JP5555469B2 - 拡散剤組成物、および不純物拡散層の形成方法 - Google Patents
拡散剤組成物、および不純物拡散層の形成方法 Download PDFInfo
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- JP5555469B2 JP5555469B2 JP2009231337A JP2009231337A JP5555469B2 JP 5555469 B2 JP5555469 B2 JP 5555469B2 JP 2009231337 A JP2009231337 A JP 2009231337A JP 2009231337 A JP2009231337 A JP 2009231337A JP 5555469 B2 JP5555469 B2 JP 5555469B2
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- HSDAZXVGQVMFAY-UHFFFAOYSA-N tributyl methyl silicate Chemical compound CCCCO[Si](OC)(OCCCC)OCCCC HSDAZXVGQVMFAY-UHFFFAOYSA-N 0.000 description 1
- PZOOLKGCOFWELU-UHFFFAOYSA-N tributyl propyl silicate Chemical compound CCCCO[Si](OCCC)(OCCCC)OCCCC PZOOLKGCOFWELU-UHFFFAOYSA-N 0.000 description 1
- NBXZNTLFQLUFES-UHFFFAOYSA-N triethoxy(propyl)silane Chemical compound CCC[Si](OCC)(OCC)OCC NBXZNTLFQLUFES-UHFFFAOYSA-N 0.000 description 1
- CXZMPNCYSOLUEK-UHFFFAOYSA-N triethyl propyl silicate Chemical compound CCCO[Si](OCC)(OCC)OCC CXZMPNCYSOLUEK-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- WKEXHTMMGBYMTA-UHFFFAOYSA-N trimethyl propyl silicate Chemical compound CCCO[Si](OC)(OC)OC WKEXHTMMGBYMTA-UHFFFAOYSA-N 0.000 description 1
- OMBAQAOBNOSBNU-UHFFFAOYSA-N tripentoxy(propyl)silane Chemical compound CCCCCO[Si](CCC)(OCCCCC)OCCCCC OMBAQAOBNOSBNU-UHFFFAOYSA-N 0.000 description 1
- AMUIJRKZTXWCEA-UHFFFAOYSA-N triphenoxy(propyl)silane Chemical compound C=1C=CC=CC=1O[Si](OC=1C=CC=CC=1)(CCC)OC1=CC=CC=C1 AMUIJRKZTXWCEA-UHFFFAOYSA-N 0.000 description 1
Images
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/06—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier
- H01L31/068—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar cells
- H01L31/0682—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PN homojunction type, e.g. bulk silicon PN homojunction solar cells or thin film polycrystalline silicon PN homojunction solar cells back-junction, i.e. rearside emitter, solar cells, e.g. interdigitated base-emitter regions back-junction cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/22—Diffusion of impurity materials, e.g. doping materials, electrode materials, into or out of a semiconductor body, or between semiconductor regions; Interactions between two or more impurities; Redistribution of impurities
- H01L21/2225—Diffusion sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic System
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/547—Monocrystalline silicon PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Description
加水分解生成物の出発材料となるアルコキシシラン(A−1)は下記式(1)で表されるSi含有化合物である。
(II)式中、R51、R52、R53及びR54は、それぞれ独立に上記R2と同じアルキル基又はフェニル基を表す。a、b、c及びdは、0≦a≦4、0≦b≦4、0≦c≦4、0≦d≦4であって、かつa+b+c+d=4の条件を満たす整数である。
(III)式中、R65は上記Rと同じ水素原子、アルキル基、又はフェニル基を表す。R66、R67、及びR68は、それぞれ独立に上記R2と同じアルキル基又はフェニル基を表す。e、f、及びgは、0≦e≦3、0≦f≦3、0≦g≦3であって、かつe+f+g=3の条件を満たす整数である。
(IV)式中、R70及びR71は上記R1と同じ水素原子、アルキル基、又はフェニル基を表す。ただし、R70及びR71のうちの少なくとも1つはアルキル基又はフェニル基を表す。R72、及びR73は、それぞれ独立に上記R2と同じアルキル基又はフェニル基を表す。h及びiは、0≦h≦2、0≦i≦2であって、かつh+i=2の条件を満たす整数である。
金属含有成分(B)は、アルコキシチタンの加水分解生成物(B−1)、アルコキシジルコニウムの加水分解生成物(B−2)、チタニア微粒子およびジルコニア微粒子のうち、少なくとも1種を含む。
(V)式中、R13は、置換基を有していてもよい炭化水素基、Xはスルホン酸基である。
不純物拡散成分(C)は、一般にドーパントとして太陽電池の製造に用いられる化合物である。不純物拡散成分(C)は、III族(13族)またはV族(15族)元素の化合物を含むN型またはP型の不純物拡散成分であり、太陽電池における電極を形成する工程において、半導体基板内にN型またはP型の不純物拡散層(不純物拡散領域)を形成することができる。不純物拡散成分(C)に含まれるV族元素の化合物としては、たとえば、P2O5、Bi2O3、Sb(OCH2CH3)3、SbCl3、As(OC4H9)3が挙げられる。不純物拡散成分(C)の濃度は、半導体基板に形成される不純物拡散層の層厚等に応じて適宜調整される。なお、III族の不純物拡散成分(C)としては、B2O3、Al2O3等が挙げられる。
有機溶剤(D)としては、たとえばメタノール、エタノール、イソプロパノール、ブタノールなどのアルコール類、アセトン、ジエチルケトン、メチルエチルケトンなどのケトン類、酢酸メチル、酢酸エチル、酢酸ブチルなどのエステル類、エチレングリコールジメチルエーテル、エチレングリコールジエチルエーテル、プロピレングリコールジメチルエーテル、プロピレングリコールジエチルエーテルなどのエーテル類、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテルなどのモノエーテル系グリコール類、テトラヒドロフラン、ジオキサンなどの環状エーテル類、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテートなどのエーテル系エステル類が挙げられる。
本発明の実施の形態に係る拡散剤組成物は、界面活性剤(以下、「(E)成分」ともいう。)をさらに含んでよい。(E)成分を含むことによって、塗布性、平坦化性、展開性を向上させることができ、塗布後に形成される拡散剤組成物層の塗りムラの発生を減少することができる。このような(E)成分として、従来公知のものを用いることができるが、シリコーン系の界面活性剤が好ましい。また、(E)成分は、拡散剤組成物全体に対し、500〜3000質量ppm、特に600〜2500質量ppmの範囲で含まれることが好ましい。さらに2000質量ppm以下であると、拡散処理後の拡散剤組成物層の剥離性に優れるため、より好ましい。(E)成分は単独で用いてもよく、組み合わせて用いてもよい。
図1を参照して、N型の半導体基板にインクジェット方式によりN型の不純物拡散成分(C)を含有する上述の拡散剤組成物を吐出してパターンを形成する工程と、拡散剤組成物中の不純物拡散成分(C)を半導体基板に拡散させる工程と、を含む不純物拡散層の形成方法と、これにより不純物拡散層が形成された半導体基板を備えた太陽電池の製造方法について説明する。図1(1A)〜(1E)は、実施形態に係る不純物拡散層の形成方法を含む太陽電池の製造方法を説明するための工程断面図である。
[実施例1−7]
実施例1−7は、金属含有成分(B)としてアルコキシチタンの加水分解生成物を含む拡散剤組成物である。実施例1−7の拡散剤組成物の作製方法を以下に示す。
(1)エタノール1440g、テトラエトキシシラン2565g、水445g、濃塩酸3.9mlを混合し、SiO2系被膜形成用塗布液(原液1)を作製した。
(2)エタノール486g、テトラプロポキシチタン185g、酢酸67g、アセチルアセトン131gを混合し、TiO2系被膜形成用塗布液(原液2)を作製した。
(3)SiO2換算固形分濃度とTiO2換算固形分濃度の和を7%、P2O5固形分濃度を5.4%、ジプロピレングリコール濃度を25.0%、溶剤をエタノールとし、SiO2換算:TiO2換算比を変えて表1に示す実施例1−7の各拡散剤組成物を調製した。
比較例の拡散剤組成物は、上述した原液1のみからなる。すなわち、比較例の拡散剤組成物では、表1に示すようにTiO2換算固形分濃度がゼロである。
実施例8−12は、金属含有成分(B)としてチタニア微粒子を含む拡散剤組成物である。実施例8−12の拡散剤組成物の作製方法を以下に示す。
(1)エタノール1440g、テトラエトキシシラン2565g、水445g、濃塩酸3.9mlを混合し、SiO2系被膜形成用塗布液(原液1)を作製した。
(2)SiO2換算固形分濃度とTiO2換算固形分濃度の和を7%、P2O5固形分濃度を5.4%、ジプロピレングリコール濃度を25.0%、溶剤をエタノールとし、SiO2換算:TiO2換算比を変えて表2に示す実施例8−12の各拡散剤組成物を調製した。
[弗酸耐性評価]
実施例、比較例の各拡散剤組成物について弗酸耐性の評価を実施した。弗酸耐性の評価の具体的な手法を以下に示す。
(1)ホットプレート上で80℃、150℃、200℃(各1分、合計3分)で行う低温ベーク後の膜厚を約3000Åに統一して評価するため、各拡散剤組成物をエタノール/ジプロピレングリコール=3/1のシンナーを用いて希釈した。
(2)温度23℃、湿度40%の条件下にて、上記(1)で調製した各拡散剤組成物をシリコン基板上にスピンコートし、ホットプレート上で80℃、150℃、200℃(各1分、合計3分)の低温ベーク処理を行った。低温ベーク後の膜厚を約3000Åに統一するため、スピン回転数を適宜変更してスピンコートした。
(3)上記(2)で作製した被膜を、750℃で30分間の低温キュア処理を施した。
(4)冷却後、被膜を0.1%弗酸に浸漬し、それぞれ0、3、5、10分後の膜厚をエリプソメーターを用いて測定した。溶解速度(Å/分)は浸漬0分後から10分後の膜べり量を10で割ることにより算出した。得られた結果を、表1および表2の「0.1%弗酸溶解速度」の欄に示す。
実施例、比較例の各拡散剤組成物について、その拡散性能の評価を実施した。なお、拡散性能は、シート抵抗値を測定することにより評価した。一般に、シート抵抗値が小さい程、拡散能力が高いとみなされる。シート抵抗値の評価の具体的な手法を以下に示す。なお、実施例3、5、7、および比較例については、膜厚約800、3000Åの2通りで評価した。また、実施例4、6については、膜厚約800Åで評価し、実施例1−2については膜厚約3000Åで評価した。
(1)低温ベーク後の膜厚を約800、3000Åに統一して評価するため、各拡散剤組成物をエタノール/ジプロピレングリコール=3/1のシンナーで希釈した。
(2)温度23℃、湿度40%の条件下にて、上記(1)で調製した各拡散剤組成物をシリコン基板上にスピンコートし、ホットプレート上で80℃、150℃、200℃(各1分、合計3分)の低温ベーク処理を行った。低温ベーク後の膜厚を約800、3000Åに統一するため、スピン回転数を適宜変更してスピンコートした。
(3)上記(2)で作製した被膜を、750℃で30分間の低温キュア処理を施した。
(4)冷却後、拡散(N2、950℃、30分)を行った。
(5)上記(4)の拡散処理を行ったシリコン基板を5%HF水溶液に10分間浸漬させて酸化膜のエッチング処理を施した後、シート抵抗値を測定した。得られた結果を、表1の「シート抵抗値」の欄に示す。
[弗酸耐性]
実施例7および実施例12のように、SiO2換算固形分量とTiO2換算固形分量の質量比(SiO2換算固形分量:TiO2換算固形分量)が98:2程度のチタン含有量でも比較例に比べて弗酸耐性が向上することが確認された。ただし、チタニア微粒子添加品の実施例12は、アルコキシチタンの加水分解生成物添加品の実施例7に比べて、その効果は小さかった。
ベーク後膜厚3000Åの場合には、SiO2換算固形分量とTiO2換算固形分量の質量比(SiO2換算固形分量:TiO2換算固形分量)が85:15〜98:2の範囲(実施例3、5、7)では、シート抵抗値は比較例と同程度ないしそれ以下の値となった。また、ベーク後膜厚800Åの場合には、SiO2換算固形分量:TiO2換算固形分量が95:5〜98:2(実施例5、6、7)の範囲では、比較例に比べてシート抵抗値が顕著に低下することが確認された。この傾向は、ベーク後膜厚3000Åの場合においても、実施例5、7で確認された。
Claims (7)
- 半導体基板への不純物拡散成分の印刷に用いられる拡散剤組成物であって、
アルコキシシランの加水分解生成物(A)と、
アルコキシチタンの加水分解生成物、アルコキシジルコニウムの加水分解生成物、チタニア微粒子およびジルコニア微粒子のうち、少なくとも1種を含む成分(B)と、
不純物拡散成分(C)と、
有機溶剤(D)と、
を含有することを特徴とする拡散剤組成物。 - 組成物全体に対するSiO2換算固形物の質量と組成物全体に対するTiO2換算固形物の質量との質量比(SiO2換算固形分量:TiO2換算固形分量)が85:15〜98:2の範囲である請求項1乃至3のいずれか1項に記載の拡散剤組成物。
- 前記不純物拡散成分(C)は、V族元素の化合物を含むことを特徴とする請求項1乃至5のいずれか1項に記載の拡散剤組成物。
- 半導体基板に、請求項1乃至6のいずれか1項に記載の拡散剤組成物を印刷してパターンを形成するパターン形成工程と、
前記拡散剤組成物の不純物拡散成分(C)を前記半導体基板に拡散させる拡散工程と、
を含むことを特徴とする不純物拡散層の形成方法。
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