JP5328363B2 - 太陽電池素子の製造方法および太陽電池素子 - Google Patents
太陽電池素子の製造方法および太陽電池素子 Download PDFInfo
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Description
まず初めに、本発明の実施の形態に係る製造方法を用いて製造された太陽電池素子20の構成を、図1及び図2を用いて説明する。太陽電池素子20は、受光面側に電極を有さず、裏面側に負電極および正電極を有するBC型太陽電池素子である。
本発明の実施の形態に係る太陽電池素子20の製造方法について、図4、図7、および図8を用いて工程ごとに詳細に説明する。図4は、太陽電池素子20の製造手順を概略的に示す図である。
まずp型の導電型を呈する半導体基板1を準備する(図4(a))。
次に、半導体基板1の一主面側に、逆導電型を呈する逆導電型層であるn型シリコン薄膜層3を形成する。具体的には、半導体基板1の裏面側(非受光面側)となる面上に、n型シリコン薄膜層3として、a−Si:H(n)膜あるいはμc−Si:H(n)膜を形成する。
次に、n型シリコン薄膜層3の上に、導電層7を形成する。特に、上述した透明導電接着層5と反射層6とを形成した上で、導電層7を形成するのがより好ましい(図4(c))。
次に、正極部16において半導体基板1と第二導電層7bとを導通接続させるために、正極部16の一部分にコンタクト部12を形成する。具体的には、導電層7全体のうち第二導電層7bとなる部分を加熱溶融させることによって、シリコン薄膜層、透明導電接着層5及び反射層6を貫通して、半導体基板1と第二導電層7bとを電気的に短絡させるコンタクト部12を形成する(図4(d))。
次に、図4(e)に示すように、負極部15と正極部16とを分離するための電極分離部11を形成する。
次に、図4(f)に示すように、半導体基板1の表面(受光面)側に、エッチング法によりテクスチャ構造1aを形成することが好ましい。
次に、絶縁層10を形成することが好ましい。絶縁層10は、図4(g)に示すように、導電層7及び電極分離部11に対して、第一電極13および第二電極14との導通を確保するための一部領域を除いた部位を覆うように形成される。
次に、図4(h)に示すように、第一電極13と第二電極14が形成されることが好ましい。この第一電極13及び第二電極14は、導電層7よりも半田濡れ性の高いものであることが好ましく、それによって後述する配線部材21と半田接続性を向上させることができる。但し、導電層7を既に金属ペーストを用いて形成している場合は、第一電極13及び第二電極14の形成を省略することも可能である。
次に、図4(i)に示すように、半導体基板1の受光面側にパッシベーション層8および反射防止層9を形成することが好ましい。
必要であれば、さらに、半田ディップ処理によって、第一電極13及び第二電極14上に半田領域を形成する態様であってもよい(不図示)。
単独の太陽電池素子の電気出力が小さい場合、複数の太陽電池素子を直列および並列に接続することで太陽電池モジュールが構成される。この太陽電池モジュールを複数個組み合わせることによって、実用的な電気出力の取り出しが可能となる。
尚、本発明は上述の実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において種々の変更、改良等が可能である。
Claims (13)
- 一導電型を呈する半導体基板の一主面側の少なくとも一部に、逆導電型を呈する逆導電型層を形成する逆導電型層形成工程と、
前記逆導電型層上に導電層を形成する導電層形成工程と、
前記導電層の少なくとも一部を加熱して溶融させることによって、該導電層と前記半導体基板とを導通接続するコンタクト部を形成する導通接続工程と、
前記導電層及び前記逆導電型層からなる積層体の一部をその厚み方向に除去して、該積層体を複数の部分積層体に分離する分離工程と、
を有することを特徴とする太陽電池素子の製造方法。 - 前記導通接続工程が、
前記複数の部分積層体の少なくとも一つを構成する導電層を加熱して溶融させることによって、該導電層と前記半導体基板とを導通接続する前記コンタクト部を形成する工程である、
ことを特徴とする請求項1に記載の太陽電池素子の製造方法。 - 前記分離工程は、レーザー光を前記積層体に照射することによって行われることを特徴とする請求項2に記載の太陽電池素子の製造方法。
- 前記逆導電型層形成工程においては、複数の前記逆導電型層が、前記半導体基板の一主面側に、互いに隔てて形成され、
前記導電層形成工程においては、前記複数の逆導電型層のそれぞれに導電層を形成することによって複数の導電層を形成し、
前記導通接続工程においては、前記複数の導電層の少なくとも一つを加熱して溶融させることによって、該導電層と前記半導体基板とを導通接続する前記コンタクト部を形成する、
ことを特徴とする請求項1に記載の太陽電池素子の製造方法。 - 前記導通接続工程においては、レーザー光を前記導電層に照射することによって該導電層を加熱して溶融させる、ことを特徴とする請求項1に記載の太陽電池素子の製造方法。
- 前記逆導電型層形成工程においては、前記半導体基板の一主面上に前記逆導電型層をCVD法により形成する、ことを特徴とする請求項1に記載の太陽電池素子の製造方法。
- 前記導電層形成工程においては、前記導電層をスパッタ法により形成する、ことを特徴とする請求項1に記載の太陽電池素子の製造方法。
- 前記半導体基板の前記一主面上にCVD法により真性型を呈する半導体層を形成した上で、前記逆導電型層形成工程によって前記逆導電型層を形成する、ことを特徴とする請求項1に記載の太陽電池素子の製造方法。
- 前記逆導電型層の上に透明導電接着層を形成した上で、前記導電層形成工程によって前記導電層を形成する、ことを特徴とする請求項1に記載の太陽電池素子の製造方法。
- 前記透明導電接着層の上にAgを主成分とする反射層を形成した上で、前記導電層形成工程によってAlを主成分とする前記導電層を形成する、ことを特徴とする請求項9に記載の太陽電池素子の製造方法。
- 前記半導体基板の前記一主面側の外表面であって前記導電層表面の一部を除いた領域に絶縁層を形成する絶縁層形成工程、
をさらに有することを特徴とする請求項1に記載の太陽電池素子の製造方法。 - 前記導通接続工程において前記半導体基板との間で導通接続されていない前記導電層の上に、該導電層よりも半田濡れ性が高い第一電極を形成する工程、
をさらに有することを特徴とする請求項1に記載の太陽電池素子の製造方法。 - 前記導通接続工程において前記半導体基板との間で前記導通接続がされた前記導電層の上に、該導電層よりも半田濡れ性が高い第二電極を形成する工程、
をさらに有することを特徴とする請求項1に記載の太陽電池素子の製造方法。
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CN111095571B (zh) * | 2017-10-04 | 2023-05-12 | 株式会社钟化 | 太阳能电池的制造方法、太阳能电池以及太阳能电池模块 |
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CN110993704A (zh) * | 2019-12-20 | 2020-04-10 | 浙江爱旭太阳能科技有限公司 | 用于制造太阳能电池的方法和太阳能电池 |
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US8455754B2 (en) | 2013-06-04 |
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