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Narrow bandgap electron acceptor materials and organic solar cells composed of them

An electron acceptor material and technology for solar cells, applied in the field of organic solar cells, can solve the problems of non-adjustable energy level, limiting the development of fullerene-based organic solar cells, weak absorption in the visible light range, etc., achieving high electron mobility and light absorption. wide range of effects

Active Publication Date: 2020-04-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the early stage of the development of organic solar cells, fullerenes were mainly used as acceptors, but fullerenes and their derivatives have weak absorption in the visible light range and non-adjustable energy levels, which limit the development of fullerene-based organic solar cells.

Method used

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  • Narrow bandgap electron acceptor materials and organic solar cells composed of them
  • Narrow bandgap electron acceptor materials and organic solar cells composed of them
  • Narrow bandgap electron acceptor materials and organic solar cells composed of them

Examples

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Embodiment 1

[0047] Embodiment 1: Preparation of T1-T4 electron acceptor material

[0048] Formylation of 2Br-FTT by Vilsmeier reaction afforded products 1a and 1b, with 1a being the main product. The two products were chromatographically separated and materials T1-T3 were prepared as product 1a and material T4 was prepared as product 1b.

[0049] The preparation process of T1-T3 is: mix product 1a with IDT-Tin, use toluene as solvent, add Pd(PPh 3 ) 4 A Stille coupling reaction (110 °C, 16 h) was carried out to give the product 2a. Then the product 2a was mixed with the terminal group IC, β-alanine was added with 1,2-dichloroethane / ethanol as solvent, and after bubbling with argon, the reaction was heated under reflux and stirred (70°C, 16h). After the reaction, methanol precipitation was used, and after suction filtration, a silica gel chromatography column was used with dichloromethane / n-hexane as the eluent to purify to obtain the narrow-bandgap electron acceptor material. In this ...

Embodiment 2

[0055] Embodiment 2: Preparation of organic solar cells

[0056] Clean the ITO glass substrate with detergent, rinse it with clean water, and sonicate the glass with deionized water for 15 minutes, then use acetone and isopropanol to sonicate the glass for 15 minutes, take it out and dry the ITO glass substrate with a nitrogen gun, Then perform UVO cleaning. Adsorb the UVO-cleaned ITO glass substrate on the homogenizer, set the speed at 3500rpm, and evenly coat the ZnO solution on the ITO glass substrate for 60s, then put the ITO glass substrate in an oven at 170°C for drying After 15 minutes, it was transferred to a nitrogen-filled glove box for subsequent use. The donor material PTB7-Th was mixed with one of T1-T4 at a mass ratio of 1:1.8, dissolved in chloroform solvent at a total concentration of 20 mg / mL, and stirred for 2 hours. The stirred mixed solution was spin-coated on the ZnO layer at a rotation speed of 2000 rpm for 60 s to form a photosensitive layer. Put the ...

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Abstract

The invention discloses four kinds of electron acceptor materials with narrow band gap and the organic solar cells formed thereof. The present invention synthesizes the above-mentioned four near-infrared light-absorbing compounds and prepares corresponding organic solar cells through molecular design based on differences in the skeleton isomerism of conjugated molecules and the number of substitutions of fluorine atoms. The prepared organic solar cells all have high short-circuit current J SC And higher fill factor FF, where the energy conversion efficiency of organic solar cells where this new type of electron acceptor is located is the highest 10.87%, Jsc is 24.85mA / cm 2 .

Description

technical field [0001] The invention relates to a new near-infrared light-absorbing material and a solar cell, in particular to four novel narrow-bandgap electron acceptor materials and an organic solar cell composed of them. Background technique [0002] The efficient conversion of sunlight into electrical energy through solar cells has always been a focus of attention and research in academia and industry. Inorganic solar cells dominated by silicon-based solar cells are currently the most mature varieties of solar cells, with relatively high photoelectric conversion efficiency, but high energy consumption and pollution in the manufacturing process have brought high production costs, and at the same time Pollution to the surrounding environment. [0003] Organic solar cells are solar cells made of two different types of organic semiconductor materials. They have the advantages of solution processing, low cost, and light weight, and have attracted widespread attention. Com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D519/00H01L51/46
CPCC07D519/00H10K85/615H10K85/6576H10K30/00Y02E10/549
Inventor 李昌治许景琦刘志玺陈明陈红征
Owner ZHEJIANG UNIV