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Organic solar cell with cyclopentyl bithiophene derivative as electron acceptor

A technology of organic solar cells and electron acceptors, applied in the field of solar cells, can solve problems such as deterioration of photovoltaic performance and decline in exciton separation efficiency, and achieve the effects of low cost, outstanding photovoltaic performance, and excellent thermal stability

Active Publication Date: 2017-10-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Theoretically speaking, when an organic solar cell absorbs light and is heated, these non-fullerene acceptors will undergo intermolecular aggregation and crystallization, and a large phase separation will occur in the active layer, resulting in a decrease in the separation efficiency of excitons and deterioration of photovoltaic performance. Thermal stability of organic solar cells deserves consideration

Method used

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  • Organic solar cell with cyclopentyl bithiophene derivative as electron acceptor
  • Organic solar cell with cyclopentyl bithiophene derivative as electron acceptor
  • Organic solar cell with cyclopentyl bithiophene derivative as electron acceptor

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Experimental program
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Effect test

Embodiment 1

[0018] Using simple and easy-to-obtain cyclopentadithiophene as the initial chemical raw material, by introducing an alkyl side chain, connecting an organotin group on one side, coupling with a difluorophenyl group, connecting an aldehyde group on both sides, and finally connecting with an IC The end groups are connected, and a total of five steps of chemical reactions are used to obtain the target product DFPCIC. The specific synthetic route is as follows:

[0019]

[0020] The specific synthesis steps of DFPCIC are:

[0021] (1) Synthesis of Intermediate 2

[0022] 1.78 g cyclopentadithiophene, 4 g bromoethylhexyl, 1.84 g KOH and 0.24 g KI were dissolved in 40 mL dimethyl sulfoxide (DMSO), and stirred overnight at room temperature. The reaction solution was extracted with ether, the organic phase was collected, washed 3 times with water, and the solvent was removed by rotary evaporation. The crude product was purified with a silica gel column using n-hexane as the eluent...

Embodiment 2

[0033]The transparent conductive glass with strip-shaped ITO (cathode) etched on the surface is cleaned with cleaning agent, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with ultraviolet ozone for 15 minutes; A layer of ZnO was spin-coated at 3500 rpm for 60 seconds, and then annealed at 170° C. for 20 minutes. Then the sheet was transferred to the glove box, and a layer of PFN was spin-coated on the ZnO with a PFN solution of 0.4 mg / mL, the rotating speed was 3000 rpm, and the spin-coating time was 60 seconds. Afterwards, the PBDB-T:DFPCIC mixture with a weight ratio of 1.5:1 and a total concentration of 20 mg / mL was spin-coated at a speed of 2000 rpm for 60 seconds to obtain an active layer with a thickness of 100 nm. Finally, a layer of MoO with a thickness of 10 nm was evaporated with an evaporation apparatus. 3 interface layer and a 100nm thick Ag electrode (anode), resulting in an active area of ​​6 mm 2 organic solar cell...

Embodiment 3

[0036] The transparent conductive glass with strip-shaped ITO (cathode) etched on the surface is cleaned with cleaning agent, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with ultraviolet ozone for 15 minutes; A layer of ZnO was spin-coated at 3500 rpm for 60 seconds, and then annealed at 170° C. for 20 minutes. Then the sheet was transferred to the glove box, and a layer of PFN was spin-coated on the ZnO with a PFN solution of 0.4 mg / mL, the rotating speed was 3000 rpm, and the spin-coating time was 60 seconds. Afterwards, the PBDB-T:DFPCIC mixture with a weight ratio of 1:1 and a total concentration of 20 mg / mL was spin-coated at a speed of 2000 rpm for 60 seconds to obtain a 100 nm-thick active layer. Finally, a layer of MoO with a thickness of 10 nm was evaporated with an evaporation apparatus. 3 interface layer and a 100nm thick Ag electrode (anode), resulting in an active area of ​​6 mm 2 organic solar cells.

[0037] Whe...

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Abstract

The invention discloses an organic solar cell with a cyclopentyl bithiophene derivative as an electron acceptor. The organic solar cell includes a substrate, a cathode, a cathode modification layer, an active layer, an anode modification layer, and an anode. The active layer is a blend membrane of an electron donor and an electron acceptor, wherein the electron donor is PBDB-T, and the electron acceptor is a cyclopentyl bithiophene derivative DFPCIC. By making use of the good molecular planarity and appropriate energy level structure characteristic of DFPCIC, the organic solar cell of the invention has high open-circuit voltage, short-circuit current density and fill factor, and has energy conversion efficiency (PCE) up to 10.14%. Meanwhile, the organic solar cell based on PBDB-T: DFPCIC exhibits excellent thermal stability. In addition, DFPCIC is easy to synthesize, and is beneficial to reducing the cost of the organic solar cell.

Description

technical field [0001] The invention relates to a solar cell, in particular to an organic solar cell using cyclopentadithiophene derivatives as electron acceptors. Background technique [0002] Currently, the active layers of organic solar cells are generally blend films of electron donors and electron acceptors. Traditional electron acceptors are fullerene derivatives such as PC 61 BM and PC 71 BM, etc., but their weak light absorption, the inability to greatly adjust the energy level structure, and the easy aggregation of molecules limit the improvement of the efficiency and stability of organic solar cells. To this end, people are vigorously developing non-fullerene electron acceptors and applying them in the field of organic solar cells. [0003] For example, Zhan Xiaowei from Peking University and others took Yindaprodithienothiophene (IDTT) as the central unit, and connected both sides with electron-withdrawing cyanindanone (IC) end groups through carbon-carbon doub...

Claims

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Application Information

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IPC IPC(8): H01L51/46H01L51/42
CPCH10K85/6576H10K30/20Y02E10/549Y02P70/50
Inventor 施敏敏李水兴占玲玲陈红征
Owner ZHEJIANG UNIV
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