JP2013077804A - 拡散剤組成物、不純物拡散層の形成方法および太陽電池 - Google Patents
拡散剤組成物、不純物拡散層の形成方法および太陽電池 Download PDFInfo
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- JP2013077804A JP2013077804A JP2012155806A JP2012155806A JP2013077804A JP 2013077804 A JP2013077804 A JP 2013077804A JP 2012155806 A JP2012155806 A JP 2012155806A JP 2012155806 A JP2012155806 A JP 2012155806A JP 2013077804 A JP2013077804 A JP 2013077804A
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Abstract
【解決手段】半導体基板への不純物拡散剤層の形成に用いられる拡散剤組成物は、ホウ酸エステル(A)と、下記一般式(1)で表される多価アルコール(B)と、アルコキシシラン化合物(C)と、を含有する。
[一般式(1)中、kは0〜3の整数。mは1以上の整数。R2およびR3は、それぞれ独立に、水素原子、水酸基、炭素原子数1〜5のアルキル基、または炭素原子数1〜5のヒドロキシアルキル基。R2およびR3が複数の場合は複数のR2およびR3はそれぞれ同じでも異なってもよい。またkが2以上である場合、複数のR2およびR3は必ず一つ以上の水酸基または炭素原子数1〜5のヒドロキシアルキル基を含む。R4およびR5は、それぞれ独立に水素原子または炭素原子数1〜3のアルキル基。]
【選択図】なし
Description
ホウ酸エステル(A)は、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。ホウ酸エステル(A)は、III族(13族)元素の化合物であり、P型の不純物拡散成分であるホウ素を含有する。ホウ酸エステル(A)は、半導体基板内に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。より具体的には、ホウ酸エステル(A)は、N型の半導体基板内にP型の不純物拡散層を形成することができ、P型の半導体基板内にP+型(高濃度P型)の不純物拡散層を形成することができる。
[一般式(2)中、R1はそれぞれ独立に、炭素原子数1〜10のアルキル基、または炭素原子数6〜10のアリール基である。3つのR1は同じでも異なってもよい。]
多価アルコール(B)は、下記一般式(1)で表される。
アルコキシシラン化合物(C)は、下記一般式(3)で表されるアルコキシシランを加水分解して得られる反応生成物を含む。
R6 nSi(OR7)4−n (3)
[一般式(3)中、R6は水素原子または有機基である。R7は有機基である。nは0、1、または2の整数である。R6が複数の場合は複数のR6は同じでも異なってもよく、(OR7)が複数の場合は複数の(OR7)は同じでも異なってもよい。]
[一般式(4)中、R21、R22、R23およびR24は、それぞれ独立に上記R7と同じ有機基を表す。a、b、cおよび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。]
[一般式(5)中、R31は、上記R6と同じ水素原子または有機基を表す。R32、R33およびR34は、それぞれ独立に上記R7と同じ有機基を表す。e、f、および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。]
[一般式(6)中、R41およびR42は、上記R6と同じ水素原子または有機基を表す。R43およびR44は、それぞれ独立に上記R7と同じ有機基を表す。hおよび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。]
[一般式(7)中、R13は、置換基を有していてもよい炭化水素基であり、Xはスルホン酸基である。]
本実施の形態に係る拡散剤組成物は、任意成分として有機溶剤(D)を含有する。有機溶剤(D)は、多価アルコール(B)以外の有機溶剤である。有機溶剤(D)としては、例えば、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、プロピレングリコール、グリセリン、ジプロピレングリコール等の多価アルコール、ジプロピ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、ジプロピレングリコールモノメ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。
本実施の形態に係る拡散剤組成物は、上述した各成分を従来公知の方法により、任意の順番で、均一な溶液となるよう混合することにより調製することができる。
図1(A)〜図2(D)を参照して、N型の半導体基板にP型の不純物拡散層を形成する方法と、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る太陽電池の製造方法について説明する。図1(A)〜図1(D)、および図2(A)〜図2(D)は、実施の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。
評価試験Iで使用した拡散剤組成物の各成分および含有量を表1に示す。なお、以下の実施例および比較例では、界面活性剤として、シリコーン系界面活性剤(SF8421EG:東レ・ダウコーニング株式会社製)を使用した。また、実施例1〜7,9および比較例1〜5では、有機溶剤(D)として、ジプロピレングリコールモノメチルエーテル(MFDG)を使用し、その含有量は、拡散剤組成物の全質量を100wt%としたときに、各成分の含有量を100wt%から差し引いた残部の量が全て溶剤の含有量となっている。実施例8では、有機溶剤(D)として、プロピレングリコールモノメチルエーテル(PGME)およびMFDGを使用した。PGMEの含有量は、表1に示す通りである。MFDGの含有量は、拡散剤組成物の全質量を100wt%としたときに、PGMEを含む各成分の含有量を100wt%から差し引いた残部の量となっている。
TEB:ホウ酸トリエチル(トリエチルボレート)
TMB:ホウ酸トリメチル(トリメチルボレート)
MPT:3−メチルペンタン−1,3,5−トリオール
TMP:トリメチロールプロパン
EG:エチレングリコール
PG:プロピレングリコール
1,3−BD:1,3−ブタンジオール
1,4−BD:1,4−ブタンジオール
MFDG:ジプロピレングリコールモノメチルエーテル
PGME:プロピレングリコールモノメチルエーテル
PPG:ポリプロピレングリコール
上述した拡散剤組成物の調製方法にしたがって調製した実施例1〜9および比較例1〜5の拡散剤組成物を、コーター(SS8261NUU:東京応化工業株式会社製)を用いてサンプル基板上に塗布した。次に、サンプルをホットプレート上に載置して、150℃で3分間プリベーク処理を施した。以上の工程により、実施例1〜7および比較例1〜5については厚さ300nm、実施例8,9については厚さ500nmの不純物拡散剤層を得た。
各実施例および各比較例の不純物拡散剤層について、顕微鏡観察にてホウ酸エステル(A)の凝集の有無を確認し、凝集抑制性(被膜性)を評価した。凝集が確認されない場合を良好(○)とし、凝集が確認された場合を不適当(×)とした。結果を表1に示す。
図3を参照しながら、評価試験IIについて説明する。図3(A)および図3(B)は、アウトディフュージョン抑制性の評価試験における熱拡散工程を説明するための模式図である。
実施例1〜3および比較例2,6の拡散剤組成物を、コーター(SS8261NUU:東京応化工業株式会社製)を用いてN型半導体基板に塗布した。次に、サンプル基板をホットプレート上に載置して、実施例1〜3および比較例2は200℃で0.5分間、比較例6は150℃で3分間、プリベーク処理を施した。以上の工程により、実施例1〜3および比較例2は厚さ800nm、比較例6は厚さ400nmの不純物拡散剤層を得た。
実施例1〜3および比較例2,6について、半導体基板1(塗布基板)のシート抵抗値と、ダミー基板11のシート抵抗値を、シート抵抗測定器(VR−70:国際電気株式会社製)を用いて四探針法により測定した。半導体基板1およびダミー基板11のそれぞれについて、25点のシート抵抗値を測定して平均値を算出した。また、抵抗値比(半導体基板1のシート抵抗値に対するダミー基板11のシート抵抗値の大きさ)を算出した。結果を表2に示す。
Claims (9)
- 半導体基板への不純物拡散剤層の形成に用いられる拡散剤組成物であって、
ホウ酸エステル(A)と、
下記一般式(1)で表される多価アルコール(B)と、
アルコキシシラン化合物(C)と、
を含有することを特徴とする拡散剤組成物。
- 前記ホウ酸エステル(A)は、下記一般式(2)で表される請求項1に記載の拡散剤組成物。
B(OR1)3 (2)
[一般式(2)中、R1はそれぞれ独立に、炭素原子数1〜10のアルキル基、または炭素原子数6〜10のアリール基である。3つのR1は同じでも異なってもよい。] - 前記ホウ酸エステル(A)の含有量は、前記多価アルコール(B)の含有量の5倍モル以下である請求項1または2に記載の拡散剤組成物。
- 実質的に水を含まない請求項1乃至3のいずれか1項に記載の拡散剤組成物。
- 前記アルコキシシラン化合物(C)は、下記一般式(3)で表されるアルコキシシランを加水分解して得られる反応生成物を含む請求項1乃至4のいずれか1項に記載の拡散剤組成物。
R6 nSi(OR7)4−n (3)
[一般式(3)中、R6は水素原子または有機基である。R7は有機基である。nは0、1、または2の整数である。R6が複数の場合は複数のR6は同じでも異なってもよく、(OR7)が複数の場合は複数の(OR7)は同じでも異なってもよい。] - 前記多価アルコール(B)以外の有機溶剤(D)を含有する請求項1乃至5のいずれか1項に記載の拡散剤組成物。
- 選択的な塗布による所定パターンの不純物拡散剤層の形成に用いられる請求項1乃至6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7のいずれか1項に記載の拡散剤組成物を選択的に塗布して所定パターンの不純物拡散剤層を形成するパターン形成工程と、
前記拡散剤組成物に含まれるホウ酸エステル(A)のホウ素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。 - 請求項8に記載の不純物拡散層の形成方法により不純物拡散層が形成された半導体基板を備えることを特徴とする太陽電池。
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JP2020021766A (ja) * | 2018-07-30 | 2020-02-06 | グローバルウェーハズ・ジャパン株式会社 | シリコンウェーハの製造方法 |
JP7051633B2 (ja) | 2018-07-30 | 2022-04-11 | グローバルウェーハズ・ジャパン株式会社 | シリコンウェーハの製造方法 |
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TWI545626B (zh) | 2016-08-11 |
CN103688340B (zh) | 2016-07-20 |
TW201327638A (zh) | 2013-07-01 |
US20140227865A1 (en) | 2014-08-14 |
WO2013038613A1 (ja) | 2013-03-21 |
JP6022243B2 (ja) | 2016-11-09 |
US9048175B2 (en) | 2015-06-02 |
CN103688340A (zh) | 2014-03-26 |
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