Organic solar cell and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10153447-B2
Application number	US-201615387253-A
Country	US
Kind code	B2
Filing date	Dec 21, 2016
Priority date	Jun 27, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

An organic solar cell device is provided, including a first electrode, a photoactive layer, a hole transport layer, and a second electrode that are stacked successively. The photoactive layer includes an electron receptor material and an electron donor material. The electron receptor material is graphene nitride that forms a foamy film on the first electrode and has a three-dimensional network structure. A part of the electron donor material permeates into the graphene nitride, and a part of the electron donor material is enriched on a side of the hole transport layer to form an electron donor enriched layer.

First claim

What is claimed is:

1. An organic solar cell device, comprising:
a first electrode comprising conductive glass;
a photoactive layer, comprising an electron receptor material and an electron donor material, the electron receptor material comprising graphene nitride forming a foamy film on the first electrode and having a three-dimensional network structure;
a hole transport layer;
a second electrode being a metal electrode and stacked successively; and
wherein a part of the electron donor material permeates into the graphene nitride, and a part of the electron donor material is enriched on a side of the hole transport layer to form an electron donor enriched layer, the graphene nitride and the electron donor material form a bulk heterojunction structure.

2. The organic solar cell device according to claim 1 , wherein a thickness of the film formed by the graphene nitride is 10-100 nm.

3. The organic solar cell device according to claim 1 wherein a mass content of a nitrogen element in the graphene nitride is 0.1%-14%.

4. The organic solar cell device according to claim 1 , wherein the graphene nitride forms an electron receptor enriched layer on a side close to the first electrode.

5. The organic solar cell device according to claim 1 , wherein the electron donor material comprises a material comprising a thiophene unit, a material containing a dithienobenzene unit, or a material containing a dithienosilole unit.

6. The organic solar cell device according to claim 5 , wherein the electron donor material comprises at least one of:
poly(3-hexylthiophene);
poly[[9-(1-octylnonyl)-9H-carbazol-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]; or
5;5′-bis[(4-(7-hexylthiophene-2-yl)thiophene-2-yl)-[1,2,5]thiadiazole[3,4-c]pyrimidin]-3;3′-di-2-ethylhexylsilylene-2;2′bithiophene.

7. The organic solar cell device according to claim 1 , wherein a thickness of the photoactive layer is 30-250 nm.

8. The organic solar cell device according to claim 1 , wherein the conductive glass is FTO or ITO conductive glass.

9. The organic solar cell device according to claim 1 , wherein the metal electrode comprises aluminum, silver, or gold.

10. The organic solar cell device according to claim 8 , wherein the hole transport layer comprises molybdenum trioxide or poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate).

11. A method for preparing an organic solar cell device, the method comprising:
ultrasonically dispersing graphene nitride in a mixed solution formed by water and polyethylene glycol, to obtain a graphene nitride dispersion liquid;
coating a first electrode with the graphene nitride dispersion liquid;
performing heat treatment to remove the polyethylene glycol, to obtain a foamy graphene nitride film having a three-dimensional network structure;
coating the foamy graphene nitride film with an electron donor material, wherein a part of the electron donor material permeates into the graphene nitride, and a part of the electron donor material is enriched on the graphene nitride film to form an electron donor enriched layer;
forming a bulk heterojunction structure by the electron receptor material and the electron donor material to obtain a photoactive layer; and
performing vapor deposition at the photoactive layer to successively prepare a hole transport layer and a second electrode, to obtain the organic solar cell device.

12. The method according to claim 11 , wherein a thickness of the foamy graphene nitride film is 10-100 nm.

13. The method according to claim 11 , wherein a concentration of the graphene nitride dispersion liquid is 0.1-10 mg/mL.

14. The method according to claim 11 , wherein manners of the coating comprise blade coating and spin coating, and the heat treatment is performed at 200° C.-500° C.

15. The method according to claim 11 , wherein a number-average molecular weight of the polyethylene glycol is 1000-5000, and a mass concentration of the polyethylene glycol in the mixed solution is 2-10%.

16. The method according to claim 11 , wherein the graphene nitride is prepared in the following manner:
placing graphene oxide in a gas mixture of ammonia and nitrogen;
heating the graphene oxide at 600-1000° C. for 0.5-3 hours;
maintaining the gas mixture flow after the heating stops; and
stopping inputting ammonia when a room temperature is reached, to obtain the graphene nitride.

17. The method according to claim 11 , wherein the graphene nitride is prepared in the following manner:
adding an appropriate amount of urea to an aqueous graphene oxide solution, to obtain a mixed solution;
placing the mixed solution in a polytetrafluoroethylene autoclave;
reacting at 100-250° C. for 6-20 hours, to obtain a solid product; and
after the solid product cools down, filtering, water washing, and drying the solid product to obtain the graphene nitride.

18. The method according to claim 11 , wherein the electron donor material comprises a material comprising a thiophene unit, a material containing a dithienobenzene unit, or a material containing a dithienosilole unit.

19. The method according to claim 11 , wherein the electron donor material comprises at least one of:
poly(3-hexylthiophene);
poly[[9-(1-octylnonyl)-9H-carbazol-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]; or
5;5′-bis[(4-(7-hexylthiophene-2-yl)thiophene-2-yl)-[1,2,5]thiadiazole[3,4-c]pyrimidin]-3;3′-di-2-ethylhexylsilylene-2;2′bithiophene.

20. The method according to claim 19 , wherein a thickness of the photoactive layer is 30-250 nm.

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Hui
• Xia Shengan
• Xie Fengchao

Classifications

• C01P2006/40

  Electric properties · CPC title

• Y02E10/549

  Organic PV cells · CPC title

• H01L51/0043

  Electricity · mapped topic

• H01L51/0003

  Electricity · mapped topic

• H01L51/4253 Primary

  Electricity · mapped topic