells have experienced rapid development in the last decade due to their low fabrication cost and high photoelectric conversion efficiency. Since it was first reported in 2009, the photoelectric conversion efficiency of perovskite solar cells has rapidly increased from 3.8% to 25.2%, which is close to the highest certified efficiency of commercial silicon-based solar cells. Compared with the traditional CH 3 NH 3 PB 3 (MAPbI 3 ) perovskite, CH(NH 2 ) 2 PB 3 (FAPbI 3 ) Perovskite has more excellent photoelectric properties, such as narrow optical band gap, longer charge diffusion length, better light and thermal stability, and is the most promising p...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/44H01L51/46H01L51/48
CPCH10K71/15H10K71/12H10K85/00H10K30/10H10K30/80Y02E10/549Y02P70/50
Inventor 李刚陈志亮
Owner THE HONG KONG POLYTECHNIC UNIV SHENZHEN RES INST