A high-efficiency poly(3-hexylthiophene)-based organic solar cell

An organic solar cell, hexylthiophene technology, applied in the field of solar cells, can solve the problems of unfavorable large-scale application of organic solar cells, narrow light absorption range, difficult synthesis, etc. Effect

Active Publication Date: 2020-04-03
广州追光科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] None of the above non-fullerene acceptors solves the two problems of low energy level and narrow light absorption range at the same time
In addition, the above receptors all use a fused ring group as the central unit, which is difficult to synthesize and high in cost, which is not conducive to the large-scale application of organic solar cells in the future.

Method used

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  • A high-efficiency poly(3-hexylthiophene)-based organic solar cell
  • A high-efficiency poly(3-hexylthiophene)-based organic solar cell
  • A high-efficiency poly(3-hexylthiophene)-based organic solar cell

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Experimental program
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Effect test

Embodiment 1

[0017] DFPCBR is prepared from compound 1 through a three-step reaction, and the synthetic route is as follows:

[0018]

[0019] Among them, compound 1 was synthesized according to the method disclosed in Chinese patent 201710409496.1, and the specific synthesis method of DFPCBR is:

[0020] Under the protection of argon, at -78 ℃, to compound 1 (1.5g, 1.63mmol) in 30mL tetrahydrofuran (THF) solution, n-butyl lithium (n-BuLi) solution (2mL, 2.4 M, 4.8 mmol). The mixture was stirred at -78°C for 2 hours, then trimethyltin chloride solution (9.6 mL, 1M, 9.6 mmol) was added. The mixture was slowly warmed to room temperature and stirred overnight. Another 30 mL of deionized water was added to the mixture, and the mixture was extracted with dichloromethane (DCM). The combined organic phases were washed three times with water and washed with anhydrous MgSO 4 After drying, the solvent was removed by rotary evaporation to obtain compound 2 (orange oil, 1.6 g, 80%). The crude ...

Embodiment 2

[0027] 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 slice was transferred to the glove box, and the methanol solution (0.4mg / mL) of PFN was spin-coated at 3000rpm for 30s. Then, the P3HT:DFPCBR chlorobenzene solution with a weight ratio of 0.8:1 and a total concentration of 20 mg / mL was spin-coated at a speed of 1300 rpm for 60 seconds to obtain an active layer with a thickness of 120 nm. Next, the active layer is annealed at 110° C. for 10 minutes. 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 effective area of ​​6mm 2 organic solar cells....

Embodiment 3

[0030] 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 slice was transferred to the glove box, and the methanol solution (0.4mg / mL) of PFN was spin-coated at 3000rpm for 30s. Then, the P3HT:DFPCBR chlorobenzene solution with a weight ratio of 1:1 and a total concentration of 20 mg / mL was spin-coated at a speed of 1300 rpm for 60 seconds to obtain an active layer with a thickness of 120 nm. Next, the active layer is annealed at 110° C. for 10 minutes. 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 effective area of ​​6mm 2 organic solar cells. ...

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Abstract

The invention discloses a high-efficiency organic solar cell based on poly(3-hexylthiophene), which comprises a substrate, a cathode, a cathode modification layer, an active layer, an anode modification layer and an anode, wherein the active layer is an electron donor and A blend film of electron acceptor, the electron donor is poly(3‑hexylthiophene) (P3HT), and the electron acceptor is the non-fullerene acceptor DFPCBR. Utilizing the large π-conjugated system and strong electron-donating properties of the central unit, DFPCBR has high HOMO energy levels and LUMO energy levels, which form a good match with the energy levels of P3HT, suppressing energy loss, and making solar cells have higher open circuit voltage. At the same time, the intramolecular charge transfer (ICT) of DFPCBR is enhanced, which narrows the band gap and broadens the absorption spectrum. Therefore, the organic solar cell prepared by the invention obtains a relatively high power conversion efficiency (PCE), the highest being 5.34%. At the same time, the organic solar cell prepared by the invention can still maintain a high PCE even when the active layer is relatively thick, which is beneficial to future practical applications.

Description

technical field [0001] The invention relates to a solar cell, in particular to a high-efficiency organic solar cell based on poly(3-hexylthiophene). Background technique [0002] Poly(3-hexylthiophene), referred to as P3HT, is the most widely used and researched electron donor in early organic solar cells. It is simple to synthesize, low in cost, and can adapt to large-area printing processes. Therefore, organic solar cells based on P3HT have Good prospects for commercial application. However, due to the high energy level of P3HT, the highest occupied molecular orbital (HOMO) energy level and the lowest unoccupied molecular orbital (LUMO) energy level are -4.76eV and -2.74eV, respectively, and the fullerene electrons originally matched with P3HT receptors such as PC 61 The LUMO energy level of BM is very low (-3.91eV), causing a large energy loss, resulting in a corresponding open-circuit voltage of the solar cell (V OC ) is low (~0.6V). In addition, P3HT has a wide band...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/46
CPCH10K85/113H10K30/30Y02E10/549
Inventor 施敏敏王宁杨伟涛陈红征
Owner 广州追光科技有限公司
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