CN211828834U

CN211828834U - Organic solar cell structure containing graphene intermediate layer

Info

Publication number: CN211828834U
Application number: CN202020944455.XU
Authority: CN
Inventors: 张信康; 肖慧萍; 叶世棋; 彭贻涛; 姚朝凯; 张宇国; 陈佳伟; 陈翔; 黄宝莹
Original assignee: Nanchang Hangkong University
Current assignee: Nanchang Hangkong University
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-10-30
Anticipated expiration: 2030-05-29

Abstract

The utility model relates to a solar cell structure especially is an organic solar cell structure that contains graphite alkene intermediate level, and it has negative pole and positive pole, wherein, be equipped with active layer, graphite alkene layer, ZnO nanostructured layer and PEDOT between negative pole and the positive pole in proper order: and (4) a PSS layer. The ZnO nanostructure layer has a one-dimensional ordered nanostructure, grows densely and uniformly on the surface of the graphene layer, can be well connected with graphene, enables holes transmitted from the graphene to maintain efficient transmission, and is not easy to quench. The utility model discloses a solar cell for more positive poles that the hole reachd organic solar cell, thereby effectively promote organic solar cell's photoelectric conversion efficiency.

Description

Organic solar cell structure containing graphene intermediate layer

Technical Field

The utility model relates to an organic solar cell structure, especially an organic solar cell structure that contains graphite alkene intermediate level.

Background

The human initiation of solar energy research began with the photovoltaic effect discovered in 1939 a.e. becquerel. Since the last 50 s, inorganic solar cells such as monocrystalline silicon, polycrystalline silicon, and cadmium sulfide have been dominant in the solar cell market. However, inorganic solar cells have the disadvantages of complex process, high cost, severe environmental pollution and the like, and further popularization and application of the inorganic solar cells are limited (Cheng YJ, et.al. The organic polymer solar cell has the characteristics of low cost, simple process, rich raw material sources, environmental protection, easy chemical modification of materials and the like, and gradually becomes a research hotspot in the photovoltaic field after the 1960 s; meanwhile, the device has the advantages of being capable of being prepared into a flexible, portable and semitransparent battery, and the like, so that the device attracts extensive attention and research of researchers at home and abroad and becomes a mainstream research direction in the photoelectric field.

For organic solar cells, the biggest bottleneck is how to further improve the photoelectric conversion efficiency. For this reason, the mainstream structure of the active layer material of the organic polymer solar cell is designed to be a bulk heterojunction structure, that is, in the active layer, a donor material (such as P3HT (3-hexyl polythiophene)) and an acceptor material (such as PCBM) are blended in a nanometer scale to form an interpenetrating network structure, so that the contact area between the two can be significantly increased, and the separation of holes and electrons in excitons is facilitated. However, in the case of an organic polymer solar cell, after holes and electrons are separated in an active layer, the mobility of holes in a donor material and a subsequent material layer is too low, and the holes are easily quenched in the process of reaching a positive electrode, which makes it difficult to further improve the photoelectric conversion efficiency. In the research, it is found that the improvement of the hole transport rate of the solar cell has an important significance, and therefore, the invention discloses an organic solar cell structure containing a graphene intermediate layer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the defect that proposes in the above-mentioned background art through proposing the organic solar cell structure that contains the graphite alkene intermediate level.

The utility model adopts the technical scheme as follows: an organic solar cell structure containing a graphene interlayer comprises a cathode 5 and an anode 1, wherein an active layer 4, a graphene layer 3, a ZnO nanostructure layer 6 and PEDOT are sequentially arranged between the cathode 5 and the anode 1: PSS layer 2.

As an optimized technical solution of the present invention, the thickness of the graphene layer 3 is 3-6 nm.

As a preferred technical solution of the present invention, the thickness of the active layer 4 is 20-30 nm.

As a preferred embodiment of the present invention, the negative electrode 5 is deposited on the active layer in an H-shape.

As an optimized technical scheme of the utility model, anodal 1 is the ITO electrode.

As an optimized technical solution of the present invention, the PEDOT: and a hole transport layer 7 is also arranged between the PSS layer 2 and the ZnO nanostructure layer 6.

The utility model discloses a joint of active layer and graphite alkene layer, graphite alkene material have regular two-dimensional planar structure who arranges, the transmission of easy hole in graphite alkene material to promote the hole mobility. The ZnO nanostructure layer has a one-dimensional ordered nanostructure, grows on the surface of the graphene layer compactly and uniformly, is well connected with the graphene, can enable holes transmitted from the graphene to maintain efficient transmission, and is not easy to quench. The utility model discloses an organic solar cell structure that contains graphite alkene intermediate level can be so that more positive poles that the hole reachd organic solar cell to promote organic solar cell's photoelectric conversion efficiency.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

fig. 2 is a schematic diagram of an explosion structure of embodiment 1 of the present invention;

fig. 3 is a schematic diagram of an explosion structure in embodiment 2 of the present invention.

The reference numbers illustrate:

1-positive electrode; 2-PEDOT: a PSS layer; 3-a graphene layer; 4-an active layer; 5-negative pole; 6-ZnO nanostructure layer; 7-hole transport layer.

Detailed Description

It should be noted that, in the present application, features of embodiments and embodiments can be combined with each other without conflict, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

referring to fig. 1 to 2, the preferred embodiment of the present invention provides an organic solar cell structure including a graphene intermediate layer, which has a negative electrode aluminum 5 and an ITO electrode 1, wherein an active layer 4, a graphene layer 3, a ZnO nanostructure layer 6, and PEDOT are sequentially disposed between the negative electrode aluminum 5 and the ITO electrode 1: and the PSS layer 2, and the ZnO nanostructure layer 6 has a one-dimensional ordered nanostructure.

And (3) mixing PEDOT: PSS was spin coated on ITO electrode 1 and air dried to form 3nm thick PEDOT: PSS layer 2.

In the PEDOT: and preparing a ZnO nanostructure layer 6 with specific orientation and thickness (30nm) on the PSS layer 2 by adopting a hydrothermal method. Specifically, zinc acetate was placed in a screw-down lidded container, mixed with deionized water, and to this was gradually added dropwise ammonia and shaken until the solution became clear. The ITO electrode 1 (which has been spin coated with PEDOT: PSS layer 2) with the ZnO nanostructured thin film grown is then immersed in a vessel. And then, putting the container into an oven with the temperature of 80 ℃ for heating for 24h, then taking out the ITO electrode 1, and washing the ITO electrode 1 by deionized water until no residue is left on the surface to obtain the ITO electrode 1 with the one-dimensional ordered ZnO nanostructure layer 6, wherein the thickness of the ITO electrode 1 is 30 nm.

And spin-coating a graphene layer 3 with the thickness of 3nm on the ZnO nano-structure layer 6 with one-dimensional order, and then naturally air-drying.

An active layer 4 with a thickness of 20nm is spin-coated on the graphene layer 3, and then is naturally air-dried. Wherein the active layer 4 was previously physically blended with PCBM (1:1m/m) using P3HT on a nanoscale.

An aluminum electrode with the thickness of 10nm is vapor-plated on the graphene layer 3 to serve as a negative electrode 5, wherein the aluminum electrode is vapor-plated on the active layer in an H shape, so that sufficient electrons are returned to the negative electrode, the light transmission performance can be improved, the active layer can absorb sunlight as much as possible, and more holes and electrons are generated.

Additionally, PEDOT: the PSS layer, the graphene layer 3 and the active layer 4 are all formed by spin coating using a spin coater, and the methods thereof are all the existing mature technologies and are only disclosed herein.

Example 2:

referring to fig. 3, it is the same technical solution as the embodiment 1, except that PEDOT: and a hole transport layer 7 with the thickness of 3nm is further spun between the PSS layer 2 and the ZnO nanostructure layer 6, and the material of the hole transport layer 7 is N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine (NPB).

It should be added that the hole transport layer 7 is formed by spin coating with a spin coater, and the methods are well-known and are only disclosed herein.

Comparative example 1:

the same technical solution as in example 1 is adopted, except that the graphene layer 3 is not provided between the active layer 4 and the ZnO nanostructure layer 6.

Comparative example 2:

the same technical solution as that of example 1, except that the graphene layer 3 and PEDOT: the ZnO nanostructure layer 6 is not arranged between the PSS layers 2.

Test example

For the above examples and comparative examples, hole mobility and photoelectric conversion efficiency were tested.

Hole mobility was measured using the Space Charge Limited Current (SCLC) method, and the device structures tested were the structures described in examples 1-2 and comparative examples 1-2, respectively.

Photoelectric conversion efficiency was measured in a nitrogen glove box using a semiconductor current voltage source (Keithley 236). The conditions tested were all performed under a standard sun. The device structures tested were the structures described in examples 1-2 and comparative examples 1-2, respectively.

The results obtained are given in the following table:

	hole mobility (cm)²V^-1S^-1)	Photoelectric conversion efficiency (PCE%)
			Example 1	8.3×10^-3	5.4
Example 2	9.0×10^-3	5.8
			Comparative example 1	6.1×10^-4	3.9
Comparative example 2	3.1×10^-3	4.3

It can be known through the comparison, through the increase of graphite alkene layer 3 and ZnO nanostructured layer 6, obviously improved hole mobility and photoelectric conversion efficiency to in PEDOT: after the hole transport layer 7(NPB) with the thickness of 3nm is spin-coated between the PSS layer 2 and the ZnO nanostructure layer 6, the hole mobility and the photoelectric conversion efficiency can be further improved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An organic solar cell structure comprising a graphene interlayer, having a negative electrode (5) and a positive electrode (1), characterized in that: be equipped with active layer (4), graphite alkene layer (3), ZnO nanostructured layer (6) and PEDOT between negative pole (5) and positive pole (1) in proper order: a PSS layer (2).

2. The graphene interlayer-containing organic solar cell structure of claim 1, wherein: the thickness of the graphene layer (3) is 3-6 nm.

3. The graphene interlayer-containing organic solar cell structure of claim 1, wherein: the thickness of the active layer (4) is 20-30 nm.

4. The graphene interlayer-containing organic solar cell structure of claim 1, wherein: the negative electrode (5) is deposited on the active layer in an H-shape.

5. The graphene interlayer-containing organic solar cell structure of claim 1, wherein: the positive electrode (1) is an ITO electrode.

6. The graphene interlayer-containing organic solar cell structure of claim 1, wherein: the PEDOT: and a hole transport layer (7) is also arranged between the PSS layer (2) and the ZnO nano-structure layer (6).