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A kind of inorganic perovskite solar cell and preparation method thereof

A solar cell and perovskite technology, applied in the manufacture of circuits, electrical components, final products, etc., can solve problems such as large band gap, easy decomposition, instability, etc., to increase open circuit voltage, suppress charge recombination, and optimize crystallization Effect

Active Publication Date: 2019-05-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most common perovskite material is lead iodide methylamine (CH 3 NH 3 PB 3 ), has a suitable bandgap width and good carrier transport performance, and the perovskite solar cell using it as a light-absorbing material has achieved high efficiency. However, due to the presence of the A-site methylamino organic group, this This material is not very stable and tends to decompose when exposed to excessive heat or humidity
All-inorganic perovskite material CsPbX 3 Compared with organic-inorganic hybrid CH 3 NH 3 PB 3 Has better thermal stability, where CsPbI 3 The cubic perovskite phase has a good band gap of 1.73eV, but its cubic phase is very unstable at room temperature; CsPbBr 3 It has good phase stability, but its bandgap is too large (2.3eV), which is not conducive to the preparation of high-efficiency perovskite solar cells; CsPbI 2 The band gap of Br is 1.92eV, and the cubic phase is relatively stable at room temperature, so it has been widely studied in all-inorganic perovskite solar cells
However, with CsPbI 2 The efficiency of solar cells with Br as the light-absorbing layer is still low, close to 10%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of perovskite precursor solution: first, PbI2 , PbBr 2 and CsI were dissolved in DMF and DMSO at a molar ratio of 1:1:2. As preferably, the present embodiment weighs 0.208 gram of CsI, 0.1844 gram of PbI respectively 2 with 0.1469 g PbBr 2 Dissolve together in a mixed solution of 1 ml of DMF and DMSO (volume ratio DMF:DMSO=7:3), stir to dissolve.

[0032] Preparation of perovskite solution: Add 27 mg of lead acetate to the perovskite precursor solution, and stir evenly to form a perovskite solution of 5%wt lead acetate.

[0033] Preparation of dense titanium dioxide film: use sol-gel method to coat a layer of dense titanium dioxide film on the conductive glass layer; The titanium dioxide film is treated with titanium tetrachloride and sintered for later use. The thickness of the dense titanium dioxide film is 100-150 nanometers, preferably, the thickness of the dense titanium dioxide film in this embodiment is 100 nanometers. The annealing temperature o...

Embodiment 2

[0041] Preparation of perovskite precursor solution: first, PbI 2 , PbBr 2 and CsI were dissolved in DMF and DMSO at a molar ratio of 1:1:2. As preferably, the present embodiment weighs 0.208 gram of CsI, 0.1844 gram of PbI respectively 2 with 0.1469 g PbBr 2 Dissolve together in a mixed solution of 1 ml of DMF and DMSO (volume ratio DMF:DMSO=7:3), stir to dissolve.

[0042] Preparation of perovskite solution: add 54 mg of lead acetate to the perovskite precursor solution, and stir evenly to form a perovskite solution of 10%wt lead acetate.

[0043] Preparation of dense titanium dioxide film: use sol-gel method to coat a layer of dense titanium dioxide film on the conductive glass layer; The titanium dioxide film is treated with titanium tetrachloride and sintered for later use. The thickness of the dense titanium dioxide film is 100-150 nanometers, preferably, the thickness of the dense titanium dioxide film in this embodiment is 100 nanometers. The annealing temperatur...

Embodiment 3

[0051] Preparation of perovskite precursor solution: first, PbI 2 , PbBr 2 and CsI were dissolved in DMF and DMSO at a molar ratio of 1:1:2. As preferably, the present embodiment weighs 0.208 gram of CsI, 0.1844 gram of PbI respectively 2 with 0.1469 g PbBr 2 Dissolve together in a mixed solution of 1 ml of DMF and DMSO (volume ratio DMF:DMSO=7:3), stir to dissolve.

[0052] Preparation of perovskite solution: Add 81 mg of lead acetate to the perovskite precursor solution, and stir evenly to form a perovskite solution of 15%wt lead acetate.

[0053] Preparation of dense titanium dioxide film: use sol-gel method to coat a layer of dense titanium dioxide film on the conductive glass layer; The titanium dioxide film is treated with titanium tetrachloride and sintered for later use. The thickness of the dense titanium dioxide film is 100-150 nanometers, preferably, the thickness of the dense titanium dioxide film in this embodiment is 100 nanometers. The annealing temperatur...

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Abstract

The invention relates to an inorganic perovskite solar cell and a preparation method thereof. The inorganic perovskite solar cell is characterized by comprising a conductive glass layer, a compact titanium dioxide membrane, a CsPbI2Br crystal membrane, a hole transmission layer and a silver electrode layer which are in a layered shape and are sequentially arranged, wherein lead acetate is doped tothe CsPbI2Br crystal membrane, the CsPbI2Br crystal membrane is prepared from a perovskite solution, the solute of the perovskite solution is CsI, PbI2, PbBr2 and the lead acetate, the solvent of theperovskite solution is DMF and DMSO, and the content of the lead acetate in the perovskite solution accounts for 5-15wt%. The lead acetate is doped to CsPbI2Br, the crystallization of the perovskitemembrane is greatly optimized, the internal charge recombination of the perovskite layer is prevented, so that the open-circuit voltage of the cell is increased, and the efficiency is further improved.

Description

technical field [0001] The invention belongs to the field of optoelectronics, and in particular relates to an inorganic perovskite solar cell and a preparation method thereof. Background technique [0002] Perovskite solar cells are highly valued by scientific research and industry due to their low cost, good performance and simple preparation. Perovskite materials have been used in solar cells since 2009, and the efficiency has exceeded 22% so far, which is 5 times the initial cell efficiency, leaving behind new thin-film solar cells such as dye-sensitized solar cells and organic solar cells. Perovskite solar cells are low-cost thin-film solar cells that have developed very rapidly in the past three years. [0003] The core of the perovskite solar cell structure is the perovskite crystal form (ABX 3 ) of organometallic halide light-absorbing materials. In this perovskite ABX 3 In the structure, A is CH 3 NH 3 + 、CH(NH 2 ) 2 + 、Cs + etc., B is Pb + , Sn + 、 Ge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0264H01L31/18
CPCY02P70/50
Inventor 曾昭兵张京诸跃进陈人杰张英庄学恒
Owner NINGBO UNIV