阅读说明：本技术 一种漂浮在水面上的叠层太阳能电池 (Laminated solar cell floating on water surface ) 是由 宋群梁 姚燕青 吕凤 于 2021-01-30 设计创作，主要内容包括：本发明涉及一种漂浮在水面上的叠层太阳能电池,由顶部宽带隙太阳能子电池、底部窄带隙太阳能子电池、四周的封装材料以及封装在上下子电池之间的惰性气体组成。顶部宽带隙太阳能子电池用于吸收短波长波段的太阳光；底部窄带隙太阳能子电池,用于吸收从顶部宽带隙子电池透过的太阳光；四周封装支撑材料将上下两个子电池封装起来,起隔绝水氧的作用；将两个子电池封装的同时,中间会形成中空区域,使用惰性气体填充,该中空设计可以产生足够的浮力,使整个叠层组件漂浮在水面上。一种漂浮在水面上的叠层太阳能电池不仅能达到叠层太阳能电池的效果,还能够使其在无其它漂浮物辅助的情况下漂浮在水面上,可以极大的降低水上光伏电站的建设成本。(The invention relates to a laminated solar cell floating on a water surface, which consists of a top wide-band-gap solar sub-cell, a bottom narrow-band-gap solar sub-cell, a peripheral packaging material and inert gas packaged between the upper sub-cell and the lower sub-cell. The top wide-band-gap solar sub-cell is used for absorbing sunlight in a short wavelength band; the bottom narrow-band-gap solar sub-cell is used for absorbing sunlight transmitted by the top wide-band-gap sub-cell; the upper and lower sub-batteries are packaged by the surrounding packaging support materials to play a role in isolating water and oxygen; when the two sub-batteries are packaged, a hollow area is formed in the middle and filled with inert gas, and the hollow design can generate enough buoyancy to enable the whole laminated assembly to float on the water surface. The utility model provides a photovoltaic power plant's on water construction cost can greatly be reduced that the tandem solar cell that floats on the surface of water can not only reach the effect of tandem solar cell, can also make it float on the surface of water under the supplementary condition of no other floater, can be very big.)

1. A tandem solar cell floating on a water surface, comprising: (1) a top sub-cell substrate; (2) a bottom subcell substrate; (3) the top wide-band-gap solar sub-cell is used for absorbing short-wavelength waveband sunlight; (4) the bottom narrow-band-gap solar sub-cell is used for absorbing sunlight transmitted from the top perovskite sub-cell; (5) the periphery of the upper sub battery is encapsulated with a support material which is used for encapsulating the upper sub battery and the lower sub battery and plays a role in isolating water and oxygen; (6) the hollow structure produced by encapsulation and the inert gas filled in the hollow structure can generate enough buoyancy, so that the whole laminated assembly floats on the water surface, and meanwhile, the inert gas can be used for protecting internal devices, and the service life is longer.

2. The above-surface-floating tandem solar cell of claim 1, wherein said top wide-bandgap solar subcell has a forbidden band width between 1.65-1.9 eV.

3. The surface-floating tandem solar cell of claim 1, wherein said top wide bandgap solar subcell is fabricated directly on a top packaging substrate.

4. The surface-floating tandem solar cell of claim 1, wherein said top wide bandgap solar subcell is transparent.

5. The above-surface solar cell of claim 1, wherein the bottom narrow bandgap solar subcell has a forbidden band width below 1.25 eV.

6. The above-water-surface solar cell stack according to claim 1, wherein the upper and lower two-terminal cells have a 4-terminal stack structure.

7. The above-surface solar cell stack of claim 1, wherein the distance between the sub-cells is adjustable according to the desired buoyancy.

8. The above-water-surface tandem solar cell according to claim 1, wherein the solar cell is not only used in a single tandem cell application, but also in a module application and an array type packaging application.

Technical Field

The invention relates to the field of solar cells, in particular to a laminated solar cell floating on water surface.

Background

With the increasing shortage of land resources, the problem of difficult land utilization of photovoltaic power stations becomes a main contradiction restricting photovoltaic development. A solar photovoltaic power station is built on the water surface to build a fishing light-integrated and water-light-integrated application mode, and the solar photovoltaic power station becomes a new idea for leading the development of the photovoltaic industry at present. Regarding the construction of the above-water photovoltaic system, the above-water photovoltaic system is mainly divided into an above-water piling type and an above-water floating platform type. The photovoltaic system foundation construction difficulty of pile formula of piling on water is great, need draw water earlier, then down pile, fixed bolster again, still can receive the water level restriction. Floating-deck formula photovoltaic system on water, it requires highly to flotation device, and floating-deck photovoltaic needs flotation device to support photovoltaic cell panel on water, and the equal requirements such as body pallet anti-corrosion performance, low density, frost heaving resistance, anti-wind wave, life-span, bearing capacity are higher, and the construction cost is very high. These two kinds of photovoltaic systems on water all face the problem that the construction cost is high, are unfavorable for photovoltaic power plant's on water application and popularization.

Disclosure of Invention

In view of the above-mentioned disadvantages, the present invention provides a solar cell module floating on water, which is used to solve the problem of high construction cost of the existing waterborne photovoltaic system.

To achieve the above and other related objects, the present invention provides a tandem solar cell floating on a water surface, comprising:

and the top packaging substrate is transparent conductive glass. The substrate serves as a top packaging layer and also serves as a preparation substrate of the top wide band gap sub-battery;

the top wide band gap sub-cell has a forbidden band width of 1.65-1.9eV, and is used for absorbing short-wavelength waveband sunlight;

the bottom sub-cell substrate is used for placing and fixing a narrow-band-gap bottom sub-cell as a bottom packaging layer;

a bottom narrow bandgap solar subcell for absorbing sunlight transmitted from the top subcell;

the periphery of the battery is encapsulated with a supporting material which is used for encapsulating the upper sub-battery and the lower sub-battery, plays a role in isolating water and oxygen and simultaneously plays a role in supporting, so that the upper sub-battery and the lower sub-battery are separated to form a hollow structure;

the hollow structure produced by encapsulation and the inert gas filled in the hollow structure can generate enough buoyancy to enable the whole laminated assembly to float on the water surface, and meanwhile, the inert gas can be used for protecting internal devices and obtaining longer service life.

As described above, the tandem solar cell floating on the water surface provided by the invention has the following beneficial effects: compared with the existing floating platform type solar cell-battery and floating platform separated structure, the invention adopts the integrated structure of the battery and the floating platform, the battery can float on the water surface independently, and other floating devices are not needed, so that the construction cost of the photovoltaic power station on the water surface can be greatly reduced.

Drawings

Fig. 1 is a schematic view illustrating a stacked solar cell floating on a water surface according to the present invention, and fig. 2 is a schematic view illustrating an encapsulation effect of the stacked solar cell floating on the water surface according to the present invention;

description of reference numerals:

1 a top package substrate;

2 a bottom package substrate;

3 a top wide bandgap sub-cell;

4 bottom narrow bandgap subcells;

5, packaging a supporting material around the substrate;

6 an inert gas;

7 'loop' shaped packaging area;

8 active area regions of the cell.

Detailed Description

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

Referring to fig. 1, it should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope covered by the disclosure of the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms "top", "bottom", "middle", "upper" and "lower" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the modifications may be changed or adjusted without substantial technical change.

Referring to fig. 1, a schematic diagram of a tandem solar cell floating on water according to the present invention includes: and a top packaging substrate 1, wherein the substrate is transparent conductive glass, namely, the substrate serves as a top packaging layer and also serves as a preparation base of the top wide band gap sub-battery.

The top wide band gap sub-cell 3 is prepared on the top packaging substrate 1, and the counter electrode of the top wide band gap sub-cell is a transparent electrode and is used for transmitting sunlight which is not absorbed by the top wide band gap sub-cell;

the bottom package substrate 2 has the following features, such as light weight, excellent weather resistance, good waterproof performance, good mechanical performance, etc., and may be a glass substrate, an acrylic plate, etc., but is not limited thereto.

The top package substrate 1 is the same size as the bottom package substrate 2.

A bottom narrow bandgap subcell 4 fixed on the bottom packaging substrate 2 for absorbing the sunlight transmitted from the top wide bandgap subcell.

The top wide bandgap subcell 3 is the same size as the bottom narrow bandgap subcell 4 in effective area.

The packaging support material 5 may be a "loop" shaped acrylic plate (not limited thereto), the external dimension of which is the same as the size of the upper and lower packaging substrates, and the internal dimension of which is slightly larger than the effective area of the two sub-batteries, and a hollow area is generated inside the two sub-batteries under the support of the packaging material, so as to provide buoyancy for the battery pack to float on the water surface.

The packaging process comprises the following steps: (1) the bottom sub-cell 4 is fixed centrally on the bottom package substrate 2; (2) fixing the lower half part of the packaging support material 5 along the outer edge of the bottom packaging substrate 2; (3) transferring the top wide band gap sub-battery 3 prepared on the top packaging substrate 1 and the semi-finished product with the fixed lower half part into an inert atmosphere; (4) covering the top battery on the bottom battery with the lower half part fixed with the 'hui' shaped packaging material in an inert atmosphere, and fixedly packaging; (5) and (6) detecting the air tightness.

Referring to fig. 2, a schematic diagram of an effect of the stacked solar cell package floating on the water surface according to the present invention is detailed as follows:

as shown, the "wrap around" shaped encapsulant region 7 is at the edge of the top and bottom subcells where there is no cell active portion. The cell active area region 8, shown as the shaded area in fig. 2, is the active area of the stacked 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.

In conclusion, compared with the existing water floating platform type solar cell, the solar cell and the floating platform are integrally designed, so that the construction cost of the water surface photovoltaic power station is greatly reduced, and the high photoelectric conversion efficiency of the stacked device is realized. Therefore, the solar cell and the method effectively overcome the defect of high installation cost of the existing water surface floating solar cell and have high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can 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.