JPH01165113A - Formation of diffused layer - Google Patents

Formation of diffused layer

Info

Publication number
JPH01165113A
JPH01165113A JP32472987A JP32472987A JPH01165113A JP H01165113 A JPH01165113 A JP H01165113A JP 32472987 A JP32472987 A JP 32472987A JP 32472987 A JP32472987 A JP 32472987A JP H01165113 A JPH01165113 A JP H01165113A
Authority
JP
Japan
Prior art keywords
boron
diffusion layer
nitride film
diffused layer
semiconductor substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP32472987A
Other languages
Japanese (ja)
Inventor
Kouki Nonaka
野中 功樹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP32472987A priority Critical patent/JPH01165113A/en
Publication of JPH01165113A publication Critical patent/JPH01165113A/en
Pending legal-status Critical Current

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  • Formation Of Insulating Films (AREA)

Abstract

PURPOSE:To form a shallow highly concentrated, boron-diffused layer in a refined integrated circuit, by forming a diffused layer in a semiconductor substrate in such a way that a boron nitride film is heat-treated by a short-time anneal process after depositing the above nitride film on the semiconductor substrate with vapor phase epitaxy. CONSTITUTION:A boron nitride film 12 is deposited on an Si substrate 11 with vapor phase epitaxy. A short-time annealing is performed by using a lamp annealer and boron it thermally diffused from the boron nitride film 12 and then, a highly concentrated and extremely shallow boron diffused layer 13 can be formed in the semiconductor silicon substrate 11.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は微細化された半導体装置の製造方法のうち、
ボロン拡散層を形成する方法に関するものである。
[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a method for manufacturing a miniaturized semiconductor device.
The present invention relates to a method of forming a boron diffusion layer.

〔発明の概要〕[Summary of the invention]

この発明は半導体基板中にボロン拡散層を形成する方法
において、半導体基板上表面にシラン、アンモニア、窒
素系を用いて気相成長法によりボロンナイトライド膜を
堆積した後、ランプアニール法などの短時間アニール法
により熱処理を行うことにより、半導体基板中にボロン
拡散層を形成するものである。
This invention relates to a method for forming a boron diffusion layer in a semiconductor substrate, in which a boron nitride film is deposited on the upper surface of the semiconductor substrate by vapor phase growth using silane, ammonia, and nitrogen, and then a short process such as lamp annealing is performed. A boron diffusion layer is formed in a semiconductor substrate by performing heat treatment using a time annealing method.

〔従来の技術〕[Conventional technology]

従来、集積回路において半導体基板中にボロン拡散層を
形成する方法として、イオン打ち込みによりボロンイオ
ンを半導体基[21中に打ち込んでボロン打ち込み層2
2を設けた後、熱処理により活性化を行いボロン拡散層
23を得る方法が行われている。(第2図) 〔発明が解決しようとする問題点〕 しかし従来のボロン拡散層形成法では、素子が微細化さ
れ、0.2μm程度以下の浅い拡散層の形成が必要とな
るに従い、以下の問題が生じてきた。
Conventionally, as a method for forming a boron diffusion layer in a semiconductor substrate in an integrated circuit, boron ions are implanted into a semiconductor substrate [21] to form a boron implanted layer 2.
2 is provided, and then activated by heat treatment to obtain the boron diffusion layer 23. (Figure 2) [Problems to be solved by the invention] However, in the conventional boron diffusion layer formation method, as elements become finer and it becomes necessary to form a shallow diffusion layer of about 0.2 μm or less, the following problems arise. A problem has arisen.

すなわち、ボロンイオンを打ち込む場合、打ち込んだ時
点で、ある程度の深さ方向の分布を持つということであ
る。打ち込みエネルギーを低くすることにより、分布を
浅くすることは可能であるが、ゼロにすることはできな
い、さらに活性化のための熱処理後により、分布がさら
に深くなると同時にボロンの表面濃度が低下する。特に
ボロンは熱元素であるために投影飛程、熱拡散係数が大
きく、このような影響が大きいために、低い層抵抗で、
0.2μm程度以下の浅い拡散層を形成するのは、非常
に困難であるという問題点があった。
In other words, when boron ions are implanted, they have a certain degree of distribution in the depth direction at the time of implantation. Although it is possible to make the distribution shallow by lowering the implantation energy, it cannot be reduced to zero.Furthermore, after heat treatment for activation, the distribution becomes deeper and at the same time the surface concentration of boron decreases. In particular, boron is a thermal element and has a large projected range and thermal diffusion coefficient.
There has been a problem in that it is extremely difficult to form a shallow diffusion layer of about 0.2 μm or less.

〔問題点を解決するための手段〕[Means for solving problems]

上記問題点を解決するために本発明は、半導体基板表面
上にシラン、アンモニア、窒素系を用いて、気相成長法
によりボロンナイトライド膜を堆積した後、ランプアニ
ーラ−を用いて短時間アニールを行うことにより、半導
体基板中にボロン拡散層を形成した。
In order to solve the above problems, the present invention deposits a boron nitride film on the surface of a semiconductor substrate by vapor phase growth using silane, ammonia, and nitrogen, and then performs short-time annealing using a lamp annealer. By doing so, a boron diffusion layer was formed in the semiconductor substrate.

〔作用〕[Effect]

シラン、アンモニア、窒素系を用いて、気相成長法によ
り堆積したボロンナイトライド膜中には、1立方センチ
メートル当たり、1022原子以上のボロンが含まれて
いるためにボロンの高濃度の拡散源として用いることが
できる。ボロン拡散層の形成は、ランプアニーラ−によ
る短時間アニールで行うために、ボロンの熱拡散距離を
短く抑えることができる。このようにして、ボロンの表
面濃度が、はぼ固溶限に保たれたままで、拡散層深さが
0.2μm程度以下の高濃度で浅いボロン拡散層の形成
が可能である。
The boron nitride film deposited by vapor phase growth using silane, ammonia, and nitrogen contains 1022 or more atoms of boron per cubic centimeter, so it is used as a high concentration boron diffusion source. be able to. Since the boron diffusion layer is formed by short-time annealing using a lamp annealer, the thermal diffusion distance of boron can be kept short. In this way, it is possible to form a shallow, high-concentration boron diffusion layer with a diffusion layer depth of about 0.2 μm or less, while keeping the surface concentration of boron close to the solid solubility limit.

〔実施例〕〔Example〕

第1図は本発明の拡散層の形成方法の工程を表す断面図
である。第1図(a)において11は半導体シリコン基
板を表す。第1図中)において12はボロンの拡散源と
して用いられるボロンナイトライド膜が気相成長法によ
り堆積された様子を表している。
FIG. 1 is a cross-sectional view showing the steps of the method for forming a diffusion layer of the present invention. In FIG. 1(a), 11 represents a semiconductor silicon substrate. In FIG. 1), reference numeral 12 represents a state in which a boron nitride film used as a boron diffusion source was deposited by vapor phase growth.

第1図(C1において13は、CVDBN膜からボロン
が熱拡散し、半導体シリコン基板中に高濃度のボロン拡
散層が形成された様子を表している。ランプアニーラ−
を用いて短時間アニールを行っているために、0.2μ
m程度以下の非常に浅い拡散層の形成が可能である。
Figure 1 (13 in C1 represents the state in which boron is thermally diffused from the CVDBN film and a highly concentrated boron diffusion layer is formed in the semiconductor silicon substrate. Lamp annealer)
Because the annealing was performed for a short time using
It is possible to form a very shallow diffusion layer of about m or less.

〔発明の効果〕〔Effect of the invention〕

以上、詳細に説明したように、本発明による拡散層の形
成方法は、微細化された集積回路において、高濃度で浅
いボロン拡散層の形成を可能にする優れた特長を有する
As described above in detail, the method for forming a diffusion layer according to the present invention has an excellent feature that enables formation of a shallow boron diffusion layer with high concentration in a miniaturized integrated circuit.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図(a)、 (b)、 (C)は本発明の拡散層の
形成方法の工程順を示す断面図である。 第2図Tag、 (b)は従来技術の拡散層の形成方法
の工程順を示す断面図である。 11・・・半導体シリコン基板 12・・・CVDBN膜 13・・・ボロン拡散層 21・・・半導体シリコン基板 22・・・ボロン打ち込み層 23・・・ボロン拡散層 以上 出願人 セイコー電子工業株式会社 ↓ ↓ ↓ 第2図 手続補正書(自船
FIGS. 1(a), 1(b), and 1(C) are cross-sectional views showing the order of steps in the method for forming a diffusion layer of the present invention. FIG. 2B is a cross-sectional view showing the process order of a conventional method for forming a diffusion layer. 11...Semiconductor silicon substrate 12...CVDBN film 13...Boron diffusion layer 21...Semiconductor silicon substrate 22...Boron implantation layer 23...Boron diffusion layer and above Applicant Seiko Electronics Industries, Ltd.↓ ↓ ↓ Figure 2 Procedure Amendment (own ship

Claims (1)

【特許請求の範囲】[Claims]  気相成長法により半導体基板上にボロンナイトライド
膜を堆積した後、短時間アニール法により熱処理するこ
とにより半導体基板中に拡散層を形成することを特徴と
する拡散層の形成方法。
A method for forming a diffusion layer, which comprises depositing a boron nitride film on a semiconductor substrate by a vapor phase growth method, and then heat-treating the film by a short-time annealing method to form a diffusion layer in the semiconductor substrate.
JP32472987A 1987-12-21 1987-12-21 Formation of diffused layer Pending JPH01165113A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32472987A JPH01165113A (en) 1987-12-21 1987-12-21 Formation of diffused layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32472987A JPH01165113A (en) 1987-12-21 1987-12-21 Formation of diffused layer

Publications (1)

Publication Number Publication Date
JPH01165113A true JPH01165113A (en) 1989-06-29

Family

ID=18169050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32472987A Pending JPH01165113A (en) 1987-12-21 1987-12-21 Formation of diffused layer

Country Status (1)

Country Link
JP (1) JPH01165113A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014513416A (en) * 2011-03-31 2014-05-29 東京エレクトロン株式会社 Method for forming ultra shallow doping region by solid phase diffusion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014513416A (en) * 2011-03-31 2014-05-29 東京エレクトロン株式会社 Method for forming ultra shallow doping region by solid phase diffusion

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