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An organic solar cell based on non-fullerene acceptors

A non-fullerene acceptor and organic solar cell technology, which is applied in the field of solar cells, can solve the problems of low PCE, high HOMO energy level, and low open circuit voltage of the battery.

Active Publication Date: 2017-06-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons for the low PCE of this type of battery are: 1. P3HT has a wide band gap and cannot absorb sunlight with a wavelength greater than 650nm; 2. The HOMO energy level of P3HT is relatively high (-5.0eV), which is different from the LUMO of the acceptor. The energy level difference of the energy level is small, resulting in the open circuit voltage of the battery (V OC ) becomes smaller
Despite the above disadvantages of P3HT, P3HT is still a very important polymer donor, which has a very high hole mobility (0.6cm 2 V -1 the s -1 ), which makes the device efficiency basically unchanged when the active layer thickness of P3HT-based organic solar cells varies from tens to hundreds of nanometers; in addition, large-area solar cells based on P3HT prepared by industrialized Roll-Roll process, Compared with the small-area solar cells prepared in the laboratory, the device efficiency is only ~30% lower, while the device efficiency of large-area organic solar cells based on other donors is more than 50% lower (Solar Energy Materials and Solar Cells, 2011, 95 ,1348)

Method used

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  • An organic solar cell based on non-fullerene acceptors
  • An organic solar cell based on non-fullerene acceptors
  • An organic solar cell based on non-fullerene acceptors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using 2,2',7,7'-tetrakis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9'-spirobi Fluorene (B 4 -SF) and 3-(5-bromothiophen-2-yl)-2,5-bis(2-ethylhexyl)-6-(5-phenylthiophen-2-yl)-2,5-pyrrolo Synthesis of SF(DPPB) by Suzuki Coupling Reaction of [3,4-c]pyrrole-1,4-dione(Br-DPPB) 4 , the reaction equation is:

[0023]

[0024] Among them, B 4 -SF was synthesized by the method reported in the document Chemical Communication, 2012, 48, 11847, and Br-DPPB was synthesized by the method reported in the document Journal of Materials Chemistry A, 2015, 3, 1902. SF(DPPB) 4 The synthesis steps are:

[0025] In a 250mL two-neck round bottom flask, add 0.146g B 4 -SF, 0.721g Br-DPPB and 2.212g K 2 CO 3 , then add 50mL toluene, 3mL ethanol and 8mL water, build a closed reaction reflux device, freeze the mixed solution with liquid nitrogen, and then carry out three cycles of vacuuming and filling nitrogen, under the protection of nitrogen, add 50mg Pd(PPh 3 ) 4 As a cataly...

Embodiment 2

[0028]The transparent conductive glass with strip-shaped ITO (anode) etched on the surface was cleaned with cleaning agent, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with oxygen plasma for 15 minutes; The aqueous solution of the mixture of PEDOT and PSS was spin-coated on the surface at a speed of 3000r / min, and dried at 150°C for 10 minutes to obtain a 30nm-thick blend film of PEDOT and PSS (anode modification layer); then, spin-coat P3HT on it with SF(DPPB) 4 The mixed solution, the rotating speed is 3000r / min, the total concentration of the solution is 15mg / ml, the solvent is chloroform, P3HT and SF (DPPB) 4 The weight ratio is 2:1, and the spin coating time is 40 seconds to obtain a layer of P3HT and SF(DPPB) with a thickness of 100nm. 4 The blend film (active layer); 120 ° C annealing treatment for 10 minutes; then spin coat a layer of PFN (cathode modification layer) on the active layer, the rotating speed is 3000r / min, ...

Embodiment 3

[0032] The transparent conductive glass with strip-shaped ITO (anode) etched on the surface was cleaned with cleaning agent, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with oxygen plasma for 15 minutes; The aqueous solution of the mixture of PEDOT and PSS was spin-coated on the surface at a speed of 3000r / min, and dried at 150°C for 10 minutes to obtain a 30nm-thick blend film of PEDOT and PSS (anode modification layer); then, spin-coat P3HT on it with SF(DPPB) 4 The mixed solution, the rotating speed is 3000r / min, the total concentration of the solution is 15mg / ml, the solvent is chloroform, P3HT and SF (DPPB) 4 The weight ratio is 2:1, and the spin coating time is 40 seconds to obtain a layer of P3HT and SF(DPPB) with a thickness of 100nm. 4 The blended membrane (active layer) of the active layer; then a layer of PFN (cathode modification layer) is spin-coated on the active layer, the rotating speed is 3000r / min, and the conc...

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Abstract

The present invention disclosed an organic solar cell based on non -preders.It includes substrate, anode, anode modification layer, active layer, cathode modification layer, and cathode. Among them, the active layer is a co -mixture of the aggregate 3‑ 己 噻 (P3HT) and non -teeenne receptor SF (DPPB) 4.The weight ratio of P3HT and SF (DPPB) 4 in the active layer is 1: 1 ~ 4: 1, and the thickness of the active layer is 50 to 200 nm.Using SF (DPPB) 4 suitable LUMO energy level and wide absorption spectrum and other characteristics, the organic solar battery prepared by the present invention has a high opening voltage VOC (1.00 ~ 1.21 V) and the widening spectral response range (300‑710NM), the highest energy conversion efficiency (PCE) is 4.00%, which is better than the efficiency of organic solar cells (PCE = 3.18%) of organic solar batteries using Fullene receptor PC61BM under the structure of the same device.

Description

technical field [0001] The invention relates to a solar cell, in particular to an organic solar cell based on a non-fullerene acceptor. Background technique [0002] Compared with traditional inorganic solar cells, organic solar cells have received extensive attention because they can be fabricated into lightweight, ultra-thin, large-area flexible devices by low-cost solution processing methods, and have sparked a research boom. At present, the active layer of organic solar cells adopts a bulk heterojunction formed by blending donors and acceptors. After more than 20 years of continuous research, mainly due to the successful development of various new donor materials (including polymer donors and small molecule donors) and the optimization of device structures, organic solar cells have made rapid progress. According to It is reported that the highest power conversion efficiency (PCE) of single-junction polymer solar cells and small molecule solar cells has reached ~10% (Nat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K85/624H10K30/20Y02E10/549
Inventor 施敏敏李水兴刘文清陈红征
Owner ZHEJIANG UNIV