CN210723097U

CN210723097U - Multi-junction laminated organic solar cell

Info

Publication number: CN210723097U
Application number: CN201921936793.2U
Authority: CN
Inventors: 金玉; 骆昕; 李志祥; 刘昱玮
Original assignee: Huaqiao University
Current assignee: Huaqiao University
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-06-09
Anticipated expiration: 2029-11-11

Abstract

The utility model discloses a multijunction stromatolite organic solar cell, the utilization is based on PDMS template transcription technique with metal back reflection electrode/bottom polymer subcell transcription to preceding polymer-micromolecule subcell surface, thereby guarantee to prepare the polymer subcell on micromolecule subcell surface, the structure of knot micromolecule subcell before can not destroying simultaneously, each subcell obtains abundant protection, thereby realize that subcell quantity is greater than 5, and at the complemental multijunction stromatolite organic solar cell's of battery absorption spectrum preparation, be favorable to improving organic solar cell's spectral utilization and open circuit voltage.

Description

Multi-junction laminated organic solar cell

Technical Field

The utility model relates to a multijunction stromatolite organic solar cell.

Background

The organic solar cell is a new solar cell developed in the 90 s of the 20 th century, and is a device formed by an organic photoactive layer sandwiched between two electrodes with different polarities. Compared with an inorganic solar cell, the solar cell has the advantages of low cost, simple preparation, large-area manufacturing, flexibility, environmental friendliness and the like, thereby having wide development and application prospects. The unijunction organic solar cell uses a single-layer photoactive layer, so that the absorption spectrum of the organic semiconductor photoactive layer is usually not wide enough, sufficient absorption of sunlight cannot be realized, and the efficiency is low. Therefore, organic solar cells having a stacked structure are attracting attention.

An organic tandem solar cell is a cell in which two or more subcells are connected together with an intermediate connecting layer to form a series or parallel configuration. The solar cell effectively widens the absorption of the solar cell to sunlight by utilizing the complementarity of the spectral absorption of each sub-cell, thereby improving the efficiency of the cell. Thus, the tandem solar cell can obtain higher energy conversion efficiency than the single junction solar cell.

In recent years, tandem solar cells of different structures have been proposed, such as: the structure of the transparent conductive substrate/the polymer sub-cell/the small molecule sub-cell/the back reflection metal electrode, the structure of the transparent conductive substrate/the small molecule sub-cell/the back reflection metal electrode and the structure of the transparent conductive substrate/the polymer sub-cell/the back reflection metal electrode. However, these structures only allow the fabrication of polymer subcells first, followed by the fabrication of small molecule subcells, which limits the use of polymer materials in subcells in contact with the back reflective electrode. With the development of non-fullerene acceptor materials, the absorption spectrum of a non-fullerene-based sub-battery is expanded to the infrared and ultraviolet regions. The polymer sub-cell based on the non-fullerene receptor is introduced into the multijunction laminated organic solar cell, so that the absorption spectrum of the cell can be effectively widened, and the utilization rate of the cell to the solar spectrum is increased. Meanwhile, in order to make the open-circuit voltage of the stacked organic solar cell reach more than 4V, more than 5 sub-cells need to be connected in series in the stacked structure, so that it is very important to adopt small-molecule organic materials and polymer organic materials in different sub-cells respectively.

However, the preparation of the multijunction organic solar cell is still difficult to realize at present, and especially the multijunction organic solar cell with the polymer sub-cell arranged on both sides of the organic small molecule sub-cell is more difficult to realize.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's weak point, provide the organic solar cell of multi-junction stromatolite, solved the problem among the above-mentioned background art.

The utility model provides a technical scheme that its technical problem adopted is: the multi-junction laminated organic solar cell sequentially comprises a transparent conductive substrate, a polymer sub cell, at least three small molecule sub cells connected in series, a bottom polymer sub cell and a metal back reflection electrode, wherein the transparent conductive substrate is a sunlight incidence layer.

In a preferred embodiment of the present invention, the structure of the three-junction series small molecule sub-battery is:

Ag(1nm)/MoO₃(5nm)/SubPc(5nm)/SubPc:C₇₀(1:1,20nm)/C₇₀(10nm)/BCP(4nm)/Ag(1nm)/MoO₃(5nm)/DTDCTB(5nm)/DTDCTB:C₇₀(6:5,20nm)/C70(10nm)/BCP(4nm)/Ag(1nm)/MoO₃(5nm)/AlPcCl(5nm)/AlPcCl:C₇₀(1:1,20nm)/C70(10nm)/BCP(4nm)/Ag(1nm)/MoO₃(5nm)。

in a preferred embodiment of the present invention, the polymer sub-battery structure is:

PEDOT:PSS(60nm)/P3HT：PC₇₁BM(1:0.8,100nm)。

in a preferred embodiment of the present invention, the structure of the bottom polymer sub-battery is: PDPPTPT: PC71BM (1:2,100 nm).

In a preferred embodiment of the present invention, the metal back reflector is a low work function metal electrode, including Al (100nm), Ca/Ag (3nm/100nm), Mg/Ag (3nm/100 nm).

In a preferred embodiment of the present invention, the transparent conductive liner is made of ITO glass or glass with metal film, the metal is Au or Ag, wherein the ITO film, Au or Ag is used as the anode of the device.

Compared with the background technology, the technical scheme has the following advantages:

the utility model discloses the utilization is based on PDMS template transcription technique with metal back reflection electrode, bottom polymer subcell transcribes polymer-micromolecule subcell surface, thereby guarantee to prepare the polymer subcell on micromolecule subcell surface, can not destroy the structure of preceding knot micromolecule subcell simultaneously, each subcell obtains abundant protection, thereby realize that subcell quantity is greater than 5, and at the preparation of the complementary multijunction stromatolite organic solar cell of battery absorption spectrum, be favorable to improving organic solar cell's spectral efficiency and open circuit voltage.

Drawings

Fig. 1 is a schematic structural view of a multi-junction stacked organic solar cell according to the present invention;

FIG. 2 is a schematic diagram of a front sub-cell structure;

FIG. 3 is a schematic diagram of a rear sub-cell structure;

FIG. 4 is a schematic structural diagram of a transfer process of a PDMS template.

Wherein, 1-sunlight, the arrow indicates the incident direction; 2-a transparent conductive substrate; 3-a polymer sub-cell; 4. 5, 6-small molecule sub-battery; 7-bottom polymer subcell; 8-metal back reflective electrode; 9-PDMS substrate.

Detailed Description

Example 1

As shown in fig. 1, the multi-junction stacked organic solar cell of this embodiment sequentially includes a transparent conductive substrate 2, a polymer sub-cell 3, a three-junction series small molecule sub-cell, a bottom polymer sub-cell 7, and a metal back reflective electrode 8, where the transparent conductive substrate is a sunlight incident layer.

The transparent conductive substrate 2 of the present embodiment adopts indium tin oxide ITO glass as the transparent conductive substrate 2, wherein the ITO film is used as the anode of the device; the polymer sub-battery 3 has the structure that: PEDOT PSS (60nm)/P3 HT: PC71BM (1:0.8,100 nm); the bottom polymer sub-cell 7 has the structure: PDPPTPT: PC71BM (1:2,100 nm); the three-layer small molecule sub-battery structure is as follows: ag (1nm)/MoO3(5nm)/SubPc (5nm)/SubPc, C70(1:1,20nm)/C70(10nm)/BCP (4nm)/Ag (1nm)/MoO3(5nm)/DTDCTB (5nm)/DTDCTB, C70(6:5,20nm)/C70(10nm)/BCP (4nm)/Ag (1nm)/MoO3(5nm)/AlPcCl (5nm)/AlPcCl: C70(1:1,20nm)/C70(10nm)/BCP (4nm)/Ag (1nm)/MoO3(5 nm). The metal back reflection electrode 8 is a Ca/Ag composite metal electrode with a layer thickness of 3nm/100nm formed by evaporation.

The preparation method of this example includes the following steps:

1) preparing a polymer sub-battery 3, and a front sub-battery with at least three layers of small molecule sub-batteries stacked in sequence, as shown in fig. 2:

① the transparent conductive substrate 2 is made of Indium Tin Oxide (ITO) glass or glass with metal film, the metal is Au or Ag, the ITO film, Au or Ag is used as the anode of the device;

② preparing each active layer of the organic polymer sub-battery 3 on the surface of the transparent conductive substrate 2 by spin coating;

③ at least three small molecule sub-batteries are deposited on the polymer sub-battery 3 by vacuum thermal deposition to form three-junction series connection, and treated by ozone plasma for 1 s.

2) Preparing a rear sub-cell in which the PDMS substrate 9, the metal back reflection electrode 8 and the bottom polymer sub-cell 7 are stacked in sequence, as shown in FIG. 3:

①, fully mixing the prepolymer of PDMS and a curing agent in a mass ratio of 10:1, preparing a PDMS substrate 9 with the thickness of 2-3 mm in a glass mold through thermal curing, and cutting the PDMS substrate into a set shape to be used as a substrate of a rear sub-cell;

② PDMS substrate 9 was treated with ozone plasma for 5 s;

③ evaporating and plating a layer of Ca/Ag composite metal electrode with the thickness of 3nm/100nm on the PDMS substrate 9 by a vacuum thermal deposition method to obtain a metal back reflection electrode;

④ spin-coating a layer of 10 nm-thick polyethyleneimine on the surface of the Ca/Ag composite metal electrode;

⑤ the bottom polymer sub-cell was prepared on the metal back reflective electrode by spin coating.

3) Transfer of PDMS template:

as shown in fig. 4, the bottom polymer sub-cell 7 of the back sub-cell and the small molecule sub-cell 6 of the front sub-cell are closely attached to each other, pressed by a tool in a glove box protected by nitrogen, and then the PDMS substrate 9 is removed, so as to obtain the multi-junction stacked organic solar cell.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

1. The multi-junction laminated organic solar cell is characterized in that: the solar cell sequentially comprises a transparent conductive substrate, a polymer sub-cell, at least three small molecule sub-cells connected in series, a bottom polymer sub-cell and a metal back reflection electrode, wherein the transparent conductive substrate is a sunlight incidence layer.

2. The multi-junction tandem organic solar cell according to claim 1, wherein the structure of the triple-junction tandem small molecule sub-cell is:

Ag/MoO₃/SubPc/SubPc:C₇₀/C₇₀/BCP/Ag/MoO₃/DTDCTB/DTDCTB:C₇₀/C₇₀/BCP/Ag/MoO₃/AlPcCl/AlPcCl:C₇₀/C₇₀/BCP/Ag/MoO₃。

3. the multi-junction stacked organic solar cell of claim 2, wherein: the thickness of the Ag layer in the micromolecular sub-battery is 1nm, and the Ag layer is MoO₃The layer thickness is 5nm, the SubPc layer thickness is 5nm, and the SubPc: C₇₀、DTDCTB:C₇₀、AlPcCl:C₇₀The thickness of the layer is 20nm and the mass ratio of the two components is 1:1, C₇₀The thickness of the layer was 10nm and the thickness of the BCP layer was 4 nm.

4. The multi-junction stacked organic solar cell of claim 1, wherein the polymer sub-cell structure is: PEDOT PSS/P3 HT: pC₇₁BM。

5. The multi-junction stacked organic solar cell of claim 4, wherein: PEDOT: PSS thickness of 60nm, P₃HT：PC₇₁The mass ratio of BM was 1:0.8 and the thickness was 100 nm.

6. The multi-junction stacked organic solar cell of claim 1, wherein the bottom polymer sub-cell structure is: PDPPTPT: PC (personal computer)₇₁BM。

7. The multi-junction stacked organic solar cell of claim 6, wherein: pdpptptpt: PC (personal computer)₇₁The mass ratio of BM was 1:2 and the thickness was 100 nm.

8. The multi-junction stacked organic solar cell of claim 1, wherein: the metal back reflection electrode is a low work function metal electrode, and the metal of the metal back reflection electrode comprises Al, Ca/Ag and Mg/Ag.

9. The multi-junction stacked organic solar cell of claim 1, wherein: the transparent conductive lining is made of Indium Tin Oxide (ITO) glass or glass with a metal film, the metal is Au or Ag, and the ITO film, the Au or the Ag are used as anodes of the devices.