M442582 五、新型說明： 【新型所屬之技術領域】 一種印刷太陽能電池電極之網版，尤指一種二次印刷 生產太陽能電池電極結構的印刷網版。 【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。 請蒼閱圖1 ’太陽能電池的電極結構5通常會利用網 • 版印刷的方式來於半導體基板10上形成環形電極 (redundant) 11、複數條匯流電極（bus bar) 12及複數個指狀電 極13 (finger)，其中匯流電極12和指狀電極13是相互垂 直，且匯流電極12 —般為二條或三條線寬較寬的電極，指 狀電極13為數量較多一般為數十條線寬較細的電極。 又，指狀電極13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12，而匯流電極12則主 要用以將指狀電極13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12之寬度大 於指狀電極13寬度數十倍以上。 M442582 又，太陽能電池的電極結構上複數條的指狀電極13是 寬度越細越好而漿料高度必須越高越好，用以獲取較高的 太陽能轉換率，而至少二條的匯流電極12只需要有一定的 漿料即可用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，現有網版印刷技術為一次性印刷，為了使該些指 狀電極13之落料區域的漿料高度能更高，在同時印刷指狀 電極13與匯流電極12時，將會使該些指狀電極13與匯流 φ 電極12之落料區域的漿料厚度都會同時變高。如此，形成 匯流電極12的聚料厚度太南’使得聚料不必要的耗用過 多，造成材料成本過高。 另外，現有用一種二次網版印刷技術，係透過第一次 印刷指狀電極13底部，再第二次印刷指狀電極13頂部及 匯流電極12，但是，因為指狀電極13寬度越細越好，此 種次網版印刷技術在二次網版印刷時會產生二片網版對位 點及圖形位置的偏移誤差，在第二次疊印時會造成對位耗 時、印刷偏移、線條變粗、漿料不平整與漿料浪費等問題。 【新型内容】 有鑑於此，為解決上述之缺點，本創作之目的係在提 供一種印刷太陽能電池電極之網版，使匯流電極、環形電 極與指狀電極分別得到較好的電極寬度、厚度並達到較高 的均勻性與精準度，可達更好的電性與太陽能轉換率，而 節省更多漿料與網版壽命更長可以降低成本。 為達上述之目的，本創作一種印刷太陽能電池電極之 網版，其包括：一第一印刷網版表面設有複數條匯流電極 4M442582 V. New description: [New technical field] A screen for printing solar cell electrodes, especially a printing screen for secondary printing production of solar cell electrode structures. [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. Please refer to FIG. 1 'The electrode structure 5 of the solar cell generally forms a ring electrode 11 on the semiconductor substrate 10 by means of screen printing, a plurality of bus bars 12 and a plurality of finger electrodes. 13 (finger), wherein the bus electrode 12 and the finger electrode 13 are perpendicular to each other, and the bus electrode 12 is generally two or three electrodes having a wide line width, and the finger electrodes 13 are in a large number, generally several tens of lines are thin and thin. Electrode. Moreover, the finger electrodes 13 are used to collect electrons and holes generated by the photoelectric effect and are transmitted to the bus electrode 12, and the bus electrodes 12 are mainly used for the electrons or holes transmitted by the finger electrodes 13. Transfer to an external storage device or an external application device. In general, the width of the bus electrode 12 is more than ten times larger than the width of the finger electrode 13. M442582 In addition, the plurality of finger electrodes 13 on the electrode structure of the solar cell have a width as fine as possible, and the slurry height must be higher as possible to obtain a higher solar energy conversion rate, and at least two bus electrodes 12 only need to be A certain amount of slurry can be used to transfer electrons or holes to an external storage device without requiring a high slurry thickness. However, the existing screen printing technology is a one-time printing, in order to make the height of the slurry in the blanking area of the finger electrodes 13 higher, when the finger electrodes 13 and the bus electrodes 12 are simultaneously printed, the The thickness of the slurry of the blanking region of the finger electrode 13 and the confluent φ electrode 12 is simultaneously increased. Thus, the thickness of the aggregate forming the bus electrode 12 is too large, so that the aggregate is unnecessarily consumed excessively, resulting in an excessive material cost. In addition, a secondary screen printing technique is used to print the top of the finger electrode 13 and the bus electrode 12 a second time through the first printing of the bottom of the finger electrode 13, but because the width of the finger electrode 13 is as fine as possible. This kind of secondary screen printing technology will produce the offset error of the two screens of the alignment point and the graphic position in the secondary screen printing, which will cause the alignment time, printing offset and lines in the second overprinting. Thickening, uneven slurry and waste of slurry. [New content] In view of the above, in order to solve the above disadvantages, the purpose of the present invention is to provide a screen for printing solar cell electrodes, so that the bus electrode, the ring electrode and the finger electrode respectively obtain better electrode width and thickness. Achieve higher uniformity and precision, and achieve better electrical and solar conversion rates, while saving more slurry and screen life can reduce costs. In order to achieve the above purpose, a screen for printing a solar cell electrode includes: a plurality of bus electrodes 4 on a surface of a first printing screen;
)6Z 印刷網版表面設有巷池的匯流電極；以及—第二 的材料透過印刷由_=:=“=:電材質 太陽能電池的指狀電極。狀於4基板上構成 形成^ e卩刷網版包含—環形電極落料區，用以 /成太除此電池的環形電極。 用以 成分與第二印刷網:刷形成該些匯流電極的材料 相同或材料成分不同亥些指狀電極的材料成分可 與導電性了以为別搭配粒徑、黏度、穿透性 陽同特性的裝料來印刷，可達更好的電性與太 圖形二印刷網版為網紗網版上，其電極落料區 網版為二：：感光材料塗佈形成，該第-印刷網版為網紗 ，，周版2合成纖_或不__。 巧^ 版，印刷網版及該第二印刷網版為金屬箱網 其電極洛料區圖形由金屬羯形成。 套印本點在广，以二次印刷網版先後於不同位置 言， /的—次網版先後在相同位置疊印的精度更 :你必ΐ第二次印刷時花很長時間於複數條指狀電極上 斜力亡即省時間’也不會有網版對位不準造成上下層漿 ^丨一士^位而產生擴線的情況。本創作之金屬箔網版印 人曰狀電極的南度比習知之二次印刷指狀電極的厚度 戸與亚不；有錯位造成漿料塌陷或不平整的情況，而漿料 良費聚料’可節省成本。且在二條以上的匯流 。/、啜數條指狀電極的線寬與厚度皆差距很大的情況 M442582 下’可以分別搭配粒徑、勒声办 猫度 '穿透性與導電性耸 性的漿料來印刷，可達更好的雷卜 问特 逆又紆的電性與太陽能轉換率。 [實施方式】 故舉出本;IJ作印刷太陽能電池電極之網版的附圖說明 及具體實施方式，以協助專利審杳委The surface of the 6Z printing screen is provided with a bus electrode of the lane pool; and the second material is printed by the _=:===: finger electrode of the solar cell of the electric material. The shape is formed on the 4 substrate. The screen comprises a ring-shaped electrode blanking zone for forming a ring electrode of the battery. The component is the same as the second printing mesh: the material forming the bus electrodes is the same or the material composition is different. The material composition can be printed with the conductivity, which is matched with the loading of the particle size, viscosity and penetrability. The better the electrical and the graphic, the second printing screen is the mesh screen, the electrode The blanking area screen is two:: the photosensitive material is coated, the first printing net is mesh, the weekly version 2 synthetic fiber _ or not __. The printing version and the second printing network The version is a metal box net, and the pattern of the electrode Luo material area is formed by metal enamel. The printing point is wide, and the secondary printing screen is successively in different positions, and the /----the screen version has the precision of overprinting in the same position: You Must spend a long time on the second finger printing on a plurality of finger electrodes If you die, you will not have the situation that the screen is not allowed to cause the upper and lower layers of the pulp to be expanded. The metal foil screen of this creation has a southerly electrode than the conventional one. The thickness of the secondary printed finger electrode is 戸 and sub-abs; the misalignment causes the slurry to collapse or uneven, and the slurry is good for the material to save costs. And there are more than two confluences. The line width and thickness of the electrode are very different. The M442582 can be printed with the particle size, the sound of the dog's penetration and the conductivity of the slurry. The electrical and solar conversion rate of the reverse and the enthalpy. [Embodiment] This is a description of the drawings and the specific embodiment of the screen for printing the solar cell electrode to assist the Patent Review Committee.
請參2及圖3 ’為本創作印刷網版及太陽能電池 玉之示思ϋ。本創作—種印刷太陽能電池電極之網 版’印刷產生太陽能電池電極於一基板2〇〇上，先由— -印刷網版loo I面設有複數條匯流電極落料㊣ΐ5ι 含導電材質的材料透過印刷由該些匯流電極落料區ΐ5ι於 該基板2〇〇上構成太陽能電池的匯流電極wo;第一印刷 網版10G表面進-步可包含—環形電極落料區152，且由 該第印刷網版10〇印刷形成一環形電極220，該環形電 極220為非必要之電極，可依需求設置或不設置。 其中，該第一印刷網版1〇〇普通的網紗網版，其印刷 膜由高分子感光材料塗佈形成落料之圖形，該第一印刷網 版1〇〇之網紗為合成纖維網或不銹鋼絲網。例如，該第— 印刷網版1〇〇包括一網框ηο、一網紗12〇固著於網框ιι〇 上，該網紗120可為合成纖維網或不銹鋼絲網，或由—不 銹鋼絲網130設於該網紗12〇(合成纖維網）的開口處（如圖2 所示），然後於該網紗120(無不銹鋼絲網130時）或不銹鋼 絲網130由高分子感光材料塗佈形成一印刷膜14〇，以顯 影技術形成二條以上的匯流電極落料區151圖形與環形電 極落料區152圖形’漿料經刮印後透過印刷膜140上的圖 6 M442582 形於前述太陽能電池的基板200上形成匯流電極210與環 形電極220，並經烘乾固化。 請再參閱圖4及圖5，為本創作印刷網版及太陽能電 池電極之示意圖二。經過前述製程後，再由一第二印刷網 版300表面設有複數條指狀電極落料區350，使含導電材 質的材料透過印刷由該些指狀電極落料區350於前述基板 200上構成太陽能電池的指狀電極230，該些指狀電極230 間隔設置於該些匯流電極210的兩侧，且該些指狀電極230 φ 分別與匯流電極210電性連接。 其中，該第二印刷網版300為金屬箔網版，其印刷膜 由一金屬箔340形成指狀電極落料區350之圖形。例如， 該第二印刷網版300包括一網框310、一網紗320固著於 網框上，該網紗320可為合成纖維網，再由一金屬網330(不 銹鋼絲網或金屬平網）設於該網紗320網的開口處，然後於 該金屬網330上由該金屬箔340形成複數條指狀電極落料 區350圖形如圖4所示），漿料經刮印後透過金屬箔340上 的圖形於如述太1%能電池的基板200上形成指狀電極 • 230，並經烘乾固化。 其中，前述由感光膜或金屬箔形成印刷膜（電極落料區 圖形）’係現有市場及專利已揭露相關的結構技術’所以有 關印刷膜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。而，實施上，該第一印刷網版100結構 組合上可與及該第二印刷網版300同為金屬箔網版，由金 屬、治形成電極洛料區的圖形。 又，該第一印刷網版100印刷形成該些匯流電極210 的材料成分與第二印刷網版300印刷形成該些指狀電極 7 M442582 230的材料成分可相同或材料成分不同，在二條以上的匯 流電極210與複數條指狀電極230線寬與厚度皆差距很大 的情況下，可以分別搭配粒徑、黏度、穿透性與導電性等 不同特性的漿料來印刷，可達更好的電性與太陽能轉換率。 本創作透過第一次印刷的第一印刷網版1〇〇(普通的網 版）印刷出二條以上的匯流電極210，厚度不高但均勻一 致，相當利於後續導電片（圖中未示）的貼合，且漿料不會 太厚造成浪費；而第二次印刷的第二印刷網版300(金屬箔 φ 網版）印刷出線條很細、線條平整平直、厚度很高的指狀電 極，而線條細且直可增加電池片吸光面積，漿料厚實平整 可節省漿料亦較有效的導出電流，以提升太陽能轉換率。 且本創作一次印刷將匯流電極210與指狀電極2 3 0的分開 印刷，不會有網版上匯流電極與指狀電極圖形連接區域較 不而寸印刷的情況，相對的網版的使用壽命更長。 又，本創作以二次網版先後於不同位置套印，比習知 的二次網版先後在相同位置疊印的精度更高，不必在第二 次印刷時花很長時間於複數條指狀電極上對位，可節省時 ® 間，也不會有網版對位不準造成上下層漿料左右錯位，而 產生擴線的情況。且藉由金屬箔網版印刷一次指狀電極的 高度比習知之二次印刷指狀電極的厚度還高，不會有錯位 造成漿料塌陷或不平整的情況，而漿料厚實平直不浪費漿 料，可節省成本。 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 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， 8 M442582 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為太陽能電池電極之示意圖。 圖2為本創作網版之示意圖一。 圖3為本創作太陽能電池電極之示意圖一。 圖4為本創作網版之示意圖二。 ^ 圖5為本創作太陽能電池電極之示意圖二。 【主要元件符號說明】 (習知） 10 :半導體基板 11 :環形電極 12 ·匯流電極 13:指狀電極 (本創作） ® 100 :第-印刷網版 110 :網框 120 :網紗 130 :不銹鋼綵網 140 :印刷膜 151 .匯流電極洛料區 152 :環形電極落料區 200 :基板 210 :匯流電極 9 M442582 220 :環形電極 230 :指狀電極 300 :第二印刷網版 310 :網框 320 :網紗 330 :金屬網 340 :金屬箔 350 :指狀電極洛料區Please refer to 2 and Figure 3 for the creation of printing screens and solar cells. The creation of a screen for printing solar cell electrodes 'printing produces solar cell electrodes on a substrate 2 ,, first by - printing screen loo I surface is provided with a plurality of bus electrodes blanking material ΐ 5 ι containing conductive material Forming a bus electrode wo of the solar cell from the sinking region of the bus electrode by printing on the substrate 2; the first printing screen 10G surface advancement may include a ring electrode blanking region 152, and The printing screen 10 〇 prints to form a ring electrode 220, which is an unnecessary electrode, which may or may not be provided as needed. Wherein, the first printing screen plate 1 〇〇 ordinary gauze screen, the printing film is coated with a polymer photosensitive material to form a blanking pattern, and the first printing screen plate 1 mesh is a synthetic fiber mesh. Or stainless steel wire mesh. For example, the first printing screen 1 includes a frame ηο, and a mesh 12 is fixed on the mesh ι, which may be a synthetic fiber mesh or a stainless steel wire mesh, or a stainless steel wire. The net 130 is disposed at the opening of the mesh 12 (synthetic fiber web) (as shown in FIG. 2), and then coated with the polymer photosensitive material at the mesh 120 (when the stainless steel mesh 130 is absent) or the stainless steel mesh 130 The cloth forms a printing film 14〇, and two or more bus electrode blanking regions 151 are formed by a developing technique, and the annular electrode blanking region 152 is patterned. The slurry is smear-printed through the printing film 140. The bus electrode 210 and the ring electrode 220 are formed on the substrate 200 of the battery, and are cured by baking. Please refer to FIG. 4 and FIG. 5 again, which is a schematic diagram 2 of the creative printing screen and the solar battery electrode. After the foregoing process, a plurality of finger electrode blanking regions 350 are further disposed on the surface of a second printing screen 300, and the conductive material-containing material is transmitted through the finger electrode blanking regions 350 on the substrate 200. The finger electrodes 230 constituting the solar cells are disposed on the two sides of the bus electrodes 210, and the finger electrodes 230 φ are electrically connected to the bus electrodes 210, respectively. Wherein, the second printing screen 300 is a metal foil screen, and the printing film is formed by a metal foil 340 to form a pattern of the finger electrode blanking area 350. For example, the second printing screen 300 includes a frame 310 and a mesh 320 fixed to the frame. The mesh 320 can be a synthetic fiber mesh and then a metal mesh 330 (stainless steel mesh or metal flat mesh). ) is disposed at the opening of the mesh of the mesh 320, and then formed on the metal mesh 330 by the metal foil 340, a plurality of finger electrode blanking areas 350 are patterned as shown in FIG. 4, and the slurry is smear-printed and then transmitted through the metal. The pattern on foil 340 forms finger electrodes 230 on substrate 200 of a 1% energy battery as described above and is cured by drying. Wherein, the foregoing formation of a printing film (electrode blanking area pattern) by a photosensitive film or a metal foil is a related structural technique disclosed in the prior market and patents. Therefore, the structure and structure technology relating to the printing film is a known technique> The focus 'Do not add more details here. In practice, the first printing screen 100 can be combined with the second printing screen 300 as a metal foil screen, and the metal is formed into a pattern of the electrode material. Moreover, the material composition of the first printed screen 100 printed on the bus electrodes 210 and the material composition of the second printing screen 300 printed on the finger electrodes 7 M442582 230 may be the same or different in material composition, and two or more When the bus electrode 210 and the plurality of finger electrodes 230 have a large difference in line width and thickness, they can be printed with a slurry having different characteristics such as particle size, viscosity, permeability, and conductivity, respectively, to achieve better. Electrical and solar conversion rates. This creation prints two or more bus electrodes 210 through the first printed first printing screen 1 (common screen), the thickness is not high but uniform, which is quite conducive to the subsequent conductive sheets (not shown). Fit, and the slurry is not too thick to waste; and the second printed second printing screen 300 (metal foil φ screen) prints finger electrodes with very thin lines, flat lines, and high thickness. The thin and straight lines can increase the light absorption area of the battery sheet, and the thick and smooth slurry can save the slurry and effectively extract the current to improve the solar energy conversion rate. Moreover, the printing of the current electrode 210 and the finger electrode 230 are printed separately in one printing, and there is no case where the connecting surface of the bus electrode and the finger electrode pattern on the screen is relatively small, and the life of the screen is relatively long. Longer. In addition, the creation is overprinted in different positions in the second screen, which is more accurate than the conventional secondary screen in the same position, and it is not necessary to spend a long time on the plurality of finger electrodes in the second printing. The upper alignment can save the time between the ® and the screen alignment is not allowed to cause the upper and lower layers of the slurry to be misaligned to the left and right, resulting in the expansion of the line. Moreover, the height of the primary finger electrode by the metal foil screen printing is higher than the thickness of the conventional secondary printing finger electrode, and there is no misalignment to cause the slurry to collapse or uneven, and the slurry is thick and straight and not wasted. Slurry can save costs. The present invention has been disclosed in the above preferred embodiments, and it should be understood by those skilled in the art that the present invention is only intended to depict the present invention and should not be construed as limiting 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, 8 M442582 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 an electrode of a solar cell. Figure 2 is a schematic diagram 1 of the creation screen. FIG. 3 is a schematic view of the electrode of the solar cell of the present invention. Figure 4 is a schematic diagram 2 of the creation screen. ^ Figure 5 is a schematic diagram 2 of the solar cell electrode of the present invention. [Explanation of main component symbols] (Conventional) 10: Semiconductor substrate 11: Ring electrode 12 • Bus electrode 13: Finger electrode (this creation) ® 100: First printing net 110: Frame 120: Mesh 130: Stainless steel Color net 140: printing film 151. Bus electrode area 152: ring electrode blanking area 200: substrate 210: bus electrode 9 M442582 220: ring electrode 230: finger electrode 300: second printing screen 310: frame 320 : mesh yarn 330: metal mesh 340: metal foil 350: finger electrode Luo material area