JP2020161643A - 太陽電池セルおよび太陽電池モジュール - Google Patents
太陽電池セルおよび太陽電池モジュール Download PDFInfo
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- JP2020161643A JP2020161643A JP2019059393A JP2019059393A JP2020161643A JP 2020161643 A JP2020161643 A JP 2020161643A JP 2019059393 A JP2019059393 A JP 2019059393A JP 2019059393 A JP2019059393 A JP 2019059393A JP 2020161643 A JP2020161643 A JP 2020161643A
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- conductive type
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- semiconductor substrate
- solar cell
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- H01L31/028—Inorganic materials including, apart from doping material or other impurities, only elements of Group IV of the Periodic System
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Abstract
Description
エネルギー源として期待されている。
[1.1 実施の形態1に係る太陽電池セルの構成]
実施の形態1に係る太陽電池セル10の概略構成について、図1〜図3を参照しながら説明する。図1は、実施の形態1に係る太陽電池セル10の構造を示す断面図である。図2は、実施の形態1に係る太陽電池セル10の構造を示す受光面側の平面図である。図3は、実施の形態1に係る半導体基板20の不純物濃度プロファイルを示す図である。図1は、図2のA−A´線に沿う断面図である。
実施の形態1に係る太陽電池セル10の製造方法について説明する。
[2.1 実施の形態2に係る太陽電池セルの構成]
図4は、実施の形態2に係る太陽電池セル10Aを示す断面図である。以下では、実施の形態1と同様の構成要素には同じ符号を用いて重複する説明を省略する。図4に示すとおり、本実施の形態に係る太陽電池セル10Aは、半導体基板20の第2主面22側のみに第1電極50および第2電極60を備える点で、半導体基板20の第1主面21および第2主面22のそれぞれに第1電極50および第2電極60を備える実施の形態1に係る太陽電池セル10と異なる。
[3.1 変形例1に係る太陽電池セルの構成]
本変形例では、実施の形態1に係る太陽電池セル10と同様の積層構造を有する太陽電池セルにおいて、半導体基板20が図5に示す第1導電型の不純物濃度プロファイルを有する場合の例について説明する。つまり、半導体基板20の第1導電型の不純物濃度プロファイルは、半導体基板20の厚み方向に沿って、半導体基板20の第1主面21側から第2主面22側に向けて、第2不純物領域24、第1不純物領域23および第3不純物領域25をこの順番に有する。 第1不純物領域23の第1導電型の不純物濃度は、例えば、5×1013cm−3〜1×1017cm−3であり、5×1014cm−3〜2×1016cm−3が好ましい。
本変形例では、熱拡散法において半導体基板20の第1主面21と第2主面22にかかる熱量を変化させて、拡散幅の異なる不純物領域を形成することができる。
[4.1 変形例2に係る太陽電池セルの構成]
本変形例では、実施の形態1に係る太陽電池セル10と同様の積層構造を有する太陽電池セルにおいて、半導体基板20が図6に示す第1導電型の不純物濃度プロファイルを有する場合の例について説明する。つまり、半導体基板20の第1導電型の不純物濃度プロファイルは、半導体基板20の厚み方向に沿って、半導体基板20の第1主面21側から第2主面22側に向けて、第2不純物領域24、第1不純物領域23および第3不純物領域25をこの順番に有する。
本変形例では、半導体基板20の第2主面22側にのみ、熱拡散法により第3不純物領域を形成した後、半導体基板20の第1主面21側に、プラズマドープ法により第2不純物領域を形成できる。
[5.1 変形例3に係る太陽電池セルの構成]
本変形例では、実施の形態1に係る太陽電池セル10と同様の積層構造を有する太陽電池セルにおいて、半導体基板20が図7に示す第1導電型の不純物濃度プロファイルを有する場合の例について説明する。つまり、半導体基板20の第1導電型の不純物濃度プロファイルは、半導体基板20の厚み方向に沿って、半導体基板20の第1主面21側から第2主面22側に向けて、第2不純物領域24、第1不純物領域23および第3不純物領域25をこの順番に有する。
本変形例に係る太陽電池セルは、半導体基板20の第1主面および第2主面22側の両方に、熱拡散法により第1導電型の不純物であるリン(P)などを拡散した後、半導体基板20の第1主面21側に、プラズマドープ法により第1導電型の不純物であるリン(P)などを更に拡散することで形成できる。
[6.1 実施の形態3に係る太陽電池モジュールの構成]
実施の形態3に係る太陽電池モジュール11の概略構成について、図8および図9を参照しながら説明する。図8は、実施の形態3に係る太陽電池モジュール11の構造を示す断面図である。図9は、実施の形態3に係る太陽電池モジュール11を受光面から見た平面図である。
[7.1 太陽電池セルの他の製造方法]
実施の形態1に係る太陽電池セル10の他の製造方法について図10を参照しながら説明する。
以上、本発明に係る太陽電池セルおよび太陽電池モジュールについて、実施の形態および変形例に基づいて説明したが、本発明は、上記実施の形態および変形例に限定されるものではない。各実施の形態及び変形例に対して当業者が思いつく各種変形を施して得られる形態や、本発明の趣旨を逸脱しない範囲で各実施の形態および変形例における構成要素および機能を任意に組み合わせることで実現される形態も本発明に含まれる。
11 太陽電池モジュール
20 半導体基板
21 第1主面
22 第2主面
23 第1不純物領域
24 第2不純物領域
25 第3不純物領域
26、27 蓄積膜
30 第1半導体層
30a、40a 非晶質シリコン層
30i、40i 真性非晶質シリコン層
30n 第1導電型非晶質シリコン層
40 第2半導体層
40p 第2導電型非晶質シリコン層
50 第1電極
50m 第1金属電極
50t 第1透明導電膜
51m 第1バスバー電極
52m 第1フィンガー電極
60 第2電極
60m 第2金属電極
60t 第2透明導電膜
61m 第2バスバー電極
62m 第2フィンガー電極
70 保護膜
71 第1領域
72 第2領域
80 受光面保護材
81 受光面封止材
82 太陽電池ストリング
83 裏面封止材
84 裏面保護材
85 配線材
86 フレーム
Claims (5)
- 第1主面および前記第1主面に背向する第2主面を有する第1導電型の半導体基板と、
前記第1主面上に配置された前記第1導電型の第1半導体層と、
前記第2主面上に配置された前記第1導電型とは異なる第2導電型の第2半導体層と、を備え、
前記半導体基板は、
前記第1導電型の第1不純物領域と、
前記第1不純物領域と前記第1半導体層との間に配置された前記第1導電型の第2不純物領域と、
前記第1不純物領域と前記第2半導体層との間に配置された前記第1導電型の第3不純物領域と、を含み、
前記第2不純物領域の前記第1導電型の不純物濃度は、前記第3不純物領域の前記第1導電型の不純物濃度より高く、
前記第3不純物領域の前記第1導電型の不純物濃度は、前記第1不純物領域の前記第1導電型の不純物濃度より高い、太陽電池セル。 - 受光面および裏面を有する第1導電型の半導体基板と、
前記裏面の第1領域上に配置された前記第1導電型の第1半導体層と、
前記裏面の前記第1領域とは異なる第2領域上に配置された、前記第1導電型とは異なる第2導電型の第2半導体層と、を備え、
前記半導体基板は、
第1導電型の第1不純物領域と、
前記第1不純物領域および前記第1半導体層の間に配置される前記第1導電型の第2不純物領域と、
前記第1不純物領域および前記第2半導体層の間に配置される前記第1導電型の第3不純物領域と、を含み、
前記第2不純物領域の前記第1導電型の不純物濃度は、前記第3不純物領域の前記第1導電型の不純物濃度より高く、
前記第3不純物領域の前記第1導電型の不純物濃度は、前記第1不純物領域の前記第1導電型の不純物濃度より高い、太陽電池セル。 - 前記半導体基板は、単結晶シリコン基板であり、
前記第1半導体層および前記第2半導体層は、非晶質シリコン層である、請求項1または2に記載の太陽電池セル。 - 前記第1導電型は、n型であり、
前記第2導電型は、p型である、請求項1〜3のいずれか一項に記載の太陽電池セル。 - 複数の太陽電池セルを複数の配線材によって電気的に直列に接続した太陽電池ストリングを備える太陽電池モジュールであって、
前記複数の太陽電池セルのそれぞれは、請求項1〜4のいずれか一項に記載の太陽電池セルである、太陽電池モジュール。
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