200903813 九、發明說明： 【發明所屬技術領域】 技術領域 本發明係有關於一種太陽電池之電極形成用糊，特別 5 是有關於一種電極之機械強度及與基材間之密接性優異， 同時可充分地達成太陽電池所要求之BSF(背面電場，Back surface field)效果，並抑制焙燒後基材之彎曲現象且提高太 陽電池之效率，同時特別適合於高溫/高速焙燒且量產性 優異之太陽電池之電極形成用糊及利用其之太陽電池之電 10 極形成方法。 背景技術 最近由於無公害、設備之簡便性、耐久性之提升等各 種理由，太陽電池急速地擴散、普及，因此，目前研究多 15種可提高太陽電池之效率且量產性優異之太陽電池之製造 方法。 習知石夕太陽電池之電極形成係將包含有導電性金屬粉 末、玻璃溶塊及有機載體之糊印刷於石夕基材上，並進行乾 燥及而形成電極，特別是石夕太揚電池之後面電極通常 20係使用3/zm至i0/zm之鋁粉末。 堤係由低溫焙燒(5〇〇°C至75〇°C)及高溫焙燒(8 C至95〇c)所構成，且逐漸地重視生|費用之節省與量 I·生同時可藉由尚溫於短時間内進行錄燒之高溫培 要性更加地抬頭。 200903813 。 '之電極形成的後面糊在 藉由向溫（800 C至950°C)於短時間向 下門日自B ^ N進行焙燒時卻具有以 下問喊，即.機械強度及與基材 .Λ - Α , ^ 密接性降低，且於焙 燒後產生基材之彎曲現象，並於步 乂战溥電極層時降低BSF。 C發明内容3 發明之揭示 發明所欲解決之課題 為了解決前述習知技術問題，本發明之目的係提供一 10 Γ極之機械強度及與基材間之密接性優異，同時於形成 相極層日轉可充分地達成太陽電池所要求之BSF效果，並 抑制培燒後基材之彎曲現象且提高太陽電池之效率，同時 特別適合於高溫/高速賠燒且量產性優異之太陽電池之電 2形成用糊，及顧其之太陽電池之電極形成方法與藉由 前述方法所製造之太陽電池之電極。 15解決課題之手段 為了達成前述目的，本發明係提供一種太陽電池之電 極形成用糊，該太陽電池之電極形成用糊包含有：a)鼓緊 岔度（Tap density)至少1.28g/cc以上之鋁粉末6〇重量份至 75重量份；b)玻璃熔塊(giass frit)1重量份至5重量份；及幻 20有機載體20重量份至38重量份。 較為理想的是本發明太陽電池之電極形成用糊之前述 在呂粉末的敲緊密度宜為l_30g/cc至3.50g/cc。 又’本發明係提供一種太陽電池之電極形成方法，該 太陽電池之電極形成方法係將前述太陽電池之電極形成用 200903813 糊印刷於基材上並進行乾燥及焙燒者。 較為理想的是前述焙燒宜以850°C至950°C進行5秒鐘 至1分鐘。 又，本發明係提供一種以前述方法所製造之太陽電池 5 之電極。 發明之效果 依據本發明之太陽電池之電極形成用糊及太陽電池之 電極形成方法係電極之機械強度及與基材間之密接性優 異，同時於形成薄電極層時亦可充分地達成太陽電池所要 10 求之BSF效果，並抑制焙燒後基材之彎曲現象且提高太陽電 池之效率，同時特別適合於高溫/高速焙燒且量產性優異。 【實施方式3 發明之較佳實施形態 以下詳細說明本發明。 15 本發明包含有：a)敲緊密度至少1.28g/cc以上之鋁粉 末60重量份至75重量份；b)玻璃熔塊1重量份至5重量份； 及c)有機載體20重量份至38重量份。 於本發明中，敲緊密度(填充密度)係利用粉末試驗器將 鋁粉末填充於1 〇〇cc(cm3)體積之量瓶並實施敲緊2000次而 20 除去量瓶後，將試料正確地填充成100cc並測定粉末質量（g) 而將粉末質量（g)除以100之值。 前述a)鋁粉末之敲緊密度小於1.28g/cc時，無法充分 地達成BSF效果，且無法抑制焙燒後基材之彎曲現象，又， 在藉由高溫（800°C至950°C )於短時間内進行焙燒時會有燒 7 200903813 結性降低且太陽電池之效率降低之問題。 較為理想的是在本發明太陽電池之電極形成用糊中， 前述鋁粉末之敲緊密度宜為1.30g/cc至3.5〇g/cc，且更為 理想的是宜為1.30g/cc至2.0g/cc，於前述範圍内時，可 5提升填充因子(Fill Factor ’曲線因子）值並進一步地使太陽 電池之效率良好。 前述敲緊密度至少為1.28g/cc以上之鋁粉末可混合： Ο平均粒度為1 .〇 #爪至2.8 # m之球狀鋁粉末4〇重量份至75 重量份；及ii)平均粒度為3.0/zm至7.〇em之球狀鋁粉末25 10重量份至60重量份來加以製造，且較為理想的是宜混合： Ο平均粒度為1.5 v m至2.7 y m之球狀鋁粉末5〇重量份至70 重量份，及11)平均粒度為4.〇#m至6.0；/m之球狀鋁粉末30 重里伤至50重量份，此時，於高溫/高速培燒下燒結性優 異，且可進一步地提升太陽電池之填充因子值並提高太陽 15 電池之效率。 前述銘粉末宜於本發明之太陽電池之電極形成用糊中 含有60重量份至75重量份，且較為理想的是含有“重量份 至70重量份，於前述範圍内時，可於高溫/高速焙燒下提 升燒結性及太陽電池之填充因子值。 20 又，本發明之太陽電池之電極形成用糊包含有…玻璃 熔塊，前述玻璃熔塊可使用一般被使用在太陽電池之電極 糊的玻璃熔塊，舉例言之，可使用軟化點為4〇〇它至6⑼。^ 之硼矽酸(Boro Silicate)鉛玻璃、矽酸鉛玻璃、鉍系破璃戈 鋰系玻璃等。粒徑宜使用為至10/zm者，且較為理想 200903813 的是使用Bi203 - ZnO - Si02 - B2〇3、Al2〇3系玻璃炼塊，此 時，即使形成15㈣至25"m之薄電極，亦可防止基材之彎 曲現象。 又，前述玻璃炫塊宜於本發明太陽電池之電極形成用 5糊中含有1重量份至5重量份，且更為理想的是15重量％至3 重量％，於前述範圍内時，會具有可輕易地構成接著力、 燒結性及太陽電池之後加工程序之優點。 又，本發明之太陽電池之電極形成用糊包含有〇有機 載體，前述有機載體會透過與太陽電池之電極形成用糊的 10無機成分機械混合而賦與糊適合於印刷之黏稠度 (―)及流動學特性。前述有機載體可使用一般被使 用在太陽電池之電極糊的有機載體，例如可為聚合物與溶 劑之混合物。前述聚合物可使用丙烯酸醋系樹脂、乙基纖 維素、石肖化纖維素、乙基纖維素與苯盼樹脂之聚合物、木 15松脂(r〇Sin)或乙醇之聚甲基丙烯酸酯等，且較為理想的是宜 為硝化纖維素。又，前述溶劑可使用：丁卡必醇醋酸酯、 丁卡必醇、丙二醇單曱醚、二伸丙二醇單甲醚、丙二醇單 甲醚丙酸酯、乙醚丙酸酯、萜品醇(terpine〇1)、丙二醇單甲 醚醋酸酯、二甲胺甲醛、甲基乙基酮、T(gamma)T内酯或 20乳酸乙酯等，且可單獨或混合2種以上，又，較為理想的是 宜使用丁卡必醇醋酸酯。 於本發明中’前述載體宜於本發明太陽電池之電極形 成用糊中含有20重量％至28重量％，且聚合物與溶劑宜使用 以1一 10 : 10— 1之重量比混合者。 200903813 又，本發明之太陽電池之電極形成用糊更可依需要具 有-般包含於糊中的添加劑，前述添加劑之例子可列舉 如.燒結助劑、增黏劑、安定劑、分散劑或界面活性劑等， 且宜於本發明太陽電池之電極形成用糊中在(U重量份至 5 10重量份之範圍内使用。 本發明之太陽電池之電極形成用糊可依據預定比率摻 合前述所揭示之必要成分與任意成分，且藉由摻合機或三 軸滚筒等混練機將其均勻地分散，較為理想的是本發明之 太陽電池之電極形成用糊宜為在藉由使用布氏 10 (Brookfield)HBT黏度系統及# 51紡錘之多用途緯管於5rpm 及25°C下進行測定時具有50PaS至200PaS之黏度者。 又，本發明係提供一種太陽電池之電極形成方法及藉 由前述方法所製造之太陽電池之電極，且前述太陽電池之 電極形成方法係將前述太陽電池之電極形成用糊印刷於基 15材上並進行乾燥及焙燒者。於本發明之太陽電池之電極形 成方法中，除了使用前述太陽電池之電極形成用糊以外， 基材、印刷、乾燥及焙燒當然可使用〜般被使用在太陽電 池之製造的方法，舉例言之，前述基材可為印刷有前面電 極(Ag電極）且業經乾燥之Si基板，又，於本發明中，前述電 20極可為矽太陽電池之後面電極，前述印刷可為網板印刷， 前述乾燥可藉由90乞至250°(：來進行，前述焙燒可以⑼❻它 至950°C來進行，較為理想的是前述焙堍宜作成以800。(：至 950°C，且更為理想的是以85〇t至900¾進行5秒鐘至丨分鐘 之高溫/高速焙燒，又，前述印刷宜藉由加“爪至仙以瓜之 200903813 - 厚度來進行印刷。具體例係可於韓國專利公開公報第1〇一 6-〇1〇855〇號、第 1〇一2〇〇6 —〇127813號日本專利公 開公報特開2001 — 2〇2822及特開2〇〇3 — 133567所揭示之太 陽電池之結構及其製造中，使用本發明之前述太陽電池之 5 電極形成用糊來形成太陽電池之電極。 本發明之太陽電池之電極形成方法係電極之機械強度 &與基㈣之密接性《，同時於形成薄電極層時亦可= 分地達成太陽電池所要求之BSF效果，並抑㈣燒後基材之 彎曲現象且提高太陽電池之效率，同時特別適合於高溫/ 10 高速焙燒且量產性優異。 ^ 以下提示用以理解本發明之較佳實施例，然而，下述 實施例只不過是例示本發明，本發明之範圍並不限於下述 實施例。 〔實施例〕 15實施例1 • 冑平均粒徑為2御m之球狀㈣末66.7重量份與平 均粒徑為5·鄭m之球狀銘粉末33·3重量份均勾地混合，、並 製造敲緊密度為U5g/ee之太陽電池之電極形成用銘粉 末。藉由三滚筒混練機，使前述敲緊密度為U5g八c之銘 2〇粉末67·5重量份、粒徑為3.36/zm且軟化點為46代之低溶 點玻璃熔塊3.0重量份、藉由72 : 72 ·· 131之重量比混合有 乙基纖維素㈣MU轉素及了切醇醋酸_之有誠體 27.7重量份、增黏紙5重量份、界面活性細$重量份混合 分散，並製造太陽電池之電極形成用糊。 11 200903813 實施例2 於前述實施例1中，除了使用混合平均粒徑為2_68/zm 之球狀鋁粉末50重量份與平均粒徑為5.28 // m之球狀鋁粉 末50重量份且敲緊密度為1.43g/cc之鋁粉末以外，藉由與 5 前述實施例1相同之方法製造太陽電池之電極形成用糊。 實施例3 於前述實施例1中，除了使用混合平均粒徑為2.68/zm 之球狀鋁粉末74.6重量份與平均粒徑為5.28 // m之球狀鋁 粉末25.4重量份且敲緊密度為1.29g/cc之鋁粉末以外，藉 10 由與前述實施例1相同之方法製造太陽電池之電極形成用 糊。 實施例4 於前述實施例1中，除了藉由131 : 144之重量比混合丁 卡必醇醋酸酯與硝化纖維素來使用有機載體以外，藉由與 15 前述實施例1相同之方法製造太陽電池之電極形成用糊。 實施例5 於前述實施例2中，除了將丁卡必醇醋酸酯與硝化纖維 素混合成131 : 144之重量比來使用有機載體以外，藉由與 前述實施例2相同之方法製造太陽電池之電極形成用糊。 20 比較例1 於前述實施例1中，除了使用平均粒徑為5.28/zm且敲 緊密度為1.24§/〇:之球狀鋁粉末67.5重量份以外，藉由與 前述實施例1相同之方法製造太陽電池之電極形成用糊。 比較例2 12 200903813 於前述實施例1中’除了使用平均粒徑為2.68#m且敲 緊密度為1.19§/〇；之球狀鋁粉末67.5重量份以外，藉由與 前述實施例1相同之方法製造太陽電池之電極形成用糊。 利用藉由前述實施例1至實施例5及比較例1至比較例2 5 所製造之太陽電池之電極形成用糊，測定電極之表面狀 態、低彎曲度(l〇w bow)(mm)、Isc(A)、Voc(mV)、填充因子 (Fill Factor)及太陽電池之效率，並顯示於下述表1。 實驗方法係如下述。 藉由網板印刷技法，將利用前述實施例1至實施例5及 10 比較例1至比較例2所製造之糊全面印刷於晶圓（Wafer)之後 面’並使用熱風式乾燥爐於150°C下使其乾燥6分鐘，然後， 於晶圓之前面將銀(Ag)糊(paste)進行圖案印刷後，藉由相同 之方法乾燥。將前述過程中所形成之晶胞(Cell)，使用帶型 焙燒爐於500°C至900°C間進行焙燒20秒至30秒鐘，且依此 15 完成製造之晶胞係使用太陽電池之效率測定裝備（印地 (EndeasI)公司，魁克桑（Quicksun)120A)來觀察低彎曲度 (mm)、Isc(A)、Voc(mV)、填充因子、效率（％)性能。又， 晶胞表面之斑點或粗度係藉由肉眼來觀察，且於未觀察出 表面之斑點時顯示為“良好”，於具有斑點時顯示為 20 “有”，於表面具有粗部時顯示為“粗”，於表面未具有 粗部時顯示為“良好”。 13 200903813 〔表1〕 表面 斑點 表面 粗度 low bow (mm) Isc (A) Voc (mV) 填充因 子 效率 (%) 實施例1 良好 良好 <1 5.16 610.3 0.78 16.42 實施例2 良好 良好 <1 5.19 611.5 0.76 16.20 實施例3 良好 良好 <1 5.16 610.2 0.75 16.02 實施例4 良好 良好 <1 5.17 610.8 0.78 16.50 實施例5 良好 良好 <1 5.19 611.6 0.77 16.65 比較例1 有 良好 <1 5.13 607.1 0.71 15.24 比較例2 良好 粗 <1 5.11 607.6 0.73 15.72 如前述表1所示，相較於使用一般被使用在習知太陽電 池之敲緊密度小於1 · 2 5 g / c c之鋁粉末的比較例1及比較例 2，於本發明之實施例1至實施例5時幾乎未產生電極之表面 5 斑點、表面粗度且良好，同時Isc(A)、Voc(mV)、填充因子 及太陽電池之效率皆顯著地顯示優異之結果，特別是可確 認在使用硝化纖維素時(實施例4至實施例5)是更為有效的。 【圖式簡單說明；1 (無） 10 【主要元件符號說明】 (無） 14BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste for forming an electrode for a solar cell, and particularly relates to an excellent electrical strength of an electrode and adhesion to a substrate, and Fully achieve the BSF (Back Surface Field) effect required by solar cells, and suppress the bending phenomenon of the substrate after baking and improve the efficiency of the solar cell, and is particularly suitable for high temperature/high speed baking and excellent mass production of the sun. A method for forming an electrode for forming an electrode of a battery and an electric electrode for using a solar cell using the same. BACKGROUND OF THE INVENTION Recently, solar cells have rapidly spread and spread due to various reasons such as pollution-free, equipment simplicity, and durability improvement. Therefore, there are currently 15 types of solar cells that can improve the efficiency of solar cells and have excellent mass productivity. Production method. The electrode forming system of the Shishi solar cell prints a paste containing a conductive metal powder, a glass soluble block and an organic carrier on a stone substrate, and dries and forms an electrode, especially after the Shi Xi Tai Yang battery. The surface electrode is usually 20-series aluminum powder of 3/zm to i0/zm. The levee is composed of low-temperature roasting (5 ° ° C to 75 ° C) and high-temperature roasting (8 C to 95 〇 c), and gradually pays attention to the cost of saving and the amount of energy. The high-temperature cultivation of recording and burning in a short period of time is more frequent. 200903813. The back paste formed by the 'electrode has the following call when it is baked from B ^ N in a short time to the temperature (800 C to 950 ° C), ie mechanical strength and with the substrate. - Α , ^ The adhesion is lowered, and the bending of the substrate occurs after firing, and the BSF is lowered when the electrode layer is struck. C DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION In order to solve the above-mentioned problems of the prior art, the object of the present invention is to provide a mechanical strength of 10 turns and excellent adhesion to a substrate while forming a phase layer. The daily rotation can fully achieve the BSF effect required by the solar cell, and suppress the bending phenomenon of the substrate after the burning and improve the efficiency of the solar cell, and is particularly suitable for the high-temperature/high-speed burning and the mass production of the solar cell. 2 forming a paste, and an electrode forming method of the solar cell of the same, and an electrode of a solar cell manufactured by the above method. In order to achieve the above object, the present invention provides a paste for forming an electrode for a solar cell, wherein the paste for forming an electrode of the solar cell comprises: a) a tap density of at least 1.28 g/cc or more. The aluminum powder is 6 parts by weight to 75 parts by weight; b) the glass frit is 1 part by weight to 5 parts by weight; and the phantom 20 organic carrier is 20 parts by weight to 38 parts by weight. It is preferable that the electrode for forming an electrode of the solar cell of the present invention has a knocking degree of from 1 to 30 g/cc to 3.50 g/cc. Further, the present invention provides a method for forming an electrode for a solar cell, which is characterized in that the electrode for forming the solar cell is printed on a substrate with a paste of 200903813 and dried and baked. It is preferred that the calcination is carried out at 850 ° C to 950 ° C for 5 seconds to 1 minute. Further, the present invention provides an electrode of the solar cell 5 manufactured by the aforementioned method. Advantageous Effects of Invention According to the electrode forming paste for a solar cell of the present invention and the electrode forming method of the solar cell, the mechanical strength of the electrode and the adhesion to the substrate are excellent, and the solar cell can be sufficiently obtained when the thin electrode layer is formed. It is required to obtain the BSF effect, suppress the bending phenomenon of the substrate after baking, and improve the efficiency of the solar cell, and is particularly suitable for high-temperature/high-speed baking and excellent mass productivity. [Embodiment 3] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. 15 The present invention comprises: a) 60 parts by weight to 75 parts by weight of aluminum powder having a knock-tightness of at least 1.28 g/cc or more; b) 1 part by weight to 5 parts by weight of the glass frit; and c) 20 parts by weight of the organic vehicle 38 parts by weight. In the present invention, the knocking density (filling density) is obtained by filling the aluminum powder in a measuring flask of 1 〇〇 cc (cm 3 ) volume with a powder tester and performing a tightening 2000 times. 20 After removing the measuring bottle, the sample is correctly The powder was filled to 100 cc and the powder mass (g) was measured and the powder mass (g) was divided by a value of 100. When the knocking degree of the a) aluminum powder is less than 1.28 g/cc, the BSF effect cannot be sufficiently achieved, and the bending phenomenon of the substrate after baking cannot be suppressed, and at a high temperature (800 ° C to 950 ° C) When baking is performed in a short period of time, there is a problem that the burning property is lowered, and the efficiency of the solar cell is lowered. Preferably, in the paste for electrode formation of the solar cell of the present invention, the knocking degree of the aluminum powder is preferably from 1.30 g/cc to 3.5 〇g/cc, and more preferably from 1.30 g/cc to 2.0. g/cc, when within the above range, can increase the Fill Factor 'curve factor' value and further improve the efficiency of the solar cell. The aluminum powder having a knocking degree of at least 1.28 g/cc or more may be mixed: an average particle size of Ο# 〇# claw to 2.8 #m of spherical aluminum powder 4 parts by weight to 75 parts by weight; and ii) an average particle size of 3.0 to zm to 7. 〇em of spherical aluminum powder 25 is produced in an amount of 10 parts by weight to 60 parts by weight, and desirably is preferably mixed: 球 spherical aluminum powder having an average particle size of 1.5 vm to 2.7 ym. To the weight of 70 parts by weight, and 11) the spherical aluminum powder having an average particle size of 4. 〇#m to 6.0; /m is 30 parts by weight to 50 parts by weight, and at this time, the sinterability is excellent under high temperature/high speed sinter, and It can further increase the fill factor value of the solar cell and increase the efficiency of the solar 15 battery. The above-mentioned powder is preferably contained in the paste for electrode formation of the solar cell of the present invention in an amount of from 60 parts by weight to 75 parts by weight, and more preferably from "parts by weight to 70 parts by weight", in the above range, at a high temperature/high speed In addition, the paste for electrode formation of the solar cell of the present invention includes a glass frit, and the glass frit can be a glass which is generally used for an electrode paste of a solar cell. For the frit, for example, a softening point of 4 〇〇 to 6 (9) can be used. Boro Silicate lead glass, lead citrate glass, lanthanum glass, etc. For the case of 10/zm, and more preferably 200903813, Bi203 - ZnO - Si02 - B2〇3, Al2〇3 series glass refining block is used. In this case, even if a thin electrode of 15 (four) to 25 " m is formed, the base can be prevented. Further, the glass block is preferably contained in an amount of from 1 part by weight to 5 parts by weight, and more preferably from 15% by weight to 3% by weight, based on the 5 paste for electrode formation of the solar cell of the invention, in the foregoing range Inside, it will be light Further, the electrode forming paste for a solar cell of the present invention contains a ruthenium organic carrier, and the organic carrier transmits a paste which is formed with a paste for forming an electrode of a solar cell. The components are mechanically mixed to impart a viscosity (") and flow characteristics to the paste. The organic vehicle may be an organic vehicle generally used in an electrode paste of a solar cell, for example, a mixture of a polymer and a solvent. As the polymer, acrylic acid vinegar resin, ethyl cellulose, stone xiaohua cellulose, polymer of ethyl cellulose and benzene resin, wood 15 rosin (r〇Sin) or polymethacrylate of ethanol, etc., may be used. Preferably, it is preferably nitrocellulose. Further, the above solvent can be used: tetracaine alcohol acetate, tetracarbitol, propylene glycol monoterpene ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether propionate, Ethyl ether propionate, terpineol (terpine〇1), propylene glycol monomethyl ether acetate, dimethylamine formaldehyde, methyl ethyl ketone, T (gamma) T lactone or 20 ethyl lactate, etc. In the present invention, the above-mentioned carrier is preferably contained in the paste for electrode formation of the solar cell of the present invention in an amount of 20% by weight to 28% by weight, and more preferably The polymer and the solvent are preferably used in a weight ratio of 1 to 10: 10 - 1. 200903813 Further, the electrode for forming an electrode of the solar cell of the present invention may further contain an additive generally contained in the paste as needed, and the aforementioned additive Examples thereof include a sintering aid, a tackifier, a stabilizer, a dispersing agent, a surfactant, and the like, and are preferably in the electrode forming paste of the solar cell of the present invention (in the range of U by weight to 5 10 parts by weight) It is preferable to use the paste for electrode formation of the solar cell of the present invention by blending the above-mentioned essential components and optional components according to a predetermined ratio, and uniformly dispersing them by a blender such as a blender or a triaxial roller. It is preferable that the paste for electrode formation of the solar cell of the present invention has 50 PaS to be measured at 5 rpm and 25 ° C by using a Brookfield HBT viscosity system and a # 51 spindle multipurpose weft tube. The viscosity of 200PaS. Moreover, the present invention provides a method for forming an electrode of a solar cell and an electrode for a solar cell manufactured by the above method, and the method for forming an electrode of the solar cell is to print a paste for forming an electrode of the solar cell on a substrate 15 And dry and calcined. In the electrode forming method of the solar cell of the present invention, in addition to the use of the paste for electrode formation of the solar cell, the substrate, printing, drying, and baking may of course be used in a method of manufacturing a solar cell, for example, The substrate may be a dried Si substrate printed with a front electrode (Ag electrode). Further, in the present invention, the electric 20 electrode may be a back surface electrode of the solar cell, and the printing may be screen printing. Drying can be carried out by 90 Torr to 250 ° (the above calcination, and the calcination can be carried out by (9) 至 to 950 ° C, and it is preferred that the above-mentioned roasting is preferably made at 800. (: to 950 ° C, and more preferably It is a high-temperature/high-speed baking of 85 〇t to 9003⁄4 for 5 seconds to 丨 minutes. Further, the printing is preferably carried out by adding "paw to sacred melon 200903813 - thickness. The specific example can be disclosed in Korean Patent. Japanese Unexamined Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The structure of the battery and its manufacture The electrode for forming a solar cell of the solar cell of the present invention is used to form an electrode of a solar cell. The electrode forming method of the solar cell of the present invention is a mechanical strength of the electrode & adhesion to the base (4), and simultaneously forming a thin electrode layer At the same time, it can also achieve the BSF effect required by the solar cell, and (4) the bending phenomenon of the substrate after burning and improve the efficiency of the solar cell, and is particularly suitable for high temperature/10 high-speed baking and excellent mass productivity. The following examples are merely illustrative of the invention, and the scope of the invention is not limited to the following examples. [Examples] 15 Example 1 • The average particle size of the crucible is 2 m spherical (4) at the end of 66.7 parts by weight and the average particle size of 5 · Zheng m globular powder 33. 3 parts by weight are mixed, and the electrode of the solar cell with a knocking degree of U5g / ee Formed with Ming powder. By the three-roller kneading machine, the above-mentioned knocking tightness is U5g 八c 铭2〇 powder 67·5 parts by weight, the particle size is 3.36/zm and the softening point is 46 generations of low melting point glass melting. Block 3.0 parts by weight, by 72: 72 · · 131 weight ratio mixed with ethyl cellulose (four) MU transferrin and cut alcohol acetic acid _ of the honest body 27.7 parts by weight, 5 parts by weight of sticky paper, interface activity fine weight parts mixed dispersion, and the production of solar cells Paste for electrode formation. 11 200903813 Example 2 In the foregoing Example 1, except that 50 parts by weight of spherical aluminum powder having a mixed average particle diameter of 2 to 68/zm and spherical aluminum powder having an average particle diameter of 5.28 // m were used. An electrode forming paste for a solar cell was produced by the same method as in Example 1 above except that 50 parts by weight of aluminum powder having a knocking degree of 1.43 g/cc was used. Example 3 In the foregoing Example 1, except that 74.6 parts by weight of spherical aluminum powder having a mixed average particle diameter of 2.68 / zm and 25.4 parts by weight of spherical aluminum powder having an average particle diameter of 5.28 / m were used, and the knocking degree was A paste for forming an electrode for a solar cell was produced by the same method as in Example 1 except that 1.29 g/cc of aluminum powder was used. Example 4 In the foregoing Example 1, a solar cell was produced by the same method as in the above-mentioned Example 1, except that the organic vehicle was used by mixing tetrabutyl ketone acetate and nitrocellulose by a weight ratio of 131:144. A paste for electrode formation. Example 5 In the foregoing Example 2, a solar cell was produced by the same method as the above Example 2, except that the mixture of tetracarbitol acetate and nitrocellulose was used to form a weight ratio of 131:144 to the organic carrier. A paste for electrode formation. 20 Comparative Example 1 In the foregoing Example 1, except that a spherical aluminum powder having an average particle diameter of 5.28 / zm and a knocking degree of 1.24 § / 〇: 67.5 parts by weight was used, the same method as in the above Example 1 was used. A paste for forming an electrode for a solar cell is produced. Comparative Example 2 12 200903813 In the foregoing Example 1, 'the same as the foregoing Example 1 except that the spherical aluminum powder having an average particle diameter of 2.68 #m and a knock-tightness of 1.19 §/〇; 67.5 parts by weight was used. Method A paste for electrode formation of a solar cell is produced. The electrode formation paste of the solar cell manufactured by the above-described first to fifth embodiments and the comparative example 1 to the comparative example 25 was used to measure the surface state of the electrode, the low bending degree (mm), and the low bending degree (mm). Isc (A), Voc (mV), fill factor (Fill Factor) and solar cell efficiency are shown in Table 1 below. The experimental method is as follows. By using the screen printing technique, the pastes produced by the above-mentioned Embodiments 1 to 5 and Comparative Examples 1 to 2 were printed on the wafer (wafer) and used in a hot air drying oven at 150°. It was dried for 6 minutes at C, and then silver (Ag) paste was patterned on the front side of the wafer, and then dried by the same method. The cell formed in the foregoing process is calcined at 500 ° C to 900 ° C for 20 seconds to 30 seconds using a belt type baking furnace, and the cell unit manufactured according to this 15 is used for a solar cell. Efficiency measurement equipment (Endeas I, Quicksun 120A) was used to observe low bend (mm), Isc (A), Voc (mV), fill factor, efficiency (%) performance. Further, the spot or the thickness of the surface of the unit cell is observed by the naked eye, and is displayed as "good" when no spot on the surface is observed, 20 "having" when there is a spot, and displayed when the surface has a thick portion. It is "thick" and shows "good" when the surface does not have a thick part. 13 200903813 [Table 1] Surface spot surface roughness low bow (mm) Isc (A) Voc (mV) Fill factor efficiency (%) Example 1 Good good <1 5.16 610.3 0.78 16.42 Example 2 Good good <1 5.19 611.5 0.76 16.20 Example 3 Good Good <1 5.16 610.2 0.75 16.02 Example 4 Good Good <1 5.17 610.8 0.78 16.50 Example 5 Good Good <1 5.19 611.6 0.77 16.65 Comparative Example 1 Good <1 5.13 607.1 0.71 15.24 Comparative Example 2 Good Rough <1 5.11 607.6 0.73 15.72 As shown in Table 1 above, compared to the use of aluminum powders which are generally used in conventional solar cells with a knock-tightness of less than 1 · 25 g / cc In Example 1 and Comparative Example 2, at the surface of Example 1 to Example 5 of the present invention, the surface of the electrode 5 was hardly generated, the surface roughness was good, and Isc (A), Voc (mV), filling factor, and solar cell were hardly produced. The efficiency was remarkably showing excellent results, and in particular, it was confirmed that the use of nitrocellulose (Examples 4 to 5) was more effective. [Simple description of the diagram; 1 (none) 10 [Description of main component symbols] (none) 14