JP7175900B2 - 半導体装置、及び表示装置 - Google Patents
半導体装置、及び表示装置 Download PDFInfo
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- JP7175900B2 JP7175900B2 JP2019538749A JP2019538749A JP7175900B2 JP 7175900 B2 JP7175900 B2 JP 7175900B2 JP 2019538749 A JP2019538749 A JP 2019538749A JP 2019538749 A JP2019538749 A JP 2019538749A JP 7175900 B2 JP7175900 B2 JP 7175900B2
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Description
本実施の形態では、本発明の一態様の半導体装置の構成例、及びその作製方法の例について説明する。
図1(A)は、トランジスタ100の上面図であり、図1(B)は、図1(A)に示す一点鎖線A1-A2における切断面の断面図に相当し、図1(C)は、図1(A)に示す一点鎖線B1-B2における切断面の断面図に相当する。なお、図1(A)において、トランジスタ100の構成要素の一部(ゲート絶縁層等)を省略して図示している。また、一点鎖線A1-A2方向をチャネル長方向、一点鎖線B1-B2方向をチャネル幅方向と呼称する場合がある。また、トランジスタの上面図においては、以降の図面においても図1(A)と同様に、構成要素の一部を省略して図示する場合がある。
図2(A)は、トランジスタ100Aの上面図であり、図2(B)はトランジスタ100Aのチャネル長方向の断面図であり、図2(C)はトランジスタ100Aのチャネル幅方向の断面図である。
図3(A)は、トランジスタ100Bの上面図であり、図3(B)はトランジスタ100Bのチャネル長方向の断面図であり、図3(C)はトランジスタ100Bのチャネル幅方向の断面図である。
図4(A)は、トランジスタ100Cの上面図であり、図4(B)はトランジスタ100Cのチャネル長方向の断面図であり、図4(C)はトランジスタ100Cのチャネル幅方向の断面図である。
次に、本実施の形態の半導体装置に含まれる構成要素について、詳細に説明する。
基板102の材質などに大きな制限はないが、少なくとも、後の熱処理に耐えうる程度の耐熱性を有している必要がある。例えば、ガラス基板、セラミック基板、石英基板、サファイア基板等を、基板102として用いてもよい。また、シリコンや炭化シリコンを材料とした単結晶半導体基板、多結晶半導体基板、シリコンゲルマニウム等の化合物半導体基板、SOI基板等を適用することも可能であり、これらの基板上に半導体素子が設けられたものを、基板102として用いてもよい。なお、基板102として、ガラス基板を用いる場合、第6世代(1500mm×1850mm)、第7世代(1870mm×2200mm)、第8世代(2200mm×2400mm)、第9世代(2400mm×2800mm)、第10世代(2950mm×3400mm)、又は第10.5世代、第11世代、又は第12世代など、サイズの大きな基板を用いることで、大型の表示装置を作製することができる。
ゲート電極として機能する導電層111及び導電層106、ソース電極として機能する導電層120a、ドレイン電極として機能する導電層120bとしては、クロム(Cr)、銅(Cu)、アルミニウム(Al)、金(Au)、銀(Ag)、亜鉛(Zn)、モリブデン(Mo)、タンタル(Ta)、チタン(Ti)、タングステン(W)、マンガン(Mn)、ニッケル(Ni)、鉄(Fe)、コバルト(Co)、ルテニウム(Ru)から選ばれた金属元素、又は上述した金属元素を成分とする合金か、上述した金属元素を組み合わせた合金等を用いてそれぞれ形成することができる。
キャップ層等として機能する絶縁層116、絶縁層113a、絶縁層113b、絶縁層119及び層104bとして、金属元素と、酸素又は窒素とを、有することが好ましい。なお、上記金属元素としては、アルミニウム、ハフニウム、ルテニウム、チタン、タンタル、タングステン、クロムなどの金属元素から選ばれるいずれか一つ又は複数を有する。つまり、キャップ層等として機能する絶縁層116、絶縁層113a、絶縁層113b、絶縁層119及び層104bとして、金属元素を有する窒化膜、又は金属元素を有する酸化膜を用いることができる。
絶縁層104としては、スパッタリング法、CVD法、蒸着法、パルスレーザー堆積(PLD)法、印刷法、塗布法等を適宜用いて形成することができる。また、絶縁層104としては、例えば、酸化物絶縁膜又は窒化物絶縁膜を単層又は積層して形成することができる。なお、半導体層108との界面特性を向上させるため、絶縁層104は、少なくとも半導体層108と接する領域は酸化物絶縁膜を含んでいることが好ましい。また、絶縁層104として加熱により酸素を放出する酸化物絶縁膜を用いることで、加熱処理により絶縁層104に含まれる酸素を、半導体層108に移動させることが可能である。
トランジスタ100等のゲート絶縁膜として機能する絶縁層110としては、プラズマ化学気相堆積(PECVD:Plasma Enhanced Chemical Vapor Deposition)法、スパッタリング法等により、酸化シリコン膜、酸化窒化シリコン膜、窒化酸化シリコン膜、窒化シリコン膜、酸化アルミニウム膜、酸化ハフニウム膜、酸化イットリウム膜、酸化ジルコニウム膜、酸化ガリウム膜、酸化タンタル膜、酸化マグネシウム膜、酸化ランタン膜、酸化セリウム膜及び酸化ネオジム膜を一種以上含む絶縁層を用いることができる。なお、絶縁層110を、2層の積層構造又は3層以上の積層構造としてもよい。
半導体層108がIn-M-Zn酸化物の場合、In-M-Zn酸化物を成膜するために用いるスパッタリングターゲットの金属元素の原子数比は、In≧Mを満たすことが好ましい。このようなスパッタリングターゲットの金属元素の原子数比として、In:M:Zn=1:1:0.5、In:M:Zn=1:1:1、In:M:Zn=1:1:1.2、In:M:Zn=2:1:3、In:M:Zn=3:1:2、In:M:Zn=4:2:4.1、In:M:Zn=5:1:6、In:M:Zn=5:1:7、In:M:Zn=5:1:8、In:M:Zn=6:1:6、In:M:Zn=5:2:5等が挙げられる。
以下では、本発明の一態様のトランジスタの作製方法例について説明する。ここでは、上記構成例2で例示したトランジスタ100Aを例に挙げて説明する。
基板102上に導電膜を形成し、これをエッチングにより加工して、第1のゲート電極として機能する導電層106を形成する(図5(A))。
続いて、基板102及び導電層106を覆って絶縁層104を形成する(図5(B))。絶縁層104は、プラズマCVD法、ALD法、スパッタリング法などを用いて形成することができる。
続いて、絶縁層104上に半導体層108aとなる半導体膜108A、及び半導体層108bとなる半導体膜108Bを形成する(図5(C))。
続いて、絶縁層104、半導体層108a及び半導体層108b上に、絶縁層116となる絶縁膜を成膜し、当該絶縁膜を加工することにより絶縁層116を形成する(図5(E))。
続いて、半導体層108及び絶縁層116上に、絶縁層109となる絶縁膜109fを成膜する(図6(A))。
続いて、導電層106と重なる領域の絶縁層116及び絶縁膜109fの一部をエッチングし、半導体層108bの一部を露出させる(図6(B))。
続いて、絶縁層109及び開口112上に半導体層108cとなる半導体膜を形成し、該半導体膜を加工することにより半導体層108cを形成する(図6(C))。
半導体層108cを形成した後、加熱処理を行う。このとき、窒素雰囲気で加熱処理を行い、続いて酸素雰囲気で加熱処理を行うことが好ましい。
続いて、絶縁層110を成膜する。絶縁層110は、プラズマCVD法又はスパッタリング法等により成膜することができる。絶縁層110は、絶縁層109と同様に欠陥の少ない緻密である酸化シリコン膜又は酸化窒化シリコン膜で形成されることが好ましい(図7(A))。
続いて、導電層106と重なる領域の絶縁層110、絶縁層109、絶縁層116及び絶縁層104の一部をエッチングし、導電層106の一部を露出させる(図9)。図9は、図1(A)に示す一点鎖線B1-B2における切断面の断面図に相当する。
続いて、絶縁層110上に、絶縁層113aとなる絶縁膜113Aと、導電層111となる導電膜111fを成膜する(図7(B))。絶縁膜113A及び導電膜111fは、金属又は合金のスパッタリングターゲットを用いたスパッタリング法により成膜することが好ましい。絶縁膜113A及び導電膜111fは、開口112を覆うように、絶縁層110上に成膜する。
続いて、絶縁層110、絶縁層113a、導電層111、絶縁層113bを覆って、絶縁膜118f及び絶縁膜119fを形成する(図8(B))。
続いて、絶縁層118の所望の位置に、リソグラフィによりマスクを形成した後、絶縁層118、絶縁層110、絶縁層109、及び絶縁層116の一部をエッチングすることで、半導体層108bに達する開口141a、開口141bを形成する(図8(C))。
続いて、開口141a、開口141bを覆うように、絶縁層118上に導電膜を成膜し、当該導電膜を所望の形状に加工することで、導電層120a、導電層120bを形成する。
本発明の一態様によれば、トランジスタを低温で作製することが可能なため、耐熱性の比較的低い基板上にトランジスタを作製することができる。一例として、可撓性を有する程度に薄い有機樹脂基板上に設けられたトランジスタについて説明する。
本実施の形態においては、先の実施の形態で例示したトランジスタを有する表示装置の一例について説明を行う。
図12(A)は、表示装置の一例を示す上面図である。図12(A)に示す表示装置700は、第1の基板701上に設けられた画素部702と、第1の基板701に設けられたソースドライバ回路部704及びゲートドライバ回路部706と、画素部702、ソースドライバ回路部704、及びゲートドライバ回路部706を囲むように配置されるシール材712と、第1の基板701に対向するように設けられる第2の基板705と、を有する。なお、第1の基板701と第2の基板705は、シール材712によって貼り合わされている。すなわち、画素部702、ソースドライバ回路部704、及びゲートドライバ回路部706は、第1の基板701とシール材712と第2の基板705によって封止されている。なお、図12(A)には図示しないが、第1の基板701と第2の基板705の間には表示素子が設けられる。
以下では、表示素子として液晶素子及びEL素子を用いる構成について、図13乃至図15を用いて説明する。なお、図13及び図14は、図12(A)に示す一点鎖線Q-Rにおける断面図であり、表示素子として液晶素子を用いた構成である。また、図15は、図12(A)に示す一点鎖線Q-Rにおける断面図であり、表示素子としてEL素子を用いた構成である。
図13乃至図15に示す表示装置700は、引き回し配線部711と、画素部702と、ソースドライバ回路部704と、FPC端子部708と、を有する。また、引き回し配線部711は、信号線710、又は信号線710aを有する。また、画素部702は、トランジスタ750及び容量素子790を有する。また、ソースドライバ回路部704は、トランジスタ752を有する。
図13に示す表示装置700は、液晶素子775を有する。液晶素子775は、導電膜772、導電膜774、及び液晶層776を有する。導電膜774は、第2の基板705側に設けられ、対向電極としての機能を有する。図13に示す表示装置700は、導電膜772と導電膜774に印加される電圧によって、液晶層776の配向状態が変わることによって光の透過、非透過が制御され画像を表示することができる。
図15に示す表示装置700は、発光素子782を有する。発光素子782は、導電膜772、EL層786、及び導電膜788を有する。図15に示す表示装置700は、画素毎に設けられる発光素子782が有するEL層786が発光することによって、画像を表示することができる。なお、EL層786は、有機化合物、又は量子ドットなどの無機化合物を有する。
また、図13乃至図15に示す表示装置700に入出力装置を設けてもよい。当該入出力装置としては、例えば、タッチパネル等が挙げられる。
本実施の形態では、本発明の一態様の半導体装置を有する表示装置について、図18を用いて説明を行う。
以下では、本発明の一態様の表示装置を適用可能な電子機器について説明する。ここでは、発電装置及び受電装置を備える電子機器を例に挙げて説明する。
本実施の形態では、本発明の一態様を用いて作製することができる表示モジュールについて説明する。
本実施の形態では、本発明の一態様を用いて作製された表示装置を備える電子機器について説明する。
本実施の形態では、本発明の一態様の電子機器について、図面を参照して説明する。
本実施の形態では、本発明の一態様の半導体装置を有する表示装置を適用することのできるテレビジョン装置の例について、図面を参照して説明する。
Claims (9)
- 第1乃至第6の絶縁層と、半導体層と、第1乃至第3の導電層と、第1の開口と、第2の開口とを有し、
前記第2の絶縁層は、前記第1の絶縁層上に位置し、
前記半導体層は、前記第1の絶縁層と前記第2の絶縁層との間に位置し、
前記第3の絶縁層は、前記第2の絶縁層上に位置し、
前記第4の絶縁層は、前記第3の絶縁層上に位置し、
前記第1の導電層は、前記半導体層と重なる領域を有し、かつ前記第3の絶縁層と前記第4の絶縁層との間に位置し、
前記第3の絶縁層は、前記第1の導電層の下面に接する領域と、前記第4の絶縁層と接する領域と、
を有し、
前記第4の絶縁層は、前記第1の導電層の上面及び側面に接し、
前記第5の絶縁層は、前記半導体層の上面及び側面に接し、
前記第5の絶縁層は、前記半導体層と重なり、かつ前記第1の導電層と重ならない領域に第1の開口及び第2の開口を有し、
前記第2の導電層は、前記第1の開口において前記半導体層と電気的に接続され、
前記第3の導電層は、前記第2の開口において前記半導体層と電気的に接続され、
前記第3の絶縁層、前記第4の絶縁層及び前記第5の絶縁層は、金属と、酸素又は窒素と、を有し、
前記第6の絶縁層は、前記第5の絶縁層の上面及び側面に接する領域と、前記第1の絶縁層と接する領域と、を有する、半導体装置。 - 請求項1において、
前記第3の絶縁層、前記第4の絶縁層及び前記第5の絶縁層は、アルミニウム又はハフニウムと、
酸素又は窒素と、を有する、半導体装置。 - 請求項1又は請求項2において、
さらに第7の絶縁層と、第4の導電層と、を有し、
前記第7の絶縁層は、前記第1の絶縁層と前記第3の導電層との間に位置し、
前記第4の導電層は、前記第1の導電層と重なる領域を有し、
前記第7の絶縁層は、金属と、酸素又は窒素と、を有する、半導体装置。 - 請求項3において、
前記第7の絶縁層は、アルミニウム又はハフニウムと、酸素又は窒素と、を有する、半導体装置。 - 請求項1乃至請求項4のいずれか一において、
さらに第8及び第9の絶縁層を有し、
前記第9の絶縁層は、前記第1の絶縁層及び前記第4の絶縁層上に位置し、
前記第8の絶縁層は、前記第1の絶縁層と前記第9の絶縁層との間に位置し、
前記第9の絶縁層は、金属と、酸素又は窒素と、を有する、半導体装置。 - 請求項5において、
前記第9の絶縁層は、アルミニウム又はハフニウムと、酸素又は窒素と、を有する、半導体装置。 - 請求項1乃至請求項6のいずれか一において、
さらに前記第5の絶縁層及び前記第6の絶縁層に設けられた第3の開口を有し、
前記第3の開口の内側に、前記第2の絶縁層及び前記第1の導電層が位置する、半導体装置。 - 請求項1乃至請求項7のいずれか一において、
前記半導体層は、金属酸化物を有する、半導体装置。 - 請求項1乃至請求項8のいずれか一に記載の半導体装置と、
前記半導体装置と電気的に接続される液晶素子又は発光素子と、を有する、表示装置。
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