JPS6394691A - Surface luminous led element and its manufacture - Google Patents

Surface luminous led element and its manufacture

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Publication number
JPS6394691A
JPS6394691A JP61239213A JP23921386A JPS6394691A JP S6394691 A JPS6394691 A JP S6394691A JP 61239213 A JP61239213 A JP 61239213A JP 23921386 A JP23921386 A JP 23921386A JP S6394691 A JPS6394691 A JP S6394691A
Authority
JP
Japan
Prior art keywords
layer
inp
type
conductivity type
ingaasp
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
JP61239213A
Other languages
Japanese (ja)
Inventor
Takashi Tsubota
孝志 坪田
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP61239213A priority Critical patent/JPS6394691A/en
Publication of JPS6394691A publication Critical patent/JPS6394691A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain an element with etching-controllability and less scattering in its element characteristics and its life, by forming an InGaAsP layer on a InP substrate before forming an InP block layer for current narrowing on the InP substrate, and by forming the InP block layer so as to interpose this InGaAsP layer. CONSTITUTION:A p-type InGaAsP layer 22 and a n-type InP block layer 23 are serially formed on the first surface of a p-type InP substrate 21. An opening part 25 for current conduction is formed on a resist 24 coating the InP block layer 23. While etching is performed by using the resist 24 as a mask, a p-type InP clad layer 27, a p-type InGaAsP active layer 28, a n type InP clad layer 29, and a n-type InGaAsP layer 30 are formed serially on the InP block layer 23. Thereafter, a resist pattern 31 is formed on the second surface of the InP substrate 21 and a AuZn evaporative film 32 is formed as a P-side electrode all over the second surface. A window 33 for light drawing is formed in the AuZn evaporative film by a liftoff method, and an AuGeNi evaporative film 34 is formed on the surface of the n-type InGaAsP layer 30.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、短距離光通信用、例え+f L A N(
1ocal area network)などの通信用
光源として用(Xられろ面発光LED素子およびその製
造方ン去シこ関するものである。
[Detailed Description of the Invention] (Industrial Application Field) This invention is for short-distance optical communication, for example +f L A N (
This invention relates to a side-emitting LED element for use as a light source for communications such as local area networks and its manufacturing method.

(従来の技術) 従来の上記のような面発光LED素子を第2図に示し、
(a)は平面図、(b)は断面図である。これらの図に
おいて、1はp型InP基板、2はn型InPブロック
層、3はこのブロックNI2に開けられた電流導通用の
穴、4はp型InPクラッド層、5はp型1 nG a
As P活性層、6はn型InPクラッド層、7はn型
1nGaAsPPJ、 8はAuGeNi蒸着膜、9は
AuZn蒸着膜、10はこの蒸着膜9に開けられた光取
出し用の窓である。
(Prior Art) A conventional surface-emitting LED element as described above is shown in FIG.
(a) is a plan view, and (b) is a sectional view. In these figures, 1 is a p-type InP substrate, 2 is an n-type InP block layer, 3 is a hole for current conduction made in this block NI2, 4 is a p-type InP cladding layer, and 5 is a p-type 1 nGa
6 is an n-type InP cladding layer, 7 is an n-type 1nGaAsPPJ, 8 is an AuGeNi vapor deposited film, 9 is an AuZn vapor deposited film, and 10 is a window opened in the vapor deposited film 9 for light extraction.

このようなLED素子は2回のLPE成長(液相エピタ
キシャル成長)により形成される。まず、1回目のLP
E成長によりp型InP基板1上に電流狭さくのための
n型InPブロツク752を厚さ約1μmに成長させる
。次に、このブロック層2に電流導通のための直径40
μmの円形の穴3を塩酸系のエツチング液で形成する。
Such an LED element is formed by two LPE growths (liquid phase epitaxial growth). First, the first LP
An n-type InP block 752 for current confinement is grown to a thickness of about 1 μm on the p-type InP substrate 1 by E growth. Next, this block layer 2 has a diameter of 40 mm for current conduction.
A circular hole 3 with a diameter of μm is formed using a hydrochloric acid-based etching solution.

この後、2回目のLPE成長を行い、厚さ約1μmのp
型InPクラッド層4、厚さ約0.5 pmのp型1n
GaAsP活性層5、厚さ杓1μmのn型InPクラッ
ド層6、オーミックコンタクトのための厚さ約05μm
のn型InGaAsP層7のダブルへテロ構造を形成す
る。その後、このダブルへテロ構造と反対側の前記基板
1面にp側電極としてAuZn蒸着膜9を形成する。他
方、前記オーミックコンタクトのためのn型InGaA
sP層7上にn6Il電橿としてAuGeNi蒸着膜8
を形成し、その後、前記AuZn蒸着膜9に光取出しの
ための直径約80μmの窓10をリフトオフにより形成
する。
After this, a second LPE growth was performed to obtain a plating layer with a thickness of approximately 1 μm.
Type InP cladding layer 4, p-type 1n with a thickness of about 0.5 pm
GaAsP active layer 5, n-type InP cladding layer 6 with a thickness of 1 μm, and a thickness of about 0.5 μm for ohmic contact.
A double heterostructure of n-type InGaAsP layer 7 is formed. Thereafter, an AuZn vapor deposited film 9 is formed as a p-side electrode on the surface of the substrate 1 opposite to this double heterostructure. On the other hand, n-type InGaA for the ohmic contact
An AuGeNi vapor deposited film 8 is formed as an n6Il layer on the sP layer 7.
Then, a window 10 having a diameter of about 80 μm for light extraction is formed in the AuZn vapor-deposited film 9 by lift-off.

このようにして形成されたLED素子は、通電すること
により、p型InP基板1側から光を取出すことができ
る。
The LED element formed in this manner can extract light from the p-type InP substrate 1 side by energizing it.

(発明が解決しようとする問題点) しかしながら、上記のような従来の面発光LED素子お
よびその製造方法では、電流狭さくのためのn型InP
ブロック層2をエツチングして電流導通用の穴3を開け
る際、エツチング終了点の確認ができないため、1型I
nPブロック層2がエツチングされ終った後にp型In
P基板1がエツチングされてしまう問題点があった。こ
の時、基板1がエツチングされる深さをコントロールす
ることは難しい。そして、基板1がエツチングされてし
まうと、第2回目のLPE成長時に、p型1nGaAs
P活性層5の形状は、そのエツチングのされがたに左右
されてしまい、その結果として活性層形状がバラツクと
、光電変換効率のバラツキ、寿命のバラツキなどが発生
する。
(Problems to be Solved by the Invention) However, in the conventional surface emitting LED element and its manufacturing method as described above, n-type InP for current narrowing is used.
When etching the block layer 2 to make holes 3 for current conduction, it is not possible to confirm the end point of the etching.
After the nP block layer 2 is etched, the p-type In
There was a problem that the P substrate 1 was etched. At this time, it is difficult to control the depth to which the substrate 1 is etched. If the substrate 1 is etched, p-type 1nGaAs is grown during the second LPE growth.
The shape of the P active layer 5 depends on the etching process, resulting in variations in the shape of the active layer, variations in photoelectric conversion efficiency, and variations in life.

この発明は以上述べた、InP基板がエツチングされて
しまい、活性層の形状コントロールができない点と、そ
れにより素子特性、寿命がバラツクという問題点を除去
し、エツチングコントロールができて素子特性、寿命の
バラツキの少ない素子を得ることができろ面発光LED
素子およびその製造方法を提供することを目的とする。
This invention eliminates the above-mentioned problem that the InP substrate is etched, making it impossible to control the shape of the active layer, and that the device characteristics and lifespan vary. Surface-emitting LED that allows you to obtain elements with less variation
The object of the present invention is to provide an element and a method for manufacturing the same.

(問題点を解決するための手段) この発明ではInP基板上に電流狭さく用のInPブロ
ック層を形成する前に、1 nGaAsP PiをIn
P基板に形成し、このInGaAsPFJを挾んで前記
InPブロック層を形成する。
(Means for Solving the Problems) In the present invention, before forming an InP blocking layer for current confinement on an InP substrate, 1 nGaAsP Pi is
The InP block layer is formed on a P substrate, and the InP block layer is sandwiched between the InGaAs PFJ.

(作 用) 塩酸系のエツチング液を用いた場合、InPIFJはエ
ツチングされるが、InGaAsP層はエツチングされ
ず、選択エツチングが可能となる。したがって、上記I
nP基板とInPブロック層の間にInGaAsP層が
介在される構成において、InPブロック層に電流導通
のための穴を塩酸系のエツチング液を用いて開けると、
InPブロック層のエツチングが終了した時点でInG
aAsPl15が現われてエツチングに対してストッパ
の役目を果し、それ以上エツチングが進まないようにな
る。すなわち、InP基板はエツチングされなくなる。
(Function) When a hydrochloric acid-based etching solution is used, InPIFJ is etched, but the InGaAsP layer is not etched, allowing selective etching. Therefore, the above I
In a structure in which an InGaAsP layer is interposed between an nP substrate and an InP block layer, if a hole for current conduction is made in the InP block layer using a hydrochloric acid-based etching solution,
When the etching of the InP block layer is completed, the InG
The aAsPl 15 appears and acts as a stopper for etching, preventing further etching. That is, the InP substrate is no longer etched.

(実施例) 以下この発明の一実施例を図面を参照して説明する。第
1図はこの発明の一実施例を示す工程断面図である。
(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a process sectional view showing an embodiment of the present invention.

この図の(alに示すように、まず、例えば1×101
7〜I X 10 ””/cdの濃度を有するp型In
P基板21の第1表面(図では下面)に、1回目のLP
E成長法によって、例久ばlXl0”〜1×1018°
″/dの濃度の厚さ0.5 μrn 、 Eg =1.
03 eV (7) p型1 nGa人sP層22と、
例えばlX1017〜lXl0”/dの濃度の厚さ1μ
爪のn型InPブロック層23を連続して形成する。そ
して、InPブロック層2層化3レジスト24をコーテ
ィングし、このレジスト24には、電流通電用の穴(例
えば40〜70μmφ)を開けるための開口部25を通
常のホトリソ工程で形成する。
As shown in (al) of this figure, first, for example, 1 × 101
p-type In with a concentration of 7 to I x 10""/cd
The first LP is applied to the first surface (lower surface in the figure) of the P substrate 21.
By the E growth method, it is usually lXl0”~1×1018°
″/d concentration thickness 0.5 μrn, Eg =1.
03 eV (7) p-type 1 nGa layer 22,
For example, a thickness of 1μ with a concentration of lX1017 to lXl0"/d
The n-type InP block layer 23 of the nail is continuously formed. Then, a two-layer InP block layer 3 resist 24 is coated, and an opening 25 for making a hole (for example, 40 to 70 μmφ) for current flow is formed in this resist 24 by a normal photolithography process.

次に、HCl系のエツチング液で前記レジスト24をマ
スクとしてInPブロック層2層化310秒程度エツチ
ングすることにより、該InPブロック層23に第1図
(b)に示すように電流通電用の穴26を形成する。こ
の時、InGaAsP層22がエツチングのストッパと
なるので、InPブロック層2層化3ツチングされ終っ
た後にInP基板21がエツチングされることはない。
Next, by etching the two InP block layers for about 310 seconds using the resist 24 as a mask using an HCl-based etching solution, holes for current flow are formed in the InP block layer 23 as shown in FIG. 1(b). Form 26. At this time, since the InGaAsP layer 22 serves as an etching stopper, the InP substrate 21 will not be etched after the two-layered InP block layer is etched.

その後、レジスト24を剥離する。After that, the resist 24 is peeled off.

次に、第2回目のLPE成長により、第1図(C)に示
すように、前記穴26部を含むInPプロ、り層23上
に、例えばI X 1017〜I X 1018”/c
dの濃度の厚さ約1μmのp型InPクラッド層27、
例えば5X1017〜1×10″8″/dの濃度の厚さ
約05μm 、 Eg =0.95 eVのp型1nG
aAsP活性層28、厚さ約1μmのn型InPクラッ
ド層29、オーミックコンタクトのための厚さ約05μ
mのn型InGaAsP層(コンタクト層)30を連続
して形成する。
Next, by the second LPE growth, as shown in FIG. 1(C), for example, I X 1017 to I
a p-type InP cladding layer 27 with a thickness of about 1 μm and a concentration of d;
For example, a p-type 1 nG with a thickness of about 05 μm and Eg = 0.95 eV with a concentration of 5×1017 to 1×10″8″/d.
aAsP active layer 28, n-type InP cladding layer 29 about 1 μm thick, about 05 μm thick for ohmic contact
m n-type InGaAsP layers (contact layers) 30 are successively formed.

しかる後、InP基板21の第2表面(図では上面)の
光取出し窓(直径約80μm)となる部分に第1図(d
lに示すようにレジストパターン31を形成し、さらに
そのレジストパターン31を覆って前記第2表面金体に
、p側電極としてのA u Z n蒸着膜32を真空蒸
着法にて形成する。そして、前記レジストパターン31
を除去し、同時にその上のAuZn蒸着vA32を除去
することにより、つまり、リフトオフ法によって、第1
図te+に示すように、A u Z n蒸着膜(p側電
極)に光取出し用の窓33を形成する。
After that, the second surface (upper surface in the figure) of the InP substrate 21 is provided with a light extraction window (approximately 80 μm in diameter) as shown in FIG.
As shown in FIG. 1, a resist pattern 31 is formed, and further, an AuZn vapor deposited film 32 is formed as a p-side electrode on the second surface metal body by vacuum evaporation, covering the resist pattern 31. Then, the resist pattern 31
The first
As shown in FIG. te+, a window 33 for light extraction is formed in the A u Z n vapor-deposited film (p-side electrode).

その後、反対側のコンタクト層としての前記n型InG
aAsP層30の表面に、n側電極としてのAuGaN
i蒸着膜34を前記第1図(elに示すように真空蒸着
法にて形成する。
After that, the n-type InG as the contact layer on the opposite side
AuGaN as an n-side electrode is placed on the surface of the aAsP layer 30.
The deposited film 34 is formed by vacuum deposition as shown in FIG. 1 (el).

しかる後、約450°に全体を数秒さらすことにより、
半導体層と電極金属との間の合金化を完了させる。
After that, by exposing the whole body to about 450° for a few seconds,
Alloying between the semiconductor layer and the electrode metal is completed.

以上により、p型InP基板21の第1表面にp型1n
GaAsP層22が形成され、その上に、穴26を有す
るn型InPブロック層23が形成され、該ブロックr
523上に前記穴26部を含んでp型InPクラッドF
327が形成され、該クラッド層27上にp型1 nG
 aAs P活性層28.n型InPクラッド層29.
n型1 nGaAsP FJ (:l ンタクト層)3
0およびAuGeNi蒸着膜(n側電極)34が順次形
成され、前記InP基板21の第2表面に、窓33を有
するAuZn蒸着膜(p側電極)32が形成された面発
光LED素子が完成する。
As described above, p-type 1n is formed on the first surface of p-type InP substrate 21.
A GaAsP layer 22 is formed, on which an n-type InP block layer 23 having holes 26 is formed, and the block r
P-type InP cladding F including the hole 26 on 523
327 is formed on the cladding layer 27, and p-type 1 nG
aAs P active layer 28. n-type InP cladding layer 29.
n-type 1 nGaAsP FJ (:l contact layer) 3
0 and AuGeNi evaporated film (n-side electrode) 34 are sequentially formed, and a surface-emitting LED element is completed in which an AuZn evaporated film (p-side electrode) 32 having a window 33 is formed on the second surface of the InP substrate 21. .

なお、以上の一実施例において、pとnの導電型はすべ
て逆にすることもできる。
Note that in the above embodiment, the p and n conductivity types can be reversed.

(発明の効果) 以上説明したように、この発明によれば、InP基板上
にInGaAsP層を挾んでInPブロック層を形成し
、該InPブロック層に塩酸系のエツチング液を用いて
電流導通用の穴を形成した際に、前記InGaAsP層
がエツチングのストッパとして働くようにしたので、I
nP基板がエツチングされることがなくなる。その結果
、エツチングされろ深さく穴の深さ)はInPブロック
層の厚さと等しくなり、エツチング深さの制御が容易と
なるもので、したがって、その後形成される活性層形状
の制御が容易となり、素子特性の一つである例えば光電
変換効率を均一にすることが可能となる。また、素子寿
命も均一にすることができ、加又て製造歩留りの向上も
期待することができる。
(Effects of the Invention) As described above, according to the present invention, an InP block layer is formed on an InP substrate by sandwiching an InGaAsP layer, and a hydrochloric acid-based etching solution is used on the InP block layer to form a current conductive layer. When forming the hole, the InGaAsP layer acts as an etching stopper, so the I
The nP substrate will not be etched. As a result, the etched depth (the depth of the hole) becomes equal to the thickness of the InP block layer, making it easy to control the etching depth and, therefore, the shape of the active layer formed thereafter. For example, it becomes possible to make uniform photoelectric conversion efficiency, which is one of the device characteristics. Further, the device life can be made uniform, and an improvement in manufacturing yield can also be expected.

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

第1図はこの発明の面発光LED素子およびその製造方
法の一実施例を説明するための工程断面図、第2図は従
来の面発光LED素子を示す平面図および断面図である
。 21− p型InP基板、22− p型1nGaAsP
Ft。 23− n型InPブロック層、26 穴、27− p
型InPクラッド層、28 ・= p型1nGnAsP
活性層、29− n型InPクラッド層、30− n型
1nGaAsP層、32−AuZn蒸着膜、33・窓、
34−AuGeNi蒸着膜。 平面図 (a) 牟℃釆の面碧肚九LED 素子 第2図 0−リ %++               N−\−N〜つ
!O墳N句偽0−へっ腎
FIG. 1 is a process cross-sectional view for explaining an embodiment of the surface-emitting LED element of the present invention and its manufacturing method, and FIG. 2 is a plan view and a cross-sectional view showing a conventional surface-emitting LED element. 21- p-type InP substrate, 22- p-type 1nGaAsP
Ft. 23- n-type InP block layer, 26 holes, 27- p
Type InP cladding layer, 28 ・=p type 1nGnAsP
Active layer, 29- n-type InP cladding layer, 30- n-type 1nGaAsP layer, 32- AuZn vapor deposited film, 33. window,
34-AuGeNi vapor deposited film. Plan view (a) LED element Figure 2 0-Re%++ N-\-N~tsu! Ofun N phrase false 0-hekki

Claims (2)

【特許請求の範囲】[Claims] (1)(a)第1導電型InP基板と、 (b)このInP基板の第1表面に形成された同一導電
型のInGnAsP層と、 (c)このInGaAsP層上に形成され、電流導通用
の穴を有する第2導電型InPブロック層と、 (d)前記穴部を含んで前記ブロック層上に形成された
第1導電型クラッド層と、 (e)このクラッド層上に順次形成された第1導電型活
性層、第2導電型クラッド層、第 2導電型コンタクト層および第1電極と、 (f)前記InP基板の第2表面に形成され、光取出し
用の窓を有する第2電極とからなる 面発光LED素子。
(1) (a) an InP substrate of a first conductivity type; (b) an InGnAsP layer of the same conductivity type formed on the first surface of this InP substrate; (c) an InGnAsP layer formed on this InGaAsP layer for current conduction. (d) a first conductivity type cladding layer formed on the block layer including the hole; (e) a first conductivity type cladding layer formed on the cladding layer in sequence. a first conductivity type active layer, a second conductivity type cladding layer, a second conductivity type contact layer, and a first electrode; (f) a second electrode formed on the second surface of the InP substrate and having a window for light extraction; A surface emitting LED element consisting of.
(2)(a)第1導電型InP基板の第1表面に1回目
のLPE成長により同一導電型のInGaAsP層およ
び第2導電型のInPブロック層を連続して形成する工
程と、 (b)その後、前記InPブロック層に電流導通用の穴
をエッチング形成する工程と、 (c)その後、前記穴部を含む前記InPブロック層上
に、2回目のLPE成長により、第 1導電型クラッド層、第1導電型活性層、 第2導電型クラッド層および第2導電型コ ンタクト層を連続して形成する工程と、 (d)その後、前記第2導電型コンタクト層上および前
記InP基板の第2表面にそれぞれ電極を形成し、第2
表面の電極には光取出 し用の窓を形成する工程とを具備してなる 面発光LED素子の製造方法。
(2) (a) a step of successively forming an InGaAsP layer of the same conductivity type and an InP block layer of the second conductivity type on the first surface of the first conductivity type InP substrate by first LPE growth; Thereafter, a step of etching and forming a hole for current conduction in the InP block layer; (c) After that, a first conductivity type cladding layer is formed on the InP block layer including the hole by second LPE growth; a step of successively forming a first conductivity type active layer, a second conductivity type cladding layer and a second conductivity type contact layer; (d) thereafter, on the second conductivity type contact layer and on the second surface of the InP substrate; an electrode is formed on each of the second
A method for manufacturing a surface emitting LED element, comprising the step of forming a window for light extraction on a surface electrode.
JP61239213A 1986-10-09 1986-10-09 Surface luminous led element and its manufacture Pending JPS6394691A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61239213A JPS6394691A (en) 1986-10-09 1986-10-09 Surface luminous led element and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61239213A JPS6394691A (en) 1986-10-09 1986-10-09 Surface luminous led element and its manufacture

Publications (1)

Publication Number Publication Date
JPS6394691A true JPS6394691A (en) 1988-04-25

Family

ID=17041426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61239213A Pending JPS6394691A (en) 1986-10-09 1986-10-09 Surface luminous led element and its manufacture

Country Status (1)

Country Link
JP (1) JPS6394691A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5552260A (en) * 1992-11-30 1996-09-03 Minnesota Mining And Manufacturing Company Shoot and run printing materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5552260A (en) * 1992-11-30 1996-09-03 Minnesota Mining And Manufacturing Company Shoot and run printing materials

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