M439318 五、新型說明： 【新型所屬之技術領域】 本創作係有關太陽能電池印刷網版，特別指一種可降 低漿料使用量之太陽能電池印刷網版。 【先前技術】 近年來，由於環境污染的問題越來越嚴重，很多國家 開始開發新的綠色能源來減少境污染的問題。太陽能電池 ® 可將太陽的光能轉為電能，且這種轉換不會產生任何污染 性的物質，因此太陽能電池的相關應用逐漸受到重視。 太陽能電池是利用半導體的光電效應直接吸收太陽光 來發電，其發電原理是當太陽光照射在太陽能電池上時， 太陽能電池會吸收太陽光能，而使太陽能電池之P型半導 體與N型半導體分別產生電洞與電子，並使電子與電洞分 離來形成電壓降，進而產生電流。 請參閱圖1，太陽能電池10的結構製程，通常會利用 • 網版印刷的方式來於半導體基板11上形成複數條匯流電 極(bus bar)20，與匯流電極20相連接的複數個指狀電極 21(finger)。其中指狀電極21係用以收集因光電效應所產生 的電子或電洞，並將其傳送至匯流電極20，而匯流電極20 則主要用以將指狀電極21所傳送的電子或電洞傳送到外 部儲電裝置或外部應用裝置。一般而言，匯流電極20之寬 度大於指狀電極21寬度數十倍以上。 又，太陽能電池10的結構上複數條較細的指狀電極 21是需要漿料高度越高越好，用以獲取較高的太陽能轉換 率，而至少二條的匯流電極20只需要有一定的漿料即可用 3 M439318 以傳送電子或電洞到外部儲電裝置，並不需要很高的漿料 厚度。 但，現有網版印刷技術中，網版上網紗線徑皆為一樣 寬度的情況下，為了使該些指狀電極21區域的漿料高度能 更高，在同時印刷指狀電極21與匯流電極20時，將會使 該指狀電極21與匯流電極20區域的漿料厚度都會同時變 高。如此，形成匯流電極20的漿料厚度越高，使的漿料不 必要的耗用過多，造成成本更高。 φ 而且，為了能印刷出更高厚度漿料，就必須增加印刷 膜的厚度，而匯流電極之寬度大於指狀電極寬度數十倍以 上，傳統網版在匯流電極落料區的網紗上未設置支撐點， 刮印刀下壓的情況下因匯流電極落料區寬度較大而刮印刀 直接下壓接觸到被印物造成下墨不全，同時刮印刀下壓距 離變大，網紗變形量較大而易磨損。 【新型内容】 於是，為解決上述缺失，本創作之目的係在提供一種 ® 太陽能電池印刷網版，藉由不同區域之網紗線徑的大小， 使不同落料區的落料開口大小不同的結構，降低部份區域 漿料之厚度，達到節省漿料的功能，而線徑加大亦可增加 印刷網版的壽命。 本創作之另一目地係在提供一種太陽能電池印刷網 版，可在匯流電極落料區設置複數個支撐點，用以減少刮 .印刀在網紗上下壓的距離，可以改善下墨不全的問題；減 少匯流電極落料區網紗的變形量，可以增加印刷網版的壽 命0 4 M439318 為達上述之目的，本創作揭露一種太陽能電池印刷網 版，該印刷網版包括一網紗及一印刷膜，該印刷膜設置於 該網紗中，其中該印刷膜中設有印刷太陽能電池之匯流電 極的匯流電極落料區^及指狀電極的指狀電極落料區’其 特徵在於.該匯流電極落料區的網紗線徑大於該指狀電極 落料區的網紗線徑。 其中*該匯流電極落料區的網紗線控係依聚料、印刷 條件做為線徑加大的依據。 另外，可以於該匯流電極落料區的網紗設置複數個支 撐點，支撐點可設置亦可以不設置，而印刷膜的厚度做為 支撐點設置與否的依據。 本案的優點在於，透過部分落料區域的網紗線徑經處 理變大，該些落料區域的網紗則因線徑變大而開口變小， 印刷時漿料透墨率降低；藉此，網紗不同區域開口大小不 同的結構，降低部份區域漿料之厚度，達到節省漿料以降 低成本，而金屬網紗線徑變大時亦加強了匯流電極落料區 網紗的強度提高了印刷網版的壽命。 另一優點為，匯流電極落料區設置複數個支撐點，支 撐點可減小刮印刀下壓的距離，刮印刀不會直接碰觸到被 印物*可改善匯流電極洛料區下墨不全的情況。因此到印 刀下壓時網紗不會因下壓太深而可減小網紗變形量，提高 了印刷網版的壽命；複數個支撐點亦可減少匯流電極落料 區的透墨量，達到節省漿料的效果。 【實施方式】 茲舉出本創作太陽能電池印刷網版的附圖說明及具體 5 M439318 實施方式，以協助專利審查委員對本創作的技術特徵及内 容做瞭解，敬請參見如下的陳述： 請參閱圖2及圖3，為本案之印刷網版之示意圖及部 分放大圖。本案係一種印刷太陽能電池結構(如圖1所示之 太陽能電池10)之印刷網版1〇〇，該印刷網版10〇至少包括 一網框110 ’ 一網紗13〇，該網紗130固著於網框110上， 而〆印刷膜120設置於該網紗13〇上’其中該印刷膜12〇 由感光膜或金屬箔所形成，現有市場及專利已揭露相關的 結構技術’所以該印刷膜12〇的組成結構技術為已知技 術，且非本專利重點，在此不多加贅述。 該印刷膜120中設有印刷太陽能電池之匯流電極的匯 流電極落料區121 ’及指狀電極的指狀電極落料區122，其 特徵在於該匯流電極落料區121的網紗1211線徑大於該指 狀電極落料區122的網紗1221線程。 其中該匯流電極落料區121的網紗1211及該指狀電極 落料區122的網紗1221係由複數條金屬網線交錯編織而 成，實施上可透過塗佈、電鑄等方式處理加大該匯流電極 落料區121的網紗1211線徑，但不限定於電鑄或塗佈的方 式，且加大線徑的材料不限定為金屬材料或高分子材料。 該匯流電極落料區121的網紗1211線徑可依漿料、印刷條 件等因素’做為線徑加大的依據。 本案之印刷網版100操作時，係於外框110範圍内置 入印刷材料後，透過印刷膜120經過匯流電極落料區Π1 及指狀電極落料區122之後到達欲印刷之基板（圖中無顯 示）’由於匯流電極落料區121與指狀電極落料區122之寬 度不同，所以在至少二條的匯流電極落料區121的網紗 6 M439318 1211線徑加大，此區域網紗1211間的開口變小，而降低 此區域的漿料透墨率。刮印刀將網紗上的漿料經刮印而透 過印刷膜120，形成至少二條的匯流電極區域比複數條指 狀電極區域内漿料透墨率較小，漿料厚度較低。 又，該匯流電極落料區121的網紗1211因為線徑加 大，網紗1211間的開口變小，而降低該處之漿料透墨率， 這些漿料減少的部分就是節省的成本。且至少二條的匯流 電極區域寬度較大，該匯流電極落料區121的網紗1211經 φ 印刷後較易形變而磨損，在將該匯流電極落料區121的網 紗1211線徑加大後，將可使該匯流電極落料區121的強度 增加，印刷網版100壽命會更長，另外穩定性更好，印刷 精度也會提高。 請再參閱圖4及圖5，本案實施上，可於該匯流電極 落料區121的網紗1211進一步設置複數個支撐點1212, 該支撐點1212可以由高分子感光乳劑或電鑄方式填滿網 紗1211間的網眼所形成，其形狀可為方形（如圖4所示）、 圓形（如圖5所示）等各種形狀。支撐點可設置亦可以不設 • 置，而印刷膜的厚度做為支撐點設置與否的依據。 透過該匯流電極落料區121的複數個支撐點1212，可 縮短該匯流電極落料區121受刮印下壓的距離，刮印刀不 會直接碰觸到被印物，可改善匯流電極落料區下墨不全的 情況；同時減少此匯流電極落料區網紗1211變形量，提高 了印刷網版100的壽命；複數個支撐點1212亦可減少該匯 流電極落料區121的透墨量，達到節省漿料的效果。 本創作在上文中已以較佳實施例揭露，然熟習本項技 術者應理解的是，該實施例僅用於描繪本創作，而不應解 7 M439318 讀為限制本創作之範圍。應注意的是，舉凡與該實施例等 效之變化與置換，均應設為涵蓋於本創作之範疇内。因此， 本創作之保護範圍當以下文之申請專利範圍所界定者為 準。 【圖式簡單說明】 圖1為太陽能電池之示意圖。 圖2為本案之印刷網版之示意圖。 φ 圖3為本案之印刷網版之部分放大示意圖。 圖4為本案之印刷網版之支撐點示意圖一。 圖5為本案之印刷網版之支撐點示意圖二。 【主要元件符號說明】 10 :太陽能電池 11 :半導體基板 20 .匯流電極 21 :指狀電極 _ 100 :印刷網版 110 :網框 120 :印刷膜 121 .匯流電極洛料區 122 :指狀電極落料區 1211、1221 :網紗 1212 :支撐點 130 :網紗M439318 V. New description: [New technical field] This creation is about solar cell printing screen, especially a solar cell printing screen that can reduce the amount of pulp used. [Prior Art] In recent years, as the problem of environmental pollution has become more and more serious, many countries have begun to develop new green energy sources to reduce the problem of environmental pollution. Solar cells ® convert the sun's light energy into electrical energy, and this conversion does not produce any polluting substances, so the application of solar cells has received increasing attention. The solar cell uses the photoelectric effect of the semiconductor to directly absorb sunlight to generate electricity. The principle of power generation is that when the sunlight is irradiated on the solar cell, the solar cell absorbs the solar energy, and the P-type semiconductor and the N-type semiconductor of the solar cell respectively The holes and electrons are generated, and the electrons are separated from the holes to form a voltage drop, which in turn generates a current. Referring to FIG. 1 , a structural process of the solar cell 10 is generally formed by using a screen printing method to form a plurality of bus bars 20 on the semiconductor substrate 11 and a plurality of finger electrodes connected to the bus electrodes 20 . 21 (finger). The finger electrode 21 is used to collect electrons and holes generated by the photoelectric effect and is transmitted to the bus electrode 20, and the bus electrode 20 is mainly used for transmitting the electrons or holes transmitted by the finger electrode 21. To an external storage device or an external application device. In general, the width of the bus electrode 20 is more than ten times larger than the width of the finger electrode 21. Moreover, the plurality of thinner finger electrodes 21 on the structure of the solar cell 10 are required to have a higher slurry height for obtaining a higher solar energy conversion rate, and at least two bus electrodes 20 need only have a certain slurry. It is possible to use 3 M439318 to transfer electrons or holes to an external storage device without the need for a high slurry thickness. However, in the conventional screen printing technology, in the case where the screen yarn diameters of the screen are all the same width, in order to make the height of the slurry of the finger electrodes 21 region higher, the finger electrodes 21 and the bus electrodes are simultaneously printed. At 20 o'clock, the thickness of the slurry in the region of the finger electrode 21 and the bus electrode 20 will be simultaneously increased. Thus, the higher the thickness of the slurry forming the bus electrode 20, the more unnecessary the slurry is consumed, resulting in higher cost. φ Moreover, in order to be able to print a higher thickness paste, it is necessary to increase the thickness of the printed film, and the width of the bus electrode is more than ten times the width of the finger electrode, and the conventional screen is not on the mesh of the blanking area of the bus electrode. Set the support point, when the squeegee is pressed down, the width of the blanking area of the bus electrode is large, and the squeegee directly presses down to contact the printed matter, causing the ink to be incomplete, and the pressing distance of the squeegee is increased, the mesh is increased. The deformation amount is large and it is easy to wear. [New content] Therefore, in order to solve the above-mentioned shortcomings, the purpose of this creation is to provide a ® solar cell printing screen, which has different blanking opening sizes in different blanking areas by the size of the mesh yarn diameters in different regions. The structure reduces the thickness of the slurry in a part of the area to achieve the function of saving the slurry, and the increase of the wire diameter can also increase the life of the printing screen. Another object of the present invention is to provide a solar cell printing screen which can be provided with a plurality of support points in the blanking area of the bus electrode to reduce the distance between the upper and lower pressing of the printing knife, which can improve the incompleteness of the ink. The problem is that the deformation of the mesh of the confluent electrode in the blanking area can be reduced, and the life of the printing screen can be increased. 4 4 M439318 To achieve the above purpose, the present invention discloses a solar cell printing screen which comprises a mesh and a mesh. a printing film, wherein the printing film is disposed in the mesh, wherein the printing film is provided with a confluent electrode blanking region for printing a confluent electrode of the solar cell and a finger electrode blanking region of the finger electrode. The mesh diameter of the blanking region of the bus electrode is larger than the mesh diameter of the blanking region of the finger electrode. Among them, the mesh yarn control in the blanking area of the bus electrode is based on the material and printing conditions as the basis for increasing the wire diameter. In addition, a plurality of support points may be disposed on the mesh of the confluent electrode blanking area, and the support points may or may not be disposed, and the thickness of the printed film is used as a basis for setting or not the support points. The advantage of the present invention is that the mesh yarn diameter through the partial blanking area is increased, and the mesh of the blanking area becomes smaller due to the larger diameter of the wire, and the ink permeability of the slurry is lowered during printing; The structure of different sizes of openings in different areas of the mesh reduces the thickness of the slurry in a part of the area to save the slurry to reduce the cost, and the strength of the mesh of the confluent electrode in the blanking area is enhanced when the diameter of the metal mesh becomes larger. The life of the printed screen. Another advantage is that a plurality of support points are arranged in the blanking area of the bus electrode, and the support point can reduce the distance of the pressing of the squeegee, and the squeegee does not directly touch the printed matter* can improve the underflow of the bus electrode. Incomplete ink. Therefore, when the printing knife is pressed down, the mesh is not too deep to reduce the deformation of the mesh, and the life of the printing screen is improved; the plurality of supporting points can also reduce the amount of ink passing through the blanking area of the collecting electrode. Achieve the effect of saving the slurry. [Embodiment] The description of the drawings of the solar cell printing screen and the specific 5 M439318 implementation are provided to assist the patent examination committee in understanding the technical features and contents of the creation. Please refer to the following statement: 2 and FIG. 3 are schematic diagrams and partial enlarged views of the printing screen of the present invention. The present invention relates to a printing screen 1 of a printed solar cell structure (such as the solar cell 10 shown in FIG. 1). The printing screen 10〇 includes at least one frame 110' a mesh 13〇, and the mesh 130 is solid. On the frame 110, the enamel printing film 120 is disposed on the mesh 13', wherein the printing film 12 is formed of a photosensitive film or a metal foil, and the related art is disclosed in the existing market and patents. The structure of the film 12 组成 is known in the art, and is not the focus of this patent, and will not be further described herein. The printing film 120 is provided with a bus electrode blanking area 121' for printing the bus electrode of the solar cell and a finger electrode blanking area 122 of the finger electrode, characterized in that the wire 1211 diameter of the bus electrode blanking area 121 The mesh 1221 thread is larger than the finger electrode blanking area 122. The mesh 1211 of the bus electrode blanking area 121 and the mesh 1221 of the finger electrode blanking area 122 are formed by interlacing a plurality of metal mesh wires, and can be processed by coating, electroforming, etc. The mesh 1211 diameter of the bus electrode blanking area 121 is large, but is not limited to the electroforming or coating method, and the material for increasing the wire diameter is not limited to a metal material or a polymer material. The wire diameter of the mesh 1211 of the bus electrode blanking area 121 can be used as a basis for increasing the wire diameter according to factors such as slurry and printing conditions. When the printing screen 100 of the present invention is operated, after the printing material is built in the outer frame 110, the printing film 120 passes through the bus electrode blanking area Π1 and the finger electrode blanking area 122 to reach the substrate to be printed (no in the figure). It is shown that 'the wire diameter of the mesh 6 M439318 1211 in at least two of the bus electrode blanking areas 121 is increased due to the difference in width between the bus electrode blanking area 121 and the finger electrode blanking area 122, and the area of the mesh 1211 is The opening becomes smaller, and the ink permeability of the slurry in this region is lowered. The squeegee squeegee the paste on the mesh through the printing film 120 to form at least two bus electrode regions having a smaller ink permeability and a lower slurry thickness than the plurality of finger electrodes. Further, since the mesh 1211 of the bus electrode blanking area 121 is enlarged, the opening between the meshes 1211 becomes small, and the ink permeability of the slurry at the place is lowered, and the reduced portion of the slurry is a cost saving. And at least two of the bus electrode regions have a large width, and the mesh 1211 of the bus electrode blanking area 121 is easily deformed and worn after being printed by φ, and the wire diameter of the mesh 1211 of the bus electrode blanking area 121 is increased. The strength of the bus electrode blanking area 121 will be increased, the life of the printing screen 100 will be longer, and the stability is better, and the printing precision is also improved. Referring to FIG. 4 and FIG. 5 again, in the implementation of the present invention, a plurality of support points 1212 may be further disposed on the mesh 1211 of the bus electrode blanking area 121, and the support point 1212 may be filled by a polymer emulsion or electroforming. The mesh is formed between the mesh yarns 1211, and the shape thereof may be various shapes such as a square shape (as shown in FIG. 4) and a circular shape (as shown in FIG. 5). The support points can be set or not, and the thickness of the printed film is used as the basis for setting the support points. Through the plurality of support points 1212 of the bus electrode blanking area 121, the distance of the confluent electrode blanking area 121 by the squeegee pressing can be shortened, and the squeegee does not directly touch the printed object, thereby improving the sinking electrode falling. In the case where the ink is incomplete in the material area; at the same time, the deformation amount of the mesh 1211 in the blanking area of the bus electrode is reduced, and the life of the printing screen 100 is improved; and the plurality of support points 1212 can also reduce the amount of ink passing through the blanking area 121 of the bus electrode. To achieve the effect of saving slurry. The present invention has been disclosed in the above preferred embodiments, and it should be understood by those skilled in the art that this embodiment is only used to depict the present invention, and is not intended to limit the scope of the present invention. It should be noted that variations and permutations that are equivalent to the embodiment are intended to be within the scope of the present invention. Therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application below. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a solar cell. Figure 2 is a schematic view of the printing screen of the present invention. φ Figure 3 is a partially enlarged schematic view of the printing screen of the present invention. Figure 4 is a schematic view of the support point of the printing screen of the present invention. Figure 5 is a schematic view of the support point of the printing screen of the present invention. [Description of main component symbols] 10: Solar cell 11 : Semiconductor substrate 20 . Bus electrode 21 : Finger electrode _ 100 : Printing screen 110 : Frame 120 : Printed film 121 . Bus electrode electrode material area 122 : Finger electrode falling Material area 1211, 1221: mesh 1212: support point 130: mesh