JP6189182B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6189182B2 JP6189182B2 JP2013231888A JP2013231888A JP6189182B2 JP 6189182 B2 JP6189182 B2 JP 6189182B2 JP 2013231888 A JP2013231888 A JP 2013231888A JP 2013231888 A JP2013231888 A JP 2013231888A JP 6189182 B2 JP6189182 B2 JP 6189182B2
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Description
本実施の形態では、本発明の一態様であるトランジスタについて説明する。
図1に、BGTC構造であるトランジスタの上面図及び断面図を示す。図1(A)は、トランジスタの上面図を示す。図1(A)において、一点鎖線A1−A2に対応する断面図を図1(B)に示す。また、図1(A)において、一点鎖線A3−A4に対応する断面図を図1(C)に示す。なお、図1(A)において、図面の明瞭化のために当該トランジスタの構成要素の一部(ゲート絶縁膜、及び保護絶縁膜など)を省略している。
以下では、多層膜106と、多層膜106を構成する酸化物半導体膜106a及び酸化物膜106bとについて、図1及び図2を用いて説明する。
ソース電極116a及びドレイン電極116bは、アルミニウム、チタン、クロム、コバルト、ニッケル、銅、イットリウム、ジルコニウム、モリブデン、ルテニウム、銀、タンタル及びタングステンを一種以上含む導電膜を、単層で、又は積層で用いることができる。好ましくは、ソース電極116a及びドレイン電極116bは、銅を含む層を有する多層膜とする。ソース電極116a及びドレイン電極116bとして、銅を含む層を有する多層膜を用いることで、ソース電極116a及びドレイン電極116bと同一層で配線を形成する場合、配線抵抗を低くすることができる。なお、ソース電極116aとドレイン電極116bは同一組成であってもよいし、異なる組成であってもよい。
保護絶縁膜118は、酸化アルミニウム、酸化マグネシウム、酸化シリコン、酸化窒化シリコン、窒化酸化シリコン、窒化シリコン、酸化ガリウム、酸化ゲルマニウム、酸化イットリウム、酸化ジルコニウム、酸化ランタン、酸化ネオジム、酸化ハフニウム及び酸化タンタルを一種以上含む絶縁膜を、単層で、又は積層で用いればよい。
ゲート絶縁膜112は、酸化アルミニウム、酸化マグネシウム、酸化シリコン、酸化窒化シリコン、窒化酸化シリコン、窒化シリコン、酸化ガリウム、酸化ゲルマニウム、酸化イットリウム、酸化ジルコニウム、酸化ランタン、酸化ネオジム、酸化ハフニウム及び酸化タンタルを一種以上含む絶縁膜を、単層で、又は積層で用いればよい。
ゲート電極104は、アルミニウム、チタン、クロム、コバルト、ニッケル、銅、イットリウム、ジルコニウム、モリブデン、ルテニウム、銀、タンタル及びタングステンを一種以上含む導電膜を、単層で、又は積層で用いればよい。
基板100に大きな制限はない。例えば、ガラス基板、セラミック基板、石英基板、サファイア基板などを、基板100として用いてもよい。また、シリコンや炭化シリコンなどの単結晶半導体基板、多結晶半導体基板、シリコンゲルマニウムなどの化合物半導体基板、SOI(Silicon On Insulator)基板など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100として用いてもよい。
ここで、トランジスタの作製方法について図5及び図6を用いて説明する。
ここでは、図1に示したトランジスタの変形例であるトランジスタについて図7を用いて説明する。
本実施の形態では、本発明の一態様であり、実施の形態1の構造とは一部異なるトランジスタについて説明する。
本項では、トップゲート型トランジスタについて説明する。ここでは、トップゲート型トランジスタの一種であるトップゲートトップコンタクト構造(TGTC構造)のトランジスタについて図8を用いて説明する。
多層膜206は、酸化物半導体膜206aの上下に酸化物膜206bと、酸化物膜206cが積層された構造である。酸化物半導体膜206aの下面とは、酸化物半導体膜206aの基板200側の面、又は酸化物膜206cとの境界面に相当する。酸化物膜206bの下面とは、酸化物膜206bの基板200側の面、又は酸化物半導体膜206aとの境界面に相当する。酸化物膜206cの下面とは、酸化物膜206cの基板200側の面、又は酸化物膜206cのゲート絶縁膜112に接する面に相当する。なお、多層膜206の積層構造は、STEM(Scanning Transmission Electron Microscopy)を用いて観察することによって、その境界を確認することができる。しかし、酸化物半導体膜206a、酸化物膜206b及び酸化物膜206cに用いる材料によっては、当該境界を明確に確認できない場合がある。
基板200は、基板100についての記載を参照できる。また、ソース電極216a及びドレイン電極216bは、ソース電極116a及びドレイン電極116bについての記載を参照できる。また、ゲート絶縁膜212は、ゲート絶縁膜112についての記載を参照できる。また、ゲート電極204は、ゲート電極104についての記載を参照できる。また、保護絶縁膜218は、保護絶縁膜118についての記載を参照できる。
ここで、トランジスタの作製方法について図11及び図12を用いて説明する。
ここでは、図8に示したトランジスタの変形例であるトランジスタについて図13を用いて説明する。
ここでは、図8に示したトランジスタの変形例であるトランジスタについて図14を用いて説明する。
例えば、図8に示したトランジスタにおいて、ソース電極212a及びドレイン電極212bの上面、並びに多層膜206の上面と、ゲート絶縁膜212との間に、図14に示したトランジスタの酸化物膜207を設けた構造のトランジスタも本発明の一態様に含まれる。
本実施の形態では、上記実施の形態で記載したトランジスタを用いた半導体装置について説明する。
ここでは、上記実施の形態で記載したトランジスタを用いた半導体装置の一つである表示装置について説明する。
ここでは、EL素子を用いた表示装置(EL表示装置ともいう。)について説明する。
次に、液晶素子を用いた表示装置(液晶表示装置ともいう。)について説明する。
上述したトランジスタは、さまざまな電子機器に搭載されるマイクロコンピュータに適用することができる。
図22は、上述したトランジスタを少なくとも一部に用いたCPUの具体的な構成を示すブロック図である。
図23(A)において、警報装置8100は、住宅用火災警報器であり、検出部と、マイクロコンピュータ8101を有している。マイクロコンピュータ8101には、上述したトランジスタを用いたCPUが含まれる。
Claims (1)
- 酸化物半導体膜及び酸化物膜が積層された多層膜と、ゲート電極と、ゲート絶縁膜と、ソース電極と、ドレイン電極と、を有し、
前記酸化物半導体膜は、In−M−Zn酸化物(MはAl、Ga、Ge、Y、Zr、Sn、La、Ce、又はNd)を有し、
前記酸化物膜は、In−M−Zn酸化物(MはAl、Ga、Ge、Y、Zr、Sn、La、Ce、又はNd)を有し、
前記酸化物膜は、前記酸化物半導体膜よりもMに対するInの原子数比が小さく、
前記酸化物膜のMの原子数比は、前記酸化物膜のInの原子数比以上であり、
前記酸化物膜は、前記酸化物半導体膜の上面と接して設けられ、
前記酸化物半導体膜の上端と前記酸化物膜の下端が略一致し、
前記多層膜は、前記ゲート絶縁膜を介して前記ゲート電極と重なる第1の領域と、前記ゲート電極と重ならない第2の領域と、を有し、
前記酸化物半導体膜の下面と前記酸化物半導体膜の側面とは、第1の角度をなし、
前記酸化物膜の下面と前記酸化物膜の側面とは、第2の角度をなし、
前記第1の角度は、前記第2の角度よりも小さく、且つ鋭角であり、
前記ソース電極は、前記酸化物膜の上面に接する領域と、前記酸化物膜の側面に接する領域と、前記酸化物半導体膜の側面に接する領域と、を有し、
前記ドレイン電極は、前記酸化物膜の上面に接する領域と、前記酸化物膜の側面に接する領域と、前記酸化物半導体膜の側面に接する領域と、を有することを特徴とする半導体装置。
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