JP2014197669A - 光伝導素子、光伝導素子の製造方法、及び、テラヘルツ時間領域分光装置 - Google Patents
光伝導素子、光伝導素子の製造方法、及び、テラヘルツ時間領域分光装置 Download PDFInfo
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Abstract
Description
本発明の第一の実施形態を、図1を参照して説明する。図1(a)は本実施形態の光伝導素子の断面図で、(b)は上面図である。図1は、Si基板1に対してGe(Geを含むバッファ層)2、GaAs(第1の半導体層)3、LT−GaAs(第2の半導体)4がそれぞれ順に結晶成長された基板上に、複数の電極5を設けて製造した光伝導素子を表している。
実施形態2を説明する。本実施形態は、図3に示す様にバッファ層6にSi(1−x)Gex薄膜の組成比xを、Si基板側からGaAs側(第1の半導体層側)に向かう膜成長方向に対して、次第に大きくしたものである。具体的には、組成比xを、Si基板1側からGaAs3側へ向けてx=0からx=1まで連続的に変化させている。Si(1−x)Gex薄膜は例えばモノシラン(SiH4)とモノゲルマン(GeH4)を用いた減圧CVD(化学気相成長)法などにより結晶成長することができる。組成比xはガスの流量比により制御することができ、ガス流量比を連続的に変化させることで組成比xが連続的に変化したSi(1−x)Gex膜を得ることができる。
実施形態3を説明する。本実施形態は、図4に示す様にGaAs3とLT−GaAs4との間に電流バリア層7を挿入したものである。電流バリア層7としては、Al(1−x)GaxAs(0.5≦x≦1)などの化合物半導体を単層で用いた単層膜、もしくはAlxGa(1−x)As(0.5≦x≦1)やGaAsなどの化合物半導体を交互に積層した多層膜などを使用できる。この電流バリア層7はMBE(Molecular Beam Epitaxy)などの技術を使用して結晶成長することができる。
実施形態4は、実施形態1〜3で説明したような光伝導素子を利用したテラヘルツ時間領域分光(THz−TDS;Terahertz Time Domain Spectroscopy)装置に関するものである。
本発明の実施例1を、図6を参照して説明する。図6(a)は本実施例の光伝導素子の断面図で、(b)は上面図である。図6は、Si基板1に対してGe(Ge層)2、GaAs(GaAs層)3、電流バリア層7LT−GaAs(LT−GaAs層)4がそれぞれ順に結晶成長された基板上に、電極5を設けて製造した光伝導素子を表している。
2 Ge
3 GaAs
4 LT−GaAs
5 電極
6 Si(1−x)Gex
7 電流バリア層
8 Asからなる凝集物
80 励起光パルス発生部
81 励起光パルス
82 ビームスプリッタ
83 テラヘルツ波パルス発生部
84 第二次高調波発生部
85 テラヘルツ波パルス
86 サンプル
87 テラヘルツ波パルス検出素子
88 励起光遅延系
89 処理部
90 表示部
Claims (20)
- テラヘルツ波を発生又は検出する光伝導素子であって、
Si基板と、Geを含むバッファ層と、Ga及びAsを含む第1の半導体層と、Ga及びAsを含む第2の半導体層と、電極と、をこの順に備え、
前記第2の半導体層のGa/Asの元素比率は、前記第1の半導体層のGa/Asの元素比率よりも小さい
ことを特徴とする光伝導素子。 - 前記第1の半導体層の厚さは、1um以下である
ことを特徴とする請求項1に記載の光伝導素子。 - 前記第1の半導体層の厚さは、100nm以上1um以下である
ことを特徴とする請求項1に記載の光伝導素子。 - 前記第1の半導体層の厚さは、100nm以上250nm以下である
ことを特徴とする請求項1に記載の光伝導素子。 - 前記第1の半導体層の成長温度は、500℃以上800℃以下である
ことを特徴とする請求項1乃至4のいずれか1項に記載の光伝導素子。 - 前記第1の半導体層のGa/Asの元素比率が、0.9960以上1.004以下である
ことを特徴とする請求項1乃至5のいずれか1項に記載の光伝導素子。 - 前記第2の半導体層が、GaAs、InGaAs、AlGaAs、GaAsP、及びInGaAsPの少なくともいずれかからなる
ことを特徴とする請求項1乃至6のいずれか1項に記載の光伝導素子。 - 前記第2の半導体層の抵抗率は、1000Ω・cm以上10000000Ω・cm以下である
ことを特徴とする請求項1乃至7のいずれか1項に記載の光伝導素子。 - 前記第2の半導体層が、GaAsからなり、
前記第2の半導体層の成長温度は、200℃以上400℃以下である
ことを特徴とする請求項1乃至8のいずれか1項に記載の光伝導素子。 - 前記第2の半導体層が、GaAsからなり、
前記第2の半導体層のGa/Asの元素比率が、0.9960未満である
ことを特徴とする請求項1乃至9のいずれか1項に記載の光伝導素子。 - 前記第2の半導体層が、GaAsからなり、
前記第2の半導体層が、0.1atm%以上3atm%以下の範囲でAsを余剰に含む
ことを特徴とする請求項1乃至10のいずれか1項に記載の光伝導素子。 - 前記バッファ層が、Si(1−x)Gex(0≦x≦1)からなり、
組成比xが、前記Si基板側から前記第1の半導体層側へ向けて次第に大きくなっている
ことを特徴とする請求項1乃至11のいずれか1項に記載の光伝導素子。 - 前記第1の半導体層と前記第2の半導体層との間に、AlxGa(1−x)As(0.5≦x≦1)を含むバリア層を更に備える
ことを特徴とする請求項1乃至12のいずれか1項に記載の光伝導素子。 - 前記バリア層が、AlxGa(1−x)As(0.5≦x≦1)からなる層とGaAsからなる層とを交互に積層した多層膜を有する
ことを特徴とする特徴とする請求項13に記載の光伝導素子。 - 前記バリア層が、AlxGa(1−x)As(0.5≦x≦1)からなる層とInGaPからなる層とを交互に積層した多層膜を有する
ことを特徴とする特徴とする請求項13に記載の光伝導素子。 - 前記電極が、複数の電極を有し、
前記複数の電極が、前記第2の半導体層の上に配置されている
ことを特徴とする特徴とする請求項1乃至15のいずれか1項に記載の光伝導素子。 - テラヘルツ波を発生又は検出する光伝導素子の製造方法であって、
Si基板上に、Geを含むバッファ層と、Ga及びAsを含む第1の半導体層と、Ga及びAsを含む第2の半導体層と、電極と、をこの順に形成する工程を有し、
前記第2の半導体層のGa/Asの元素比率は、前記第1の半導体層のGa/Asの元素比率よりも小さい
ことを特徴とする光伝導素子の製造方法。 - 前記第1の半導体層の成長温度は、500℃以上800℃以下である
ことを特徴とする請求項17に記載の光伝導素子の製造方法。 - 前記第2の半導体層が、GaAsからなり、
前記第2の半導体層の成長温度は、200℃以上400℃以下である
ことを特徴とする請求項17又は18に記載の光伝導素子の製造方法。 - テラヘルツ時間領域分光装置であって、
テラヘルツ波を発生する発生部と、
前記テラヘルツ波を検出する検出部と、を備え、
前記発生部及び前記検出部の少なくともいずれかが、請求項1乃至16のいずれか1項に記載の光伝導素子を有する
ことを特徴とするテラヘルツ時間領域分光装置。
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US14/199,870 US20140252379A1 (en) | 2013-03-08 | 2014-03-06 | Photoconductive antennas, method for producing photoconductive antennas, and terahertz time domain spectroscopy system |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104576785A (zh) * | 2014-12-04 | 2015-04-29 | 中国科学院上海微系统与信息技术研究所 | 一种用于高In组分InGaAs探测器的突变弛豫缓冲层 |
JP2017045802A (ja) * | 2015-08-25 | 2017-03-02 | キヤノン株式会社 | 光伝導素子 |
RU2624612C1 (ru) * | 2016-10-07 | 2017-07-04 | Федеральное государственное бюджетное учреждение науки Институт сверхвысокочастотной полупроводниковой электроники Российской академии наук (ИСВЧПЭ РАН) | Полупроводниковая структура для фотопроводящих антенн |
JP2019039813A (ja) * | 2017-08-25 | 2019-03-14 | パイオニア株式会社 | 電磁波計測装置 |
JP2019532599A (ja) * | 2016-09-07 | 2019-11-07 | フラウンホファー‐ゲゼルシャフト・ツア・フェルデルング・デア・アンゲヴァンテン・フォルシュング・エー・ファウ | テラヘルツトランシーバ |
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GB2546654B (en) * | 2014-10-30 | 2021-06-02 | Mitsubishi Electric Corp | Array antenna apparatus and method for manufacturing the same |
EP3035394A1 (en) | 2014-12-17 | 2016-06-22 | Centre National de la Recherche Scientifique | Photoconductive antenna for terahertz waves, method for producing such photoconductive antenna and terahertz time domain spectroscopy system |
JP6397553B1 (ja) * | 2017-10-25 | 2018-09-26 | 東芝機械株式会社 | 転写装置 |
CN109001834A (zh) * | 2018-06-22 | 2018-12-14 | 天和防务技术(北京)有限公司 | 一种基于主动式太赫兹安检方法 |
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US20030127673A1 (en) * | 2001-11-29 | 2003-07-10 | Picometrix, Inc. | Amplified photoconductive gate |
JP2010225981A (ja) * | 2009-03-25 | 2010-10-07 | Fujitsu Ltd | 光半導体素子、集積素子、光半導体素子の製造方法 |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104576785A (zh) * | 2014-12-04 | 2015-04-29 | 中国科学院上海微系统与信息技术研究所 | 一种用于高In组分InGaAs探测器的突变弛豫缓冲层 |
CN104576785B (zh) * | 2014-12-04 | 2016-08-17 | 中国科学院上海微系统与信息技术研究所 | 一种用于高In组分InGaAs探测器的突变弛豫缓冲层 |
JP2017045802A (ja) * | 2015-08-25 | 2017-03-02 | キヤノン株式会社 | 光伝導素子 |
JP2019532599A (ja) * | 2016-09-07 | 2019-11-07 | フラウンホファー‐ゲゼルシャフト・ツア・フェルデルング・デア・アンゲヴァンテン・フォルシュング・エー・ファウ | テラヘルツトランシーバ |
US11469509B2 (en) | 2016-09-07 | 2022-10-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Terahertz transceivers |
RU2624612C1 (ru) * | 2016-10-07 | 2017-07-04 | Федеральное государственное бюджетное учреждение науки Институт сверхвысокочастотной полупроводниковой электроники Российской академии наук (ИСВЧПЭ РАН) | Полупроводниковая структура для фотопроводящих антенн |
JP2019039813A (ja) * | 2017-08-25 | 2019-03-14 | パイオニア株式会社 | 電磁波計測装置 |
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