Electron transport layer material and perovskite solar cell

An electron transport layer and hole transport layer technology, applied in the field of perovskite solar cells, can solve the problems of being unsuitable for industrialized large-scale production, complex synthesis process of fullerene derivatives, difficult purification, etc. The effect of transmission capacity, wide absorption, and high absorption coefficient

Active Publication Date: 2015-07-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the electron transport layer materials of perovskite solar cells reported before, titanium oxide and fullerene derivatives PCBM are mainly used, but most titanium oxide materials require high-temperature processing, and the synthesis process of fullerene derivatives is complicated, and the purification process is difficult. Difficult, not suitable for large-scale industrial production

Method used

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  • Electron transport layer material and perovskite solar cell
  • Electron transport layer material and perovskite solar cell
  • Electron transport layer material and perovskite solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Preparation of poly{2,7-[N,N'-bis(2-ethylhexane)-1,7-dithiophene-perylenetetracarboxylic diimide]-co-2,7-[9,9 '-Di(6-N,N-diethylamino-hexyl)fluorene]} (referred to as NDIT-F6N)

[0036] The synthetic route is as follows:

[0037]

[0038] (1) Monomer 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaboryl)-9,9'-bis(6-N,N- Diethylamino-hexyl)fluorene] was prepared according to the method disclosed in the literature (Adv. Mater., 2011, 23, 1665). Monomer 2,7-dibromo-N,N'-bis(2-ethylhexane)-1,7-dithiophene-perylenetetracarboxylic acid diimide is according to literature (Chem.Mater.,2011, 23,4563) disclosed method preparation.

[0039] (2) The monomer 2,7-dibromo-N,N'-bis(2-ethylhexane)-1,7-dithiophene-perylenetetracarboxylic acid diimide (0.25mmol), 2, 7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborinyl)-9,9'-bis(6-N,N-diethylamino-hexyl) ) fluorene] (0.25mmol) and 9mg three (dibenzylidene acetone) dipalladium and 23mg three (o-methylphenyl) phosphine catalysts are dissolved in the m...

Embodiment 2

[0043] Preparation of photoactive layer materials:

[0044] The CH of the compound I 3 NH 3 The synthesis of I was prepared according to the method disclosed in the literature (J.Am.Chem.Soc.2012, 134, 17396). CH 3 NH 3 PB 3-x Cl x The synthesis of CH 3 NH 3 I, PbI 2 and PbCl 2 Co-dissolved in DMF (N, N-dimethylformamide) or other organic solvents, the specific details are as follows:

[0045] Take CH 3 NH 3 I, PbI 2 and PbCl 2 (The ratio is 4:1:1) was blended and dissolved in 1mL DMF to prepare a solution with a mass fraction of 40%, heated to 60°C, and stirred for 12 hours to obtain a photoactive layer material precursor solution.

[0046] Compound I (CH 3 NH 3 I) and compound II (PbI 2 :PbCl 2 =1:1) mixed at a ratio of 2:1, dissolved in an organic solvent, and then formed a photoactive layer by spin coating.

Embodiment 3

[0048] Preparation of organic-inorganic planar heterojunction solar cells:

[0049] Some ITO conductive glass, the square resistance is about 20 ohms / square, and the specification is 15 mm x 15 mm square. Use acetone, micron-scale semiconductor special detergent, deionized water, and isopropanol to ultrasonically clean for more than half an hour, and place in a constant temperature oven for later use. Before use, ITO glass slides were treated in oxygen plasma for 4 min. PEDOT:PSS (polyethylene dioxythiophene) aqueous dispersion (purchased from Bayer, Clevios P ​​VP AI4083) was used as the hole transport layer, and was spin-coated on ITO at high speed with a homogenizer (KW-4A), and the film thickness About 40 nanometers is better, and the thickness is determined by the concentration of the solution and the rotational speed. It is measured and monitored with a surface profiler (Alpha-Tencor-500 type of Tritek Company). After film formation, heat at 150°C for 20 minutes in the...

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Abstract

Belonging to the technical field of optoelectronic devices, the invention discloses an electron transport layer material and a perovskite solar cell. The perovskite solar cell comprises an anode, a hole transport layer, an optical active layer, an electron transport layer and a cathode. The optical active layer is made of a solution processable organic-inorganic hybrid battery material with a perovskite structure, and the electron transport layer has a structure shown as the specification. According to the invention, a conjugated polymer containing a strong polar group is applied in the electron transport layer material of the perovskite solar cell to replace PCBM, TiO2 or others, and the device making cost can be lowered. Also, the side chain polymer of the contained strong polar group plays a significant cathodic interface modification role, and improves the carrier transport ability, thereby acquiring good device performance.

Description

technical field [0001] The invention belongs to the technical field of photoelectric devices, and relates to an electron transport layer material and a perovskite solar cell prepared by using the material. Background technique [0002] With the rapid growth of population and the continuous development of industrialization, problems such as environmental pollution and energy crisis have become more and more serious, and the research and development of renewable energy represented by solar energy has become a top priority. Solar cells based on inorganic materials such as inorganic silicon, gallium arsenide, and cadmium telluride, which are becoming more mature, have already occupied a dominant position in the market. However, due to the problems of heavy metal pollution and rare elements in the processing process, they are expensive and difficult to Large-scale production and manufacturing of flexible devices, in the pursuit of low cost and green environmental protection in mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12H01L51/42H01L51/46
CPCY02E10/549
Inventor 黄飞孙辰吴志鸿叶轩立曹镛
Owner SOUTH CHINA UNIV OF TECH
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