JP6929079B2 - 半導体装置の作製方法 - Google Patents
半導体装置の作製方法 Download PDFInfo
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- JP6929079B2 JP6929079B2 JP2017022776A JP2017022776A JP6929079B2 JP 6929079 B2 JP6929079 B2 JP 6929079B2 JP 2017022776 A JP2017022776 A JP 2017022776A JP 2017022776 A JP2017022776 A JP 2017022776A JP 6929079 B2 JP6929079 B2 JP 6929079B2
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Images
Classifications
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- H01L21/0214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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Description
本実施の形態では、本発明の一態様の、過剰酸素領域を有するゲート絶縁膜を有する半導体装置について説明する。また、本発明の一態様の半導体装置の作製方法について、説明する。
図1(A)は、本発明の一態様の半導体装置であるトランジスタ100の上面図であり、図1(B)は、図1(A)に示す一点鎖線X1−X2間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Y1−Y2間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、煩雑になることを避けるため、トランジスタ100の構成要素の一部(ゲート絶縁膜として機能する絶縁膜等)を省略して図示している。また、一点鎖線X1−X2方向をチャネル長方向、一点鎖線Y1−Y2方向をチャネル幅方向と呼称する場合がある。なお、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。
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)等の大面積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。
絶縁膜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、絶縁膜104としては、例えば、酸化物絶縁膜または窒化物絶縁膜を単層または積層して形成することができる。なお、酸化物半導体膜108との界面特性を向上させるため、絶縁膜104において少なくとも酸化物半導体膜108と接する領域は酸化物絶縁膜で形成することが好ましい。また、絶縁膜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膜104に含まれる酸素を、酸化物半導体膜108に移動させることが可能である。
ゲート電極として機能する導電膜112、ソース電極として機能する導電膜120a、ドレイン電極として機能する導電膜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)から選ばれた金属元素、また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。
本発明の一態様のトランジスタ100のゲート絶縁膜として機能する絶縁膜110は、単層もしくは積層構造であり、プラズマ化学気相堆積法により形成される酸化窒化シリコン膜を有する。また絶縁膜110には酸素プラズマ処理を行う。
酸化物半導体膜108としては、先に示す材料を用いることができる。
絶縁膜116は、窒素または水素を有する。絶縁膜116としては、例えば、窒化物絶縁膜が挙げられる。該窒化物絶縁膜としては、具体的には、窒化シリコン、窒化酸化シリコン、酸化窒化シリコン等を含む膜が挙げられる。絶縁膜116に含まれる水素濃度は、1×1022atoms/cm3以上であると好ましい。また、絶縁膜116は、酸化物半導体膜108の第2の領域108nと接する。したがって、絶縁膜116と接する第2の領域108n中の不純物(窒素または水素)濃度が高くなり、第2の領域108nのキャリア密度を高めることができる。
絶縁膜118としては、酸化物絶縁膜を用いることができる。また、絶縁膜118としては、酸化物絶縁膜と、窒化物絶縁膜との積層膜を用いることができる。絶縁膜118として、例えば酸化シリコン、酸化窒化シリコン、窒化酸化シリコン、酸化アルミニウム、酸化ハフニウム、酸化ガリウムまたはGa−Zn酸化物などを用いればよい。
次に、図1(A)(B)(C)に示すトランジスタと異なる構成について、図2(A)(B)(C)を用いて説明する。
次に、図2(A)(B)(C)に示すトランジスタ100Aと異なる構成について、図4を用いて説明する。
次に、図2(A)(B)(C)に示すトランジスタ100Aの作製方法の一例について、図5乃至図7を用いて説明する。なお、図5乃至図7は、トランジスタ100Aの作製方法を説明するチャネル長(L)方向、及びチャネル幅(W)方向の断面図である。
本実施の形態においては、実施の形態1に示した本発明の一態様に用いることのできるトランジスタの変形例を示す。
本実施の形態においては、本発明の一態様に用いることのできる、酸化物半導体について説明する。
酸化物半導体は、少なくともインジウムまたは亜鉛を含むことが好ましい。特にインジウムおよび亜鉛を含むことが好ましい。また、それらに加えて、アルミニウム、ガリウム、イットリウムまたはスズなどが含まれていることが好ましい。また、ホウ素、シリコン、チタン、鉄、ニッケル、ゲルマニウム、ジルコニウム、モリブデン、ランタン、セリウム、ネオジム、ハフニウム、タンタル、タングステン、またはマグネシウムなどから選ばれた一種、または複数種が含まれていてもよい。
酸化物半導体は、単結晶酸化物半導体と、それ以外の非単結晶酸化物半導体と、に分けられる。非単結晶酸化物半導体としては、例えば、CAAC−OS(c−axis aligned crystalline oxide semiconductor)、多結晶酸化物半導体、nc−OS(nanocrystalline oxide semiconductor)、擬似非晶質酸化物半導体(a−like OS:amorphous−like oxide semiconductor)および非晶質酸化物半導体などがある。
次に、図8(A)、図8(B)、および図8(C)を用いて、本発明に係る酸化物半導体が有するインジウム、元素Mおよび亜鉛の原子数比の好ましい範囲について説明する。なお、図8(A)、図8(B)、および図8(C)には、酸素の原子数比については記載しない。また、酸化物半導体が有するインジウム、元素M、および亜鉛の原子数比のそれぞれの項を[In]、[M]、および[Zn]とする。
続いて、上記酸化物半導体をトランジスタに用いる場合について説明する。
ここで、酸化物半導体中における各不純物の影響について説明する。
続いて、該酸化物半導体を2層構造、または3層構造とした場合について述べる。酸化物半導体S1、酸化物半導体S2、および酸化物半導体S3の積層構造、および積層構造に接する絶縁体のバンド図と、酸化物半導体S2および酸化物半導体S3の積層構造、および積層構造に接する絶縁体のバンド図と、酸化物半導体S1および酸化物半導体S2の積層構造、および積層構造に接する絶縁体のバンド図と、について、図9を用いて説明する。
続いて、酸化物半導体をトランジスタに用いる構成について説明する。
以下では、本発明の一態様で開示されるトランジスタに用いることができるCAC(Cloud−Aligned Composite)−OSの構成について説明する。
本発明の一態様のトランジスタ100の有する、導電膜112に酸化物導電体を用いると、絶縁膜110中に過剰酸素を添加することができ、さらにそれを酸化物半導体膜108が有する第1の領域108iに拡散できるので、好適である。このとき、酸化窒化シリコン膜を含む絶縁膜110の欠陥も減らすことができる可能性がある。本実施の形態では、導電膜112に酸化物導電体を用いたときの、絶縁膜110の欠陥について説明する。
本実施の形態では、基板温度を350℃として酸化窒化シリコン膜を成膜して絶縁膜110を形成するときの、トランジスタ100の特性について示す。
本実施の形態においては、先の実施の形態で例示した半導体装置を有する表示装置の一例について、図15乃至図20を用いて以下説明を行う。
図16乃至図18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、シール材712と、を有する。また、引き回し配線部711は、信号線710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16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16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18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18に示す表示装置700は、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、または量子ドットなどの無機化合物を有する。
また、図17及び図18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23を用いて説明を行う。
図23(A)に示す表示装置は、表示素子の画素を有する領域(以下、画素部502という)と、画素部502の外側に配置され、画素を駆動するための回路を有する回路部(以下、駆動回路部504という)と、素子の保護機能を有する回路(以下、保護回路506という)と、端子部507と、を有する。なお、保護回路506は、設けない構成としてもよい。
本実施の形態では、上述の実施の形態で説明したトランジスタの適用可能な回路構成の一例について、図24乃至図27を用いて説明する。
図24(A)には、駆動回路が有するシフトレジスタやバッファ等に適用することができるインバータの回路図を示す。インバータ800は、入力端子INに与える信号の論理を反転した信号を出力端子OUTに出力する。インバータ800は、複数のOSトランジスタを有する。信号SBGは、OSトランジスタの電気特性を切り替えることができる信号である。
本実施の形態では、上述の実施の形態で説明した酸化物半導体を有するトランジスタ(OSトランジスタ)を、複数の回路に用いる半導体装置の一例について、図28乃至図31を用いて説明する。
図28(A)は、半導体装置900のブロック図である。半導体装置900は、電源回路901、回路902、電圧生成回路903、回路904、電圧生成回路905および回路906を有する。
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モジュール及び電子機器について、図32乃至図35を用いて説明を行う。
図32に示す表示モジュール7000は、上部カバー7001と下部カバー7002との間に、FPC7003に接続されたタッチパネル7004、FPC7005に接続された表示パネル7006、バックライト7007、フレーム7009、プリント基板7010、バッテリ7011を有する。
次に、図33(A)乃至図33(E)に電子機器の一例を示す。
次に、図33(A)乃至図33(E)に示す電子機器と、異なる電子機器の一例を図34(A)乃至図34(G)に示す。
<半導体回路>
本明細書等に開示したトランジスタは、OR回路、AND回路、NAND回路、およびNOR回路などの論理回路や、インバータ回路、バッファ回路、シフトレジスタ回路、フリップフロップ回路、エンコーダ回路、デコーダ回路、増幅回路、アナログスイッチ回路、積分回路、微分回路、およびメモリ素子などの様々な半導体回路に用いることができる。
図47(A)に示す半導体回路は、トランジスタ289のソースまたはドレインの一方を、トランジスタ1281のゲートおよび容量素子257の一方の電極に接続した記憶装置の構成例を示している。また、図47(B)に示す回路は、トランジスタ289のソースまたはドレインの一方を、容量素子257の一方の電極に接続した記憶装置の構成例を示している。
情報の書き込みおよび保持について説明する。まず、配線254の電位を、トランジスタ289がオン状態となる電位にする。これにより、配線253の電位が、ノード256に与えられる。即ち、ノード256に所定の電荷が与えられる(書き込み)。ここでは、異なる二つの電位レベルを与える電荷(以下、「Lowレベル電荷」、「Highレベル電荷」という。)のどちらかが与えられるものとする。その後、配線254の電位を、トランジスタ289がオフ状態となる電位とすることで、ノード256に電荷が保持される。
次に情報の読み出しについて説明する。配線251に配線252の電位と異なる所定の電位(定電位)を与えた状態で、配線255に読み出し電位VRを与えると、ノード256に保持されている情報を読み出すことができる。
次に、上述したトランジスタを用いたCPUの一例について説明する。図48は、上述したトランジスタを一部に用いたCPUの構成例を示すブロック図である。
100A トランジスタ
100B トランジスタ
100C トランジスタ
102 基板
104 絶縁膜
106 導電膜
108 酸化物半導体膜
108i 領域
108i_0 酸化物半導体膜
108n 領域
108n_2 領域
110 絶縁膜
110_0 絶縁膜
112 導電膜
112_0 導電膜
112_1 導電膜
112_2 導電膜
116 絶縁膜
118 絶縁膜
120a 導電膜
120b 導電膜
122 絶縁膜
140 マスク
141a 開口部
141b 開口部
143 開口部
201 トランジスタ
202 トランジスタ
203 トランジスタ
216 プロファイル
217 プロファイル
218 プロファイル
220 矢印
221 試料
222 試料
223 試料
225 領域
226 試料
227 試料
228 試料
231 破線
232 実線
235 破線
241 試料
242 試料
243 試料
244 試料
251 配線
252 配線
253 配線
254 配線
255 配線
256 ノード
257 容量素子
281 トランジスタ
282 トランジスタ
289 トランジスタ
310 領域
311 領域
312 領域
317 サンプル
318 サンプル
319 シリコン
321 領域
325 金属膜
329 重心位置
351 試料
352 試料
353 試料
354 試料
355 試料
356 試料
357 点線
365 試料
366 試料
367 試料
368 導電膜
370 酸化物半導体膜
376 プラスGBT(ダーク)
377 マイナスGBT(ダーク)
378 プラスGBT(光照射)
379 マイナスGBT(光照射)
381 試料
382 試料
501 画素回路
502 画素部
504 駆動回路部
504a ゲートドライバ
504b ソースドライバ
506 保護回路
507 端子部
550 トランジスタ
552 トランジスタ
554 トランジスタ
560 容量素子
562 容量素子
570 液晶素子
572 発光素子
700 表示装置
701 基板
702 画素部
704 ソースドライバ回路部
705 基板
706 ゲートドライバ回路部
708 FPC端子部
710 信号線
711 配線部
712 シール材
716 FPC
730 絶縁膜
732 封止膜
734 絶縁膜
736 着色膜
738 遮光膜
750 トランジスタ
752 トランジスタ
760 接続電極
770 平坦化絶縁膜
772 導電膜
773 絶縁膜
774 導電膜
775 液晶素子
776 液晶層
778 構造体
780 異方性導電膜
782 発光素子
783 液滴吐出装置
784 液滴
785 層
786 EL層
788 導電膜
790 容量素子
791 タッチパネル
792 絶縁膜
793 電極
794 電極
795 絶縁膜
796 電極
797 絶縁膜
800 インバータ
810 OSトランジスタ
820 OSトランジスタ
831 信号波形
832 信号波形
840 破線
841 実線
850 OSトランジスタ
860 CMOSインバータ
900 半導体装置
901 電源回路
902 回路
903 電圧生成回路
903A 電圧生成回路
903B 電圧生成回路
903C 電圧生成回路
904 回路
905 電圧生成回路
906 回路
911 トランジスタ
912 トランジスタ
912A トランジスタ
912B トランジスタ
921 制御回路
922 トランジスタ
1189 インターフェース
1190 基板
1191 ALU
1192 コントローラ
1193 デコーダ
1194 コントローラ
1195 コントローラ
1196 レジスタ
1197 コントローラ
1198 インターフェース
1199 ROM
1281 トランジスタ
1400 液滴吐出装置
1402 基板
1403 液滴吐出手段
1404 撮像手段
1405 ヘッド
1406 点線
1407 制御手段
1408 記憶媒体
1409 画像処理手段
1410 コンピュータ
1411 マーカー
1412 ヘッド
1413 材料供給源
1414 材料供給源
1701 回路
1707 容量素子
1708 容量素子
1709 トランジスタ
1710 トランジスタ
1713 トランジスタ
1714 トランジスタ
1720 回路
7000 表示モジュール
7001 上部カバー
7002 下部カバー
7003 FPC
7004 タッチパネル
7005 FPC
7006 表示パネル
7007 バックライト
7008 光源
7009 フレーム
7010 プリント基板
7011 バッテリ
8000 カメラ
8001 筐体
8002 表示部
8003 操作ボタン
8004 シャッターボタン
8006 レンズ
8100 ファインダー
8101 筐体
8102 表示部
8103 ボタン
8200 ヘッドマウントディスプレイ
8201 装着部
8202 レンズ
8203 本体
8204 表示部
8205 ケーブル
8206 バッテリ
8300 ヘッドマウントディスプレイ
8301 筐体
8302 表示部
8304 固定具
8305 レンズ
9000 筐体
9001 表示部
9003 スピーカ
9005 操作キー
9006 接続端子
9007 センサ
9008 マイクロフォン
9050 操作ボタン
9051 情報
9052 情報
9053 情報
9054 情報
9055 ヒンジ
9100 テレビジョン装置
9101 携帯情報端末
9102 携帯情報端末
9200 携帯情報端末
9201 携帯情報端末
9500 表示装置
9501 表示パネル
9502 表示領域
9503 領域
9511 軸部
9512 軸受部
Claims (3)
- 基板上に酸化物半導体膜を形成し、
前記酸化物半導体膜上に、酸化窒化シリコン膜を含むゲート絶縁層を形成し、
酸素を含む雰囲気で酸化物半導体をスパッタリング法にて形成して、前記ゲート絶縁層に酸素を添加しつつ前記ゲート絶縁層上にゲート電極を形成した後、150℃以上450℃以下の加熱処理を行い、
前記酸化物半導体膜に前記ゲート絶縁層の酸素を拡散させ、前記酸化物半導体膜の導電率を下げる半導体装置の作製方法。 - 基板上に酸化物半導体膜を形成し、
前記酸化物半導体膜上に、酸化窒化シリコン膜を含むゲート絶縁層を形成し、
酸素を含む雰囲気で酸化物半導体をスパッタリング法にて形成して、前記ゲート絶縁層に酸素を添加しつつ前記ゲート絶縁層上にゲート電極を形成した後、150℃以上450℃以下の加熱処理を行う半導体装置の作製方法。 - 請求項1または請求項2において、前記酸化窒化シリコン膜は、プラズマCVD法にて、350℃以下の基板温度で成膜する半導体装置の作製方法。
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DE112017000905T5 (de) | 2018-10-25 |
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WO2017141140A1 (en) | 2017-08-24 |
CN108738364A (zh) | 2018-11-02 |
CN115172467A (zh) | 2022-10-11 |
TWI755375B (zh) | 2022-02-21 |
US10204798B2 (en) | 2019-02-12 |
TW201801189A (zh) | 2018-01-01 |
US11842901B2 (en) | 2023-12-12 |
US20210035816A1 (en) | 2021-02-04 |
JP2023174725A (ja) | 2023-12-08 |
TWI816261B (zh) | 2023-09-21 |
KR20180116291A (ko) | 2018-10-24 |
JP2021158366A (ja) | 2021-10-07 |
US11404285B2 (en) | 2022-08-02 |
CN108738364B (zh) | 2022-06-28 |
JP2018060995A (ja) | 2018-04-12 |
TW202215550A (zh) | 2022-04-16 |
US20190189466A1 (en) | 2019-06-20 |
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