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High-efficiency planar heterojunction perovskite thin film solar cell and preparation method thereof

A solar cell and perovskite technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems that restrict the commercialization process of perovskite solar cell efficiency, and achieve improved light absorption capacity, improved contact conditions, and tight contact Effect

Active Publication Date: 2018-07-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the crystalline quality of the perovskite film and the bonding between different film layers (such as between the light absorbing layer and the hole transport layer) directly affect the key parameter of the perovskite solar cell open circuit voltage as two relatively independent factors. (V oc ), short-circuit current density (J sc ), fill factor (FF) and power conversion efficiency (PCE), which seriously restrict the improvement of the efficiency and commercialization of perovskite solar cells

Method used

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  • High-efficiency planar heterojunction perovskite thin film solar cell and preparation method thereof
  • High-efficiency planar heterojunction perovskite thin film solar cell and preparation method thereof
  • High-efficiency planar heterojunction perovskite thin film solar cell and preparation method thereof

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Embodiment 1

[0028] 1) Treatment of ITO glass: first, clean the ITO glass with a size of 15mm×15mm and an impedance of 10Ω / sq with detergent powder, then ultrasonically treat it in deionized water, absolute ethanol and acetone for 15 minutes, and then UV treatment of ITO glass for 15 minutes;

[0029] 2) Spin coating of the electron transport layer: firstly, the prepared TiO 2 The solution was spin-coated on the ITO glass treated in step 1) at 4000 rpm for 60 seconds, then annealed in air at 150°C for 10 minutes, and slowly cooled to room temperature to obtain dense TiO 2 layer;

[0030] 3) Spin-coating of perovskite light-absorbing layer: Put the above-mentioned ITO glass treated in step 2) into a glove box. Take equimolar ratio of CH 3 NH 3 I and PbI 2 Add it into a mixed solvent of γ-butyrolactone and DMSO with a volume ratio of 7:3 and stir well to obtain a perovskite precursor solution. Then drop the perovskite precursor solution on the TiO 2 On the layer, spin-coat at a rate o...

Embodiment 2

[0035] 1) Treatment of ITO glass: first, clean the ITO glass with a size of 15mm×15mm and an impedance of 10Ω / sq with detergent powder, then ultrasonically treat it in deionized water, absolute ethanol and acetone for 15 minutes, and then UV treatment of ITO glass for 15 minutes;

[0036] 2) Spin coating of the electron transport layer: firstly, the prepared TiO 2 The solution was spin-coated on the ITO glass treated in step 1) at a rate of 4000 rpm for 60 seconds, then annealed in air at 150°C for 10 minutes, and finally cooled slowly to room temperature to obtain dense TiO 2 layer;

[0037] 3) Spin-coating of perovskite light-absorbing layer: Put the above-mentioned ITO glass treated in step 2) into a glove box. Take equimolar ratio of CH 3 NH 3 I and PbI 2 Add it into a mixed solvent of γ-butyrolactone and DMSO with a volume ratio of 7:3 and stir well to obtain a perovskite precursor solution. Then drop the perovskite precursor solution on the TiO 2 On the layer, spi...

Embodiment 3

[0042] 1) Treatment of ITO glass: first, clean the ITO glass with a size of 15mm×15mm and an impedance of 10Ω / sq with detergent powder, then ultrasonically treat it in deionized water, absolute ethanol and acetone for 15 minutes, and then UV treatment of ITO glass for 15 minutes;

[0043] 2) Spin coating of the electron transport layer: firstly, the prepared TiO 2 The solution was spin-coated on the ITO glass treated in step 1) at a rate of 4000 rpm for 60 seconds, then annealed in air at 150°C for 10 minutes, and slowly cooled to room temperature to obtain dense TiO 2 layer;

[0044] 3) Spin-coating of perovskite light-absorbing layer: Put the above-mentioned ITO glass treated in step 2) into a glove box. Take equimolar ratio of CH 3 NH 3 I and PbI 2 Add it into a mixed solvent of γ-butyrolactone and DMSO with a volume ratio of 7:3 and stir well to obtain a perovskite precursor solution. Then drop the perovskite precursor solution on the TiO 2 On the layer, spin-coat a...

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Abstract

The present invention relates to a high-efficiency planar heterojunction perovskite thin film solar cell and a preparation method thereof. A DMSO solution (a solvent of dissolved perovskite precursorsubstances) is added into a solution of a hole transport layer, and a spin-coating method is employed to prepare the hole transport layer. Oxygen atoms in the DMSO comprise lone pair electrons, nakedbindungslos CH3NH3+ at a perovskite crystal boundary can be effectively combined through electrostatic interaction to improve the crystal quality of perovskite crystal so as to improve the light absorbing ability of the perovskite thin film; and the DMSO can dissolve the perovskite thin film, part of the hole transport materials can be permeated at the surface of a perovskite layer to form a mixing layer of interinfiltration of the perovskite and the hole transport materials to allow a light absorbing layer and the hole transport layer to be more compacted so as to avoid the generation of badcontact phenomena such as holes and needle eye formed between layers. The improvement of perovskite film formation quality and contact conditions between layers is improved while the DMSO is added into an HTM, and therefore the photoelectric property of the PSCs is effectively improved.

Description

technical field [0001] The invention belongs to the field of solar cell devices, and relates to a high-efficiency planar heterojunction perovskite thin-film solar cell and a preparation method thereof, in particular to a perovskite solar cell (Perovskite Solar Cells, PSCs) obtained by a one-step method at room temperature and its Preparation. Background technique [0002] Energy shortage and environmental pollution have become important factors restricting the development of today's society and economy. Solar cells developed on the basis of a clean renewable energy source - solar energy are considered to be an important development direction to solve energy shortages and environmental pollution. However, solar cells at this stage still face problems such as low conversion efficiency and high production costs, which are difficult to apply to actual production. Perovskite solar cells have attracted the attention of many researchers due to their excellent photoelectric perform...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/15H10K71/12H10K85/30H10K30/00Y02E10/549
Inventor 李炫华王双洁仝腾腾
Owner NORTHWESTERN POLYTECHNICAL UNIV
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