CN214797460U

CN214797460U - Preparation and packaging integrated double-sided full perovskite laminated solar cell

Info

Publication number: CN214797460U
Application number: CN202120310354.1U
Authority: CN
Inventors: 宋群梁; 姚燕青; 吕凤
Original assignee: Southwest University
Current assignee: Southwest University
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-11-19
Anticipated expiration: 2031-02-04

Abstract

The utility model provides a full perovskite tandem solar cell of two-sided of preparation encapsulation integration, include: the top perovskite solar sub-cell is used for absorbing short-wavelength waveband sunlight; the bottom perovskite solar sub cell is used for absorbing sunlight transmitted from the top perovskite sub cell; meanwhile, the light entering from the bottom transparent electrode can be absorbed; the transparent electrodes are respectively connected with two ends of the top sub-battery and the bottom sub-battery and are used as electrodes for collecting photocurrent generated by the two sub-batteries, and meanwhile, the transparent electrodes have high transmittance; the top conductive glass is used as a light incidence side and is also used as a substrate for preparing the top perovskite sub-battery; the bottom conductive glass is a substrate for preparing the bottom perovskite sub-cell and is also used for other reflected light entering the device from the bottom; and the edge packaging area is used for isolating water and oxygen in the environment from entering the interior of the device. The process can not only fully absorb the sunlight with the wave band of 300 to 1100 nanometers incident from the front, but also absorb the reflected light entering from the bottom electrode, thereby increasing the photoelectric conversion efficiency of the device; meanwhile, the process can simplify the packaging of the device.

Description

Preparation and packaging integrated double-sided full perovskite laminated solar cell

Technical Field

The utility model relates to a tandem solar cell especially relates to a preparation encapsulation integrated two-sided full perovskite tandem solar cell.

Background

The perovskite cell is a third-generation solar cell developed in recent years, and has the advantages of rich raw materials, low cost, simple preparation process, good tolerance to defects and the like. Currently, laboratory reported single-junction perovskite cells have more than 25% photoelectric conversion efficiency. Approaching its theoretical limit of photoelectric conversion efficiency of 30%. Under the physical laws, the efficiency improvement path of single-junction perovskite cells is becoming narrower and narrower. In order to achieve higher photoelectric conversion efficiency, more and more researches are beginning to focus on forming perovskite solar cells with different band gaps into all perovskite tandem solar cells to obtain higher photoelectric conversion efficiency. The tandem solar cell consists of one wide band gap subcell and one low band gap subcell. The low band-gap sub-cell widens the utilization rate of solar photons, and the high band-gap sub-cell reduces the heat energy loss in the relaxation process after the electrons jump after the high-energy photons are captured by the semiconductor. The laminated cell has higher limit photoelectric conversion efficiency than a single junction cell. However, nowadays, the preparation and the encapsulation of the stacked device are performed separately, and the encapsulation of the bottom electrode side needs to use a large amount of encapsulation glue to completely cover the whole surface; light can only be incident from the top perovskite sub-cell side, while the electrodes of the bottom perovskite sub-cell are typically metal electrodes and cannot utilize light reflected from the bottom.

Disclosure of Invention

In view of the above shortcomings of the prior art, an object of the present invention is to provide a double-sided all-perovskite tandem solar cell with integrated fabrication and packaging for solving the separation of the fabrication and packaging processes of the prior tandem device and realizing the gain of the photoelectric conversion efficiency of the double-sided device.

To achieve the above and other related objects, the present invention provides a double-sided all-perovskite tandem solar cell with integrated package, including:

the top perovskite solar sub-cell is used for absorbing short-wavelength waveband sunlight;

the bottom perovskite solar sub-cell is used for absorbing sunlight transmitted by the top perovskite solar sub-cell and can also absorb light entering from the bottom transparent electrode;

the transparent electrodes are respectively connected with two ends of the top sub-battery and the bottom sub-battery and are used as electrodes for collecting photocurrent generated by the two sub-batteries, and meanwhile, the transparent electrodes have high transmittance;

the top transparent conductive glass is used as a light incidence side and is also used as a substrate for preparing the top perovskite sub-battery;

the bottom transparent conductive glass is a substrate for preparing the bottom perovskite sub-cell and is also used for other reflected light to enter the device from the bottom;

and the edge packaging area is used for isolating water and oxygen in the environment from entering the interior of the device.

As above, the utility model provides a pair of preparation encapsulation integration's two-sided full perovskite tandem solar cell has following beneficial effect:

compare current stromatolite device preparation packaging technology, the utility model discloses a preparation encapsulation integration technology, not only very big reduction preparation encapsulation cost, still realized the photoelectric conversion efficiency gain of two-sided device simultaneously.

Drawings

Fig. 1 shows a schematic diagram of a double-sided all-perovskite tandem solar cell provided by the present invention;

fig. 2 shows a schematic top view of the packaging effect of a double-sided all-perovskite tandem solar cell integrated with packaging according to the present invention.

Description of reference numerals:

1 glass

2 transparent electrode

3 top perovskite sub-battery

4 transparent electrode

5 encapsulating Material

6 inert gas

7 transparent electrode

8-bottom perovskite sub-battery

9 transparent electrode

10 glass

11 encapsulation area

12 cell active area region

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1-2. It should be understood that the structures, ratios, sizes, etc. shown in the drawings are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the practical limit conditions of the present invention, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relation or adjustment of the sizes should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the function and the achievable purpose of the present invention. In addition, the terms "top," "bottom," "middle" and "a" as used herein are for convenience of description and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the appended claims.

Referring to fig. 1, a schematic diagram of a double-sided all-perovskite tandem solar cell integrated with a package structure according to the present invention includes:

the top wide band gap perovskite sub-cell 3 is used for absorbing the sunlight of a short wavelength band;

the top perovskite sub-battery also comprises an electron and hole transport layer which is mainly used for extracting and transporting electrons and holes generated under the illumination.

The top perovskite sub-battery is prepared by depositing a hole transport layer (or an electron transport layer) on transparent conductive glass, wherein the transparent conductive glass comprises two parts, namely glass 1 and a transparent electrode 2, then depositing a wide band gap perovskite active layer and an electron transport layer (or a hole transport layer), and finally depositing a transparent electrode 4.

The perovskite sub-cell 8 with the narrow band gap at the bottom is used for absorbing sunlight transmitted by the perovskite sub-cell at the top and can also absorb light entering from the transparent electrode at the bottom;

the bottom perovskite sub-battery also comprises an electron and hole transport layer which is mainly used for extracting and transporting electrons and holes generated under the illumination.

The bottom perovskite sub-battery is prepared by depositing a hole transport layer (or an electron transport layer) on a transparent conductive glass, wherein the transparent conductive glass comprises two parts of glass 10 and a transparent electrode 9, then depositing a perovskite active layer with a narrow band gap and an electron transport layer (or a hole transport layer), and finally depositing a transparent electrode 7.

And an encapsulating material 5 for encapsulating the two complete top and bottom cells of the same area.

Wherein the two sub-cells are separated by an inert gas 6.

In the embodiment, an integration solution from the preparation of the stacked device to the packaging of the stacked device can be realized by adopting a double-sided all-perovskite stacked solar cell preparation and packaging integration process. The laminated device can be separately prepared in the preparation process, the upper and lower glass cover plates packaged by the laminated device are the glass substrates of the laminated device, and only the periphery of the laminated device needs to be packaged, so that more than 80% of packaging materials can be saved.

Referring to fig. 2, a schematic top view of the packaging effect of the double-sided all-perovskite tandem solar cell integrated with the packaging structure according to the present invention is detailed as follows:

as shown, the device package region 11, is the edge of the top and bottom sub-cells where there is no cell coating. The cell active area region 12, shown as the shaded region in fig. 2, is the active area of the double-sided all-perovskite tandem solar cell in which it actually operates. Sunlight enters the device from the top sub-cell, the top sub-cell absorbs short-wavelength light to generate a photovoltaic effect and outputs work, and the sunlight which penetrates through the top sub-cell and is long in wavelength is absorbed by the bottom sub-cell and outputs work to the outside. Meanwhile, the back surface of the bottom sub-cell is a transparent electrode, and other reflected light can enter the device through the back transparent electrode and is absorbed by the bottom sub-cell, so that additional efficiency gain is generated.

To sum up, compare current stromatolite device preparation packaging technology, the utility model discloses a preparation encapsulation integration technology, not only very big reduction preparation encapsulation cost, still realized the photoelectric conversion efficiency gain of two-sided device simultaneously. Therefore, the utility model discloses effectively overcome present stromatolite solar cell preparation, the detached technological shortcoming of encapsulation and had high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A preparation and packaging integrated double-sided all-perovskite laminated solar cell is characterized by comprising the following steps: the top perovskite solar sub-cell is used for absorbing short-wavelength waveband sunlight;

the transparent electrodes are respectively connected with two ends of the top sub-battery and the bottom sub-battery and are used as electrodes for collecting photocurrent generated by the two sub-batteries, and the transparent electrodes have high transmittance;

2. A fabricated and encapsulated integrated double-sided all-perovskite tandem solar cell according to claim 1, wherein the top perovskite solar sub-cell has a forbidden bandwidth of 1.68-1.9 eV.

3. The solar cell of claim 1, wherein the energy gap of the bottom perovskite solar sub-cell is less than 1.25 eV.

4. The solar cell of claim 1, wherein the transparent electrodes on the glass sides of the two ends of the top-bottom sub-cell are transparent electrodes with conductive glass, and are used as cell substrate glass and packaging glass of the top-bottom sub-cell.

5. The solar cell of claim 1, wherein the bottom transparent electrode is capable of achieving additional photoelectric conversion efficiency.

6. The solar cell of claim 1, wherein the encapsulation region is a peripheral edge region of the stacked device.