High-efficiency ternary organic solar cell based on non-fullerene acceptor alloy

A non-fullerene acceptor, organic solar cell technology, applied in the field of solar cells, achieves the effects of good mutual solubility, improved exciton separation efficiency and strong crystallinity

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a second non-fullerene acceptor to prepare a ternary non-fullerene battery is theoretically feasible, but there is currently no ternary non-fullerene battery with an active layer thickness in the range of 100-300nm and a PCE exceeding 14%. Literature Reports on Lene Batteries

Method used

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  • High-efficiency ternary organic solar cell based on non-fullerene acceptor alloy
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  • High-efficiency ternary organic solar cell based on non-fullerene acceptor alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] BTP-M is synthesized by one-step Knoevenagel reaction, and the specific synthetic route is as follows figure 1 shown.

[0022] The specific synthesis steps of BTP-M are:

[0023] Compound 1 (0.1 g, 0.1 mmol), compound 2 (0.1 g, 0.5 mmol) and dry chloroform (30 mL) were added to the Slack tube, the mixture was frozen with liquid nitrogen, pumped three times, and thawed. Under nitrogen, 0.4 mL of pyridine was added, and then refluxed at 65° C. for 15 h. After removing the solvent, it was purified by column (eluent: petroleum ether:dichloromethane=1:1~0:1, v / v) to obtain a brown solid (85 mg, 60%).

[0024] 1 H NMR (400MHz, CDCl3): δ=9.10(s, 2H), 8.54(d, J=8.1Hz, 0.7H), 8.46(s, 1.3H), 7.87(d, J=7.6Hz, 1.3H) ,7.77(s,0.7H),7.61-7.51(m,2H),4.79(d,J=7.2Hz,4H),3.21(s,4H),2.57(d,J=6.1Hz,6H),2.17 (s,2H),1.95-1.79(m,4H),1.54-1.43(m,4H),1.41-1.17(m,32H),1.15-0.94(m,12H),0.91-0.74(m,12H) ,0.67(t,J=7.2Hz,6H).

[0025] MS(MALDI-TOF): Calcd for C 84 h 94 N 8 o 2 S 5 (M + )...

Embodiment 2

[0029] The transparent conductive glass with strip-shaped ITO (anode) 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; Spin-coat a layer of PEDOT:PSS with a thickness of 20 nm on the surface at a rotation speed of 4500 rpm, and then anneal at 170° C. for 20 minutes. Then the sheet was transferred to the glove box, and the mixed solution of PM6:Y6 (total weight ratio of 1:1.2) added with 0.5% chloronaphthalene (CN) with a total concentration of 16 mg / mL was spin-coated at a speed of 3500 rpm for 30 seconds, a 115nm thick active layer was obtained. The active layer is annealed at 100° C. for 10 minutes. Then on the active layer, a 5 nm thick PFN-Br transport layer was spin-coated with 0.5 mg / mL PFN-Br methanol solution. Finally, a layer of Ag electrode (cathode) with a thickness of 100nm is vapor-deposited with an evaporation apparatus to obta...

Embodiment 3

[0034] The transparent conductive glass with strip-shaped ITO (anode) 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; Spin-coat a layer of PEDOT:PSS with a thickness of 20 nm on the surface at a rotation speed of 4500 rpm, and then anneal at 170° C. for 20 minutes. Then the sheet is transferred to the glove box, the BTP-M added with 15% (the weight ratio of BTP-M in the acceptor), the chloronaphthalene (CN) added with 0.5%, the total concentration of PM6 at 16mg / mL :Y6:BTP-M (the total weight ratio of donor and acceptor is 1:1.2) mixed solution, spin coating for 30 seconds at a speed of 3500 rpm, to obtain an active layer with a thickness of 115 nm. The active layer is annealed at 100° C. for 10 minutes. Then on the active layer, a 5 nm thick PFN-Br transport layer was spin-coated with 0.5 mg / mL PFN-Br methanol solution. Finally, a layer of...

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Abstract

The invention discloses a high-efficiency ternary organic solar cell based on a non-fullerene receptor alloy, which comprises a substrate, an anode, an anode modification layer, an active layer, a cathode modification layer and a cathode, and is characterized in that the active layer is a polymer donor PM6 and non-fullerene receptor alloy blended film; and the non-fullerene receptor alloy is a Y6:BTP-M alloy formed by mixing two non-fullerene receptors Y6 and BTP-M according to a certain proportion. By using the higher energy level and weaker crystallinity of BTP-M relative to Y6, the Y6: BTP-M alloy optimizes the energy level and morphology of the active layer at the same time, so that the PM6: Y6: BTP-M ternary organic solar cell obtains higher voltage and current than a PM6: Y6 binarycell; and finally, the highest energy conversion efficiency (PCE = 17.03%) of the existing single-junction organic solar cell is realized. Besides, the performance of the ternary organic solar cell isnot sensitive to the thickness of the active layer, and the PCE is 14% or above when the thickness of the active layer is 120-300 nm.

Description

technical field [0001] The invention relates to a solar cell, in particular to a high-efficiency ternary organic solar cell based on a non-fullerene acceptor alloy. Background technique [0002] In recent years, with the help of the rapid development of non-fullerene acceptors, organic solar cells have achieved rapid improvement in terms of power conversion efficiency (PCE). In particular, the non-fullerene acceptor Y6 developed by Zou Yingping’s research group at Central South University has a narrow bandgap, and the photovoltaic response range can be extended to about 930nm. At the same time, Y6 has strong crystallinity, which improves the electron mobility. The PCE of the resulting binary organic solar cell exceeded 15% (Joule, 2019, 3, 1140), which strongly promoted the progress of organic solar cells. [0003] Constructing ternary organic solar cells by adding a third component is an effective way to further improve energy conversion efficiency. For example, Ge Ziyi’s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46
CPCH10K85/00H10K30/00Y02E10/549
Inventor 陈红征占玲玲李水兴施敏敏李寒莹
Owner ZHEJIANG UNIV
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