JP2021039183A - 半導体装置、表示装置、及び光電変換装置 - Google Patents
半導体装置、表示装置、及び光電変換装置 Download PDFInfo
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- JP2021039183A JP2021039183A JP2019158971A JP2019158971A JP2021039183A JP 2021039183 A JP2021039183 A JP 2021039183A JP 2019158971 A JP2019158971 A JP 2019158971A JP 2019158971 A JP2019158971 A JP 2019158971A JP 2021039183 A JP2021039183 A JP 2021039183A
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Abstract
【解決手段】半導体装置は、素子基板の上に配される第1電極20と、第1電極の端を覆い、素子基板の上に配される絶縁層30と、第1電極及び絶縁層の上に配される機能層40と、機能層を挟んで第1電極及び絶縁層の上に配される第2電極50と、を有し、素子基板、絶縁層、及び機能層を通る断面において、絶縁層は、第1電極の下面に平行な平行面に対して45°以上90°以下で傾斜する第1部分312、第1部分より素子基板側にあり平行面に対して0°より大きく45°未満で傾斜する第2部分313、及び第1部分に対して前記機能層側にあり0°より大きく45°未満で傾斜する第3部分311を有し、第2部分の平行面に垂直な方向における長さは、第3部分の垂直な方向における長さより大きい。
【選択図】図3
Description
本実施の形態では、半導体装置の一例である発光装置が表示装置に適用される例について説明する。図1は本実施の形態に係る表示装置の画素領域の一部の平面構成図を示している。基板上には複数の発光素子10がデルタ状に配列されており、隣接する3つの素子10R、10B、10Gで一つの画素を構成している。
図9は、本実施の形態に係る発光装置の図である。なお、実施の形態1における発光装置10と共通する部分については説明を省略する。
本実施の形態では、実施の形態1または2に係る発光装置の具体的な構成、及び適用例について、図10乃至図14を用いて説明する。
発光素子10は、最表面に層間絶縁層を有する素子基板の上に、陽極、有機化合物層、陰極が配される。陰極の上には、保護層、カラーフィルタ等を設けてよい。カラーフィルタを設ける場合は、保護層との間に平坦化層を設けてよい。平坦化層はアクリル樹脂等で構成することができる。
基板は、石英、ガラス、シリコンウエハ、樹脂、金属等が挙げられる。また、基板上には、トランジスタなどのスイッチング素子や配線を備え、その上に絶縁層を備えてもよい。絶縁層としては、陽極2と配線の導通を確保するために、コンタクトホールを形成可能で、かつ接続しない配線との絶縁を確保できれば、材料は問わない。例えば、ポリイミド等の樹脂、酸化シリコン、窒化シリコンなどを用いることができる。
層間絶縁層は、例えば酸化シリコン(SiOx)、窒化シリコン(SiNx)、酸窒化シリコン(SION)などの無機材料、あるいはアクリルやポリイミドなどの有機材料から形成することができる。
電極は、一対の電極を用いることができる。一対の電極は、陽極と陰極であってよい。有機発光素子が発光する方向に電界を印加する場合に、電位が高い電極が陽極であり、他方が陰極である。また、発光層にホールを供給する電極が陽極であり、電子を供給する電極が陰極であるということもできる。
陰極の上に、保護層を設けてもよい。例えば、陰極上に吸湿剤を設けたガラスを接着することで、有機化合物層に対する水等の浸入を抑え、表示不良の発生を抑えることができる。また、別の実施形態としては、陰極上に窒化ケイ素等のパッシベーション膜を設け、有機EL層に対する水等の浸入を抑えてもよい。例えば、陰極7形成後に真空を破らずに別のチャンバーに搬送し、CVD法で厚さ2μmの窒化ケイ素膜を形成することで、保護層としてもよい。CVD法の成膜の後で原子堆積法(ALD法)を用いた保護層を設けてもよい。
保護層の上にカラーフィルタを設けてもよい。例えば、有機発光素子のサイズを考慮したカラーフィルタを別の基板上に設け、それと有機発光素子を設けた基板と貼り合わせてもよいし、上記で示した保護層上にフォトリソグラフィ技術を用いて、カラーフィルタをパターニングしてもよい。カラーフィルタは、高分子で構成されてよい。
カラーフィルタと保護層との間に平坦化層を有してもよい。平坦化層は有機化合物で構成されてよく、低分子であっても、高分子であってもよいが、高分子であることが好ましい。
平坦化層の上には、対向基板を有してよい。対抗基板は、前述の基板と対応する位置に設けられるため、対向基板と呼ばれる。対向基板の構成材料は、前述の基板と同じであってよい。
一実施の形態に係る発光素子を構成する有機層(正孔注入層、正孔輸送層、電子阻止層、発光層、正孔阻止層、電子輸送層、電子注入層等)は、以下に示す方法により形成される。
実施形態に係る発光装置は、表示装置や照明装置の構成部材として用いることができる。他にも、電子写真方式の画像形成装置の露光光源や液晶表示装置のバックライト、白色光源にカラーフィルタを有する発光装置等の用途がある。
10 発光素子
20 第一電極
30 絶縁膜
40 有機層
50 第二電極
60 保護層
70 カラーフィルタ
80 平坦化層
100 有機発光素子
Claims (15)
- 素子基板の上に配される第1電極と、
前記第1電極の端を覆い、前記素子基板の上に配される絶縁層と、
前記第1電極及び前記絶縁層の上に配される機能層と、
前記機能層を挟んで前記第1電極及び前記絶縁層の上に配される第2電極と、
を有し、
前記素子基板、前記絶縁層、及び前記機能層を通る断面において、前記絶縁層は、
前記第1電極の下面に平行な平行面に対して45°以上90°以下で傾斜する側面を有する第1部分、
前記第1部分より前記素子基板側にあり前記平行面に対して0°より大きく45°未満で傾斜する側面を有する第2部分、及び
前記第1部分に対して前記素子基板とは反対の側にあり0°より大きく45°未満で傾斜する側面を有する第3部分
を有し、
前記断面において、前記第2部分の前記平行面に垂直な方向における長さは、前記第3部分の前記垂直な方向における長さより大きい半導体装置。 - 前記第1部分の前記平行面に垂直な方向における長さが、前記第1電極の厚みより小さい請求項1に記載の半導体装置。
- 前記第1部分は、前記平行面に対し55°以上90°以下で傾斜する側面を有する第4部分を有し、前記第4部分の前記平行面に垂直な方向における長さは、50nm以下である請求項1または2に記載の半導体装置。
- 前記絶縁層は、更に、前記第2部分より前記素子基板側にあり、前記平行面と平行な側面を有する第5部分を有する請求項1乃至3のいずれか1項に記載の半導体装置。
- 前記絶縁層は、無機材料を主成分とする請求項1乃至4のいずれか1項に記載の半導体装置。
- 前記絶縁層は、酸化シリコン、窒化シリコン、酸窒化シリコンの少なくとも1つを有する請求項1乃至5のいずれか1項に記載の半導体装置。
- 前記素子基板は基板とその上に配された層間絶縁層とを有し、
前記層間絶縁層は、記第1電極の前記下面と接する第1絶縁部分と、前記第1絶縁部分の隣に位置し前記絶縁層と接する第2絶縁部分を有し、
前記断面において、前記第2絶縁部分の上面は前記平行面に対して傾斜する請求項1乃至6のいずれか1項に記載の半導体装置。 - 前記断面において、前記第2絶縁部分の前記上面は、前記平行面に対し45°未満で傾斜する請求項7に記載の半導体装置。
- 前記断面において、前記垂直な方向における記第1電極の前記下面から前記基板までの距離より、前記垂直な方向における前記第2絶縁部分の前記上面から前記基板までの距離が小さい請求項8に記載の半導体装置。
- 複数のレンズを有する光学部と、前記光学部を通過した光を受光する撮像素子と、前記撮像素子が撮像した画像を表示する表示部と、を有し、
前記表示部は請求項1乃至8のいずれか一項に記載の半導体装置を有することを特徴とする光電変換装置。 - 請求項1乃至8のいずれか一項に記載の半導体装置を有する表示部と、前記表示部が設けられた筐体と、前記筐体に設けられ、外部と通信する通信部と、を有することを特徴とする電子機器。
- 請求項1乃至8のいずれか一項に記載の半導体装置を有する光源と、前記光源が発する光を透過する光拡散部または光学フィルムと、を有することを特徴とする照明装置。
- 請求項1乃至8のいずれか一項に記載の半導体装置を有する灯具と、前記灯具が設けられた機体と、を有することを特徴とする移動体。
- 複数のレンズを有する光学部と、前記光学部を通過した光を受光する撮像部と、を有し、
前記撮像部は、請求項1乃至8のいずれか1項に記載の半導体装置を有することを特徴とする光電変換装置。 - 請求項1乃至8のいずれか一項に記載の半導体装置を有し、
複数の画素を有し、前記複数の画素の少なくとも一つが、前記第1電極、前記機能層、及び前記第2電極を有する発光素子と、前記発光素子に接続されたトランジスタと、を有することを特徴とする表示装置。
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