A novel organic solar cell large-area module

Abstract

The utility model discloses a novel organic solar cell large area module, including a plurality of series connection's sub -cell, and each sub -cell comprises bottom electrode layer, hole transport layer, active layer, electron transport layer and top electrode layer from bottom to top in proper order, wherein, the surface shape of top electrode layer is the square of a plurality of square units or the regular polygon of a plurality of triangle units or the circle of a plurality of fan units or the circle of a plurality of concentric circle, the utility model is compatible with the design of a plurality of module of special-shaped base, and expands application scenario.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, and in particular to a novel large-area organic solar cell module. Background Technology

[0002] With the rapid development of organic solar cell materials, the efficiency of small-area devices has approached 20%, but the efficiency of large-area modules (>100 cm²) still decreases significantly. The main reasons include: 1. Ineffective area ("dead zone"): In traditional series modules, the laser-etched area and electrode connections occupy a large area, leading to light absorption loss. 2. Structural design limitations: Existing modules mostly use rectangular or strip-shaped segments, making it difficult to adapt to irregularly shaped substrates such as circles and polygons, and the series path is complex. 3. Insufficient manufacturing precision: Etching process errors (such as x, y offsets) can easily cause short circuits or open circuits between adjacent cells, affecting yield. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to provide a novel large-area organic solar cell module, which achieves high fill factor and low process sensitivity through geometric segmentation optimization and etching region design, thereby solving the problems existing in the background technology.

[0004] Technical solution: The present invention discloses a novel large-area organic solar cell module, comprising several sub-cells connected in series. Each sub-cell comprises, from bottom to top, a bottom electrode layer, a hole transport layer, an active layer, an electron transport layer, and a top electrode layer. The surface shape of the top electrode layer is a square composed of several rectangular units, a regular polygon composed of several triangular units, a circle composed of several sector units, or a circle composed of several concentric rings.

[0005] Furthermore, the bottom electrode layer is made of indium tin oxide (ITO) glass.

[0006] Furthermore, when the surface of the top electrode layer is a square composed of rectangular units, the square module is divided into four small rectangular units, with vertical bisectors on adjacent sides, and an etching region P1 is formed on the ITO substrate along the vertical bisectors; an etching region P2 is provided at a distance x in front of P1 of the three adjacent units, and P2 only removes the active layer and the interface layer; an etching region P3 is provided at a distance y in front of P2, and P3 removes electrode B, the active layer, and the interface layer; wherein, 0≤x<0.1mm, 0≤y<0.1mm.

[0007] Furthermore, the square module is divided into four small triangular units along the diagonal direction, forming an etched region P1 on the ITO substrate along the diagonal direction.

[0008] Furthermore, when the surface of the top electrode layer is a regular polygon composed of triangular units, the regular polygon module is divided into several small triangular units along the diagonal direction, and an etched region P1 is formed on the ITO substrate.

[0009] Furthermore, when the surface of the top electrode layer is a circle composed of fan-shaped units, the circular module is divided into several fan-shaped units along the radial direction at an angle α, and an etching region P1 is formed on the ITO substrate, where 0 <a<90°。

[0010] Furthermore, when the surface of the top electrode layer is a circle composed of concentric rings, the circular module is divided into several concentric rings according to a distance r from the center, and an etching region P1 is formed on the ITO substrate along the outer circumference of each ring, where 0 <r<R。

[0011] Furthermore, multiple etched regions P1 are set on adjacent sides of the regular polygon module, with each segment equally dividing the side length, and the series sequence is arranged clockwise from the outside to the inside.

[0012] Beneficial Effects: Compared with existing technologies, this invention has the following advantages: High fill factor (GFF>95%): By segmenting into triangular, sector-shaped, and other units, the etched area is reduced (total width of P1-P3 ≤ 0.3mm). Process tolerance: The x / y offset between regions P2 and P3 is allowed to have an error of 0.1mm, reducing manufacturing difficulty. Compatibility with irregularly shaped substrates: Supports non-rectangular module designs such as circles and polygons, expanding application scenarios. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the square module of this utility model;

[0014] Figure 2 This is a schematic diagram of the square modules P1, P2, and P3 of this utility model;

[0015] Figure 3 This is a schematic diagram of the regular hexagonal module of this utility model;

[0016] Figure 4 This is a schematic diagram of the regular hexagonal module P1, P2, and P3 of this utility model;

[0017] Figure 5 This is a schematic diagram of the concentric ring module of this utility model;

[0018] Figure 6 This is a schematic diagram of the concentric ring module P1, P2, and P3 of this utility model.

[0019] Figure 7 This is a schematic diagram of the fan-shaped module of this utility model;

[0020] Figure 8 This is a schematic diagram of the fan-shaped modules P1, P2, and P3 of this utility model. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0022] like Figure 1-2 As shown, this embodiment of the invention provides a square module consisting of four rectangular units. The base unit is a square ITO conductive glass substrate (side length 14.3cm), with four rectangular sub-units (4-1 to 4-4) formed by laser etching along two diagonals, with an etching line width of 0.025mm (P1). Each sub-unit surface is sequentially covered with an anode interface layer (PEDOT:PSS), an active layer (PM6:BPT-eC9), and a cathode interface layer (PDINN). A 0.07mm uncovered area is reserved at the connection point between adjacent sub-units in the active layer (P2, see...). Figure 1 (Yellow dashed line). The top silver electrode is deposited through a mask, forming a 0.04mm wide gap (P3) 0.04mm outside the P2 region, allowing adjacent sub-units to be connected in series via the "ITO-PEDOT:PSS-active layer-PDINN-Ag" path (direction of red arrow). The etching line layout is as follows: P1+P2+P3, with a total width of 0.135mm, reduced by a single diagonal line (only 2 etching lines connect 4 sub-units). The sub-units are connected in a clockwise direction, with the electrode gap (P3) located outside the area not covered by the active layer to avoid short circuits.

[0023] like Figure 3-4 As shown, this embodiment of the invention provides a regular hexagonal module consisting of six triangular units. A regular hexagonal ITO substrate (8.2cm side length) is laser-etched along its six diagonals into six equilateral triangular sub-units, with an etching line width of 0.025mm (P1). Each triangular sub-unit is covered with a functional layer, and a 0.07mm uncovered area is reserved at the connection point between adjacent sub-units (P2). Silver electrodes are circumferentially vapor-deposited along the outer edge of the hexagon, with the electrode gap (P3) located 0.04mm outside the P2 area, forming a clockwise series path from the outside in. The triangular sub-units, through a centrally symmetrical layout, reduce the total etching line length by 32% (compared to a square module). The circumferential electrode design reduces series resistance, making it suitable for curved surface mounting scenarios.

[0024] like Figure 5-6As shown, this embodiment of the invention provides a circular module—a concentric ring unit. A circular ITO substrate (16.16 cm in diameter) is divided into six ring sub-units by five concentric ring etching lines (2 cm apart), with a line width of 0.025 mm (P1). A 0.07 mm uncovered area (P2) is reserved between adjacent rings in the active layer. Silver electrodes are deposited sequentially from the outermost ring inwards, with an electrode gap (P3) width of 0.04 mm. Series paths extend radially, forming a radial current collection network. The concentric ring design can be matched to circular building surfaces (such as domes and solar streetlights). The radial etching lines avoid localized current accumulation, improving efficiency under low-light conditions.

[0025] like Figure 7-8 As shown, this embodiment of the invention provides a circular module – a fan-shaped unit. A circular ITO substrate (16.16 cm in diameter) is divided into four fan-shaped sub-units by two etched lines (2 cm apart), with a line width of 0.025 mm (P1). Each fan-shaped sub-unit is covered with a functional layer, and a 0.07 mm uncovered area (P2) is reserved at the connection point of adjacent sub-units. Silver electrodes are circumferentially vapor-deposited along the outer edge of the hexagon, with the electrode gap (P3) located 0.04 mm outside the P2 area, forming a clockwise series path from the outside in. The fan-shaped design reduces series resistance, making it particularly suitable for circular semi-transparent devices such as watches.

[0026] Table 1. Comparison of Geometric Fill Factor (GFF) values ​​for the same total area and process.

[0027] ;

[0028] As shown in Table 1: In a prior art example, on a square ITO substrate, 37 etching passes from left to right are performed to divide the substrate into 38 rectangular units, with a gap of P1 between each etching pass; then, functional layers are fabricated and etched sequentially, with a gap of P2 between each etching pass; finally, silver electrodes are deposited, with each gap being P3, resulting in a total of 37 (P1+P2+P3) dead zones. Based on this scheme, the more units formed on a single module, the higher the GFF (Gross Filter Effect).

Claims

1. A novel large-area organic solar cell module, characterized in that, It includes several sub-cells connected in series. Each sub-cell consists of a bottom electrode layer, a hole transport layer, an active layer, an electron transport layer and a top electrode layer from bottom to top. The surface shape of the top electrode layer is a square composed of several rectangular units, a regular polygon composed of several triangular units, a circle composed of several sector units, or a circle composed of several concentric rings.

2. The novel large-area organic solar cell module according to claim 1, characterized in that, The bottom electrode layer is made of indium tin oxide (ITO) glass.

3. A novel large-area organic solar cell module according to claim 1, characterized in that, When the surface of the top electrode layer is a square composed of rectangular units, the square is divided into four smaller rectangular units with perpendicular bisectors on adjacent sides. An etching region P1 is formed on the ITO substrate along the perpendicular bisectors. An etching region P2 is located at a distance x in front of P1 of the three adjacent units. P2 removes only the active layer and the interface layer. An etching region P3 is located at a distance y in front of P2. P3 removes electrode B, the active layer, and the interface layer. Wherein, 0≤x<0.1mm, 0≤y<0.1mm.

4. A novel large-area organic solar cell module according to claim 3, characterized in that, The square is divided into four small triangular units along the diagonal direction, forming an etched region P1 on the ITO substrate along the diagonal direction.

5. A novel large-area organic solar cell module according to claim 4, characterized in that, When the surface of the top electrode layer is a regular polygon composed of triangular units, the regular polygon is divided into several small triangular units along the diagonal direction, and an etching region P1 is formed on the ITO substrate.

6. A novel large-area organic solar cell module according to claim 1, characterized in that, When the surface of the top electrode layer is a circle composed of fan-shaped units, the circular module is divided into several fan-shaped units along the radial direction at an angle α, and an etching region P1 is formed on the ITO substrate, where 0 <a<90°。 7. A novel large-area organic solar cell module according to claim 1, characterized in that, When the surface of the top electrode layer is a circle composed of concentric rings, the circular module is divided into several concentric rings according to a distance r from the center, and an etching region P1 is formed on the ITO substrate along the outer circumference of each ring, where 0 <r<R。 8. A novel large-area organic solar cell module according to claim 5, characterized in that, Multiple etched regions P1 are set on adjacent sides of the regular polygon module, with each segment equally dividing the side length, and the series sequence is arranged clockwise from the outside to the inside.

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