JP2007049001A - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP2007049001A JP2007049001A JP2005232979A JP2005232979A JP2007049001A JP 2007049001 A JP2007049001 A JP 2007049001A JP 2005232979 A JP2005232979 A JP 2005232979A JP 2005232979 A JP2005232979 A JP 2005232979A JP 2007049001 A JP2007049001 A JP 2007049001A
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- insulating film
- semiconductor device
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
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- H01L21/28202—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation in a nitrogen-containing ambient, e.g. nitride deposition, growth, oxynitridation, NH3 nitridation, N2O oxidation, thermal nitridation, RTN, plasma nitridation, RPN
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- H01L29/4925—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET the conductor material next to the insulator being a silicon layer, e.g. polysilicon doped with boron, phosphorus or nitrogen with a multiple layer structure, e.g. several silicon layers with different crystal structure or grain arrangement
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- H01L29/76—Unipolar devices, e.g. field effect transistors
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- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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Abstract
【解決手段】 半導体基板21と、半導体基板上に設けられ金属および酸素を含むゲート絶縁膜24と、ゲート絶縁膜上に設けられたゲート電極26と、ゲート電極の両側の半導体基板に設けられたソース/ドレイン領域30a、30bと、を備え、ゲート絶縁膜は、添加元素として5族、6族、15族、16族元素のうちから選択された少なくとも1つの元素を0.003at%以上3at%以下の濃度で含んでいる。
【選択図】 図4
Description
本発明の第1実施形態による半導体装置は、半導体基板上に設けられ高誘電体からなるゲート絶縁膜と、このゲート絶縁膜上に設けられたゲート電極と、ゲート電極の両側の上記半導体基板に設けられたソース・ドレイン領域とを備えているMISトランジスタを有している。そして、ゲート絶縁膜は、金属および酸素を備えているとともに添加元素として3at(原子)%以下の濃度の5族、6族、15族、16族から選択された少なくとも1つの元素を含んでいる。以下では、ゲート絶縁膜中に含有される金属としてハフニウム(Hf)、添加元素としてアンチモン(Sb)を例に挙げて説明する。
次に、本発明の第2実施形態による半導体装置を図7に示す。図7は、本実施形態による半導体装置の断面図である。本実施形態による半導体装置は、MISトランジスタを備え、このMISトランジスタのゲート絶縁膜は第1実施形態の半導体装置のゲート絶縁膜と同じ構成となっている。図7に示すように、p型シリコン基板21上に、素子分離のためのシリコン熱酸化膜22が形成されている。シリコン基板表面には、砒素のイオン注入によってn型のソースおよびドレインとなる、浅い拡散層30aおよび深い拡散層30bが形成されている。シリコン基板21の表面には、HfSiSbOxからなるゲート絶縁膜24が形成されている。さらにゲート絶縁膜24上には、多結晶シリコンからなるゲート電極26が形成されている。また、ゲート電極26の側部には例えばシリコン酸化膜からなる側壁28が形成されている。ソース/ドレインの深い拡散層27bの上にはNiSi層26が形成されている。このように構成された本実施形態のMISトランジスタは層間絶縁膜34によって覆われている。
次に、本発明の第3実施形態による半導体装置を図11に示す。図11は本実施形態による半導体装置を示す断面図である。本実施形態の半導体装置は、図7に示す第2実施形態による半導体装置においてポリシリコンからなるゲート電極26を、金属半導体化合物、例えばNiシリサイド(NiSi)からなるゲート電極27に置き換えた構成となっている。
次に、本発明の第4実施形態による半導体装置を図10に示す。本実施形態の半導体装置は、図7に示す第2実施形態の半導体装置において、ゲート絶縁膜24を、HfSiSbOxからなる絶縁膜24aと、HfSiOxからなる絶縁膜24bと、HfSiSbOxからなる絶縁膜24cとからなる3層構造のゲート絶縁膜24に置き換えた構成となっている。
次に、本発明の第5実施形態による半導体装置を図20乃至図24(b)を参照して説明する。
22 素子分離領域
24 ゲート絶縁膜
24a 絶縁膜
24b 絶縁膜
24c 絶縁膜
26 ゲート電極
28 側壁
30a エクステンション層
30b ソース・ドレイン領域
32 シリサイド層
34 層間絶縁膜
Claims (15)
- 半導体基板と、
前記半導体基板上に設けられ金属および酸素を含むゲート絶縁膜と、
前記ゲート絶縁膜上に設けられたゲート電極と、
前記ゲート電極の両側の前記半導体基板に設けられたソース/ドレイン領域と、
を備え、
前記ゲート絶縁膜は、添加元素として5族、6族、15族、16族元素のうちから選択された少なくとも1つの元素を0.003at%以上3at%以下の濃度で含んでいることを特徴とする半導体装置。 - 前記添加元素は、リン、砒素、アンチモン、ビスマスであって、その含有量が0.1at%以上3at%以下であることを特徴とする請求項1記載の半導体装置。
- 前記添加元素は、硫黄、セレン、テルル、バナジウム、ニオブ、タンタル、クロム、モリブデン、タングステンであって、その含有量が0.003at%以上3at%以下であることを特徴とする請求項1記載の半導体装置。
- 前記ゲート絶縁膜は、前記金属元素と前記添加元素との結合を含むことを特徴とする請求項1乃至3のいずれかに記載の半導体装置。
- 前記ゲート絶縁膜は、前記酸素と前記添加元素との結合を含むことを特徴とする請求項1乃至4のいずれかに記載の半導体装置。
- 前記ゲート絶縁膜と前記ゲート電極との間および前記ゲート絶縁膜と前記半導体基板との間のいずれか一方にSi酸化物またはSi酸窒化物かなる絶縁膜を備えていることを特徴とする請求項1乃至5のいずれかに記載の半導体装置。
- 前記添加元素の濃度が、前記ゲート絶縁膜中で低く、前記ゲート絶縁膜と前記ゲート電極との界面および前記ゲート絶縁膜と前記半導体基板との界面のうち少なくとも一方の界面で高くなっていることを特徴とする請求項1乃至6のいずれかに記載の半導体装置。
- 前記金属は、Hf、Zr、Tiおよびランタノイド系元素からなる群から選択される少なくとも1種の元素であることを特徴とする請求項1乃至7のいずれかに記載の半導体装置。
- 半導体基板と、
前記半導体基板上に設けられたゲート絶縁膜と、
前記ゲート絶縁膜上に設けられた第1ゲート電極と、
前記浮遊ゲート電極上に設けられ金属および酸素を含む電極間絶縁膜と、
前記電極間絶縁膜上に設けられた第2ゲート電極と、
前記第1および第2ゲート電極の両側の前記半導体基板に設けられたソース/ドレイン領域と、
を備え、
前記電極間絶縁膜は、添加元素として5族、6族、15族、16族元素のうちから選択された少なくとも1つの元素を0.003at%以上3at%以下の濃度で含んでいることを特徴とする半導体装置。 - 前記添加元素は、リン、砒素、アンチモン、ビスマスであって、その含有量が0.1at%以上3at%以下であることを特徴とする請求項9記載の半導体装置。
- 前記電極間絶縁膜は、前記金属元素と前記添加元素との結合あるいは前記酸素と前記添加元素との結合を含むことを特徴とする請求項9乃至10のいずれかに記載の半導体装置。
- 前記電極間絶縁膜と前記第1ゲート電極との間および前記電極間絶縁膜と前記第2ゲート電極との間のいずれか一方にSi酸化物またはSi酸窒化物かなる絶縁膜を備えていることを特徴とする請求項9乃至11のいずれかに記載の半導体装置。
- 前記添加元素の濃度が、前記電極間絶縁膜中で低く、前記電極間絶縁膜と前記第1ゲート電極との界面および前記電極間絶縁膜と前記第2ゲート電極との界面のうち少なくとも一方の界面で高くなっていることを特徴とする請求項9乃至12のいずれかに記載の半導体装置。
- 半導体基板上に、金属、酸素、および0.003at%以上3at%以下の濃度の5族、6族、15族、16族元素のうちから選択された少なくとも1つの添加元素を含むゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上にゲート電極を形成する工程と、
前記ゲート電極をマスクとして用いて、前記半導体基板の前記素子領域に不純物を導入して、ソース/ドレイン領域を形成する工程と、
を備えていることを特徴とする半導体装置の製造方法。 - 前記添加元素は、リン、砒素、アンチモン、ビスマスであることを特徴とし、その含有量が0.1at%以上3at%以下であることを特徴とする請求項14記載の半導体装置の製造方法。
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JP2010226037A (ja) * | 2009-03-25 | 2010-10-07 | Toshiba Corp | 半導体装置 |
JP2013084959A (ja) * | 2011-10-12 | 2013-05-09 | Asm Internatl Nv | 酸化アンチモン膜の原子層堆積 |
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JP4459257B2 (ja) * | 2007-06-27 | 2010-04-28 | 株式会社東芝 | 半導体装置 |
KR100895854B1 (ko) * | 2007-10-25 | 2009-05-06 | 한양대학교 산학협력단 | 2개의 제어 게이트들을 가지는 플래시 메모리의 제조 방법 |
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