WO2003088368A2 - Ortsempfindliche germaniumdetektoren mit mikrostruktur auf beiden kontaktflächen - Google Patents
Ortsempfindliche germaniumdetektoren mit mikrostruktur auf beiden kontaktflächen Download PDFInfo
- Publication number
- WO2003088368A2 WO2003088368A2 PCT/EP2003/003485 EP0303485W WO03088368A2 WO 2003088368 A2 WO2003088368 A2 WO 2003088368A2 EP 0303485 W EP0303485 W EP 0303485W WO 03088368 A2 WO03088368 A2 WO 03088368A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- amorphous layer
- detector according
- amorphous
- resolving detector
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F30/00—Individual radiation-sensitive semiconductor devices in which radiation controls the flow of current through the devices, e.g. photodetectors
- H10F30/20—Individual radiation-sensitive semiconductor devices in which radiation controls the flow of current through the devices, e.g. photodetectors the devices having potential barriers, e.g. phototransistors
- H10F30/29—Individual radiation-sensitive semiconductor devices in which radiation controls the flow of current through the devices, e.g. photodetectors the devices having potential barriers, e.g. phototransistors the devices being sensitive to radiation having very short wavelengths, e.g. X-rays, gamma-rays or corpuscular radiation
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F77/00—Constructional details of devices covered by this subclass
- H10F77/20—Electrodes
- H10F77/206—Electrodes for devices having potential barriers
Definitions
- the invention relates to a spatially resolving detector for the measurement of charged particles or photons.
- the invention further relates to a tomograph or a Compton camera with such a detector.
- a detector of the type mentioned at the outset is the publication "High Purily Germanium Position-Sensitive Detector for Positron Annihilation Experiments", G, Riepe, D, Proti'c, R, Kurz, W. Trifts Reifen, Zs. Kajcsos and J, Winter, Proceedings 5 * Int. Conf. Positron Annihilation, (Japan, 1979), from which a detector consisting of very pure crystalline germanium is known, which has microstructures on both sides, phosphorus on one side and boron on the other side The implantation was carried out by ion implantation.
- the location-dependent charge represents a measure of the information sought
- contacts doped with boron can be produced very easily by ion implantation.
- Implanting with phosphorus is fundamentally also a technically very simple method, but disadvantageous is the radiation damage that leads to p + doping in a layer that is actually supposed to be an n or n + contact.
- the radiation damage has a correspondingly disruptive effect.
- the n or p layers are provided with structures, the structures can be produced by a lithographic process, lithographic processes belong to the general specialist knowledge.
- a light-sensitive varnish is applied to the surface to be structured using a photophotoiithographic process.
- the light-sensitive varnish is partially exposed through a mask.
- Trenches are then introduced into the surface at the exposed areas of the photoresist using plasma etching.
- the n-layer or p-layer is then structured. This is to be understood to mean that the layer acting as an n- or p-contact is divided into individual segments which are separated from one another by trenches. These separated elements are often referred to in the literature as local elements be removed.
- the structuring can take the form of strips on both sides.
- the strips on one side are then, for example, oriented perpendicularly relative to the strips on the other side. In principle, however, any geometric pattern is possible.
- a spiral structure on both sides has already been planned. The spirals ran in opposite directions, so that spatial resolution was also possible,
- the thickness of the lithium layer which is typically 200 to 1000 ⁇ m deep, it is also disadvantageous that no transmission detectors can be provided.
- Aluminum can be replaced by other metals such as palladium or gold.
- the metal is structured and applied in the form of a strip.
- the amorphous germanium layer is not structured, this is only very slightly conductive, so that the structuring of the metallic surface is sufficient for one to obtain spatially resolving detector.
- the object of the invention is to provide a detector of the type mentioned at the outset with improved accuracy in energy determination and improved energy resolution in measurement.
- the object of the invention is achieved by a spatially resolving detector with the features of the first claim.
- Advantageous refinements result from the subclaims.
- a method for producing the detector results from the subordinate claim,
- the object is achieved by a spatially resolving detector for the measurement of charged particles with a surface area which is formed by an amorphous layer and a structured metallic layer located thereover.
- the structure of the metallic layer is continued into the amorphous layer. According to the invention, it is important that not only the metallic surface but also the amorphous layer located below is structured. The structures match.
- the structure of the metallic layer advantageously extends through the amorphous layer into the crystal structure on which the amorphous layer is applied.
- the measurement accuracy in energy determination is increased compared to the prior art if the structuring extends into the amorphous layer.
- the achievable energy resolution is also significantly improved.
- the improvements are particularly successful if the structure is passed through the amorphous layer and extends into the crystalline structure located underneath. A few ⁇ m depth of the structure in the crystalline area is sufficient.
- the structure should extend into the semiconducting region at least 1 ⁇ m deep, preferably at least 5 ⁇ m deep.
- amorphous layer made of germanium.
- the metallic layer can consist, for example, of aluminum, palladium or gold.
- the crystalline region below the amorphous layer then preferably also consists of germanium,
- the structure is formed by segments which have an offset of less than 200 ⁇ m, in particular a distance of less than 100 ⁇ m, particularly preferably less than 20 ⁇ m.
- the practically realizable lower limit is approx. 1 ⁇ m.
- the desired small structures can be generated, for example, by a photophotolithographic process.
- the amorphous layer is basically applied to a semiconductor material.
- the amorphous layer therefore has an electrical conductivity which is significantly less than the conductivity of the material which is located below the amorphous layer.
- an amorphous germanium layer is first sputtered or vapor-deposited onto crystalline germanium.
- a metal layer is then evaporated, for example an aluminum layer.
- the desired structures are then lithographically produced in a defined manner. Trenches are etched so deeply within the amorphous germanium metal layer that they at least reach the germanium crystal region. These trenches advantageously extend into the geranium crystal.
- the counter contact (p + ) was provided by doping with boron and subsequent microstructuring.
- a three-dimensional location determination ( ⁇ z ⁇ 100 ⁇ m) by individual drift time measurements per segment with time resolutions ⁇ 10 ns FWHM can be carried out; • one. Particle identification by measuring the drift time differences can be carried out.
- the dimensions of a detector are typically 3 inches in diameter.
- the thickness of the detector is typically 10 to 20 mm.
- the effective thickness of the boron layer is regularly below 1 ⁇ m.
- the thickness of the amorphous germanium layer is typically approx. 0.1 ⁇ m thick.
- the metal layer is typically 0.1 to 0.2 ⁇ m thick.
- the depth of the trenches is typically 10 ⁇ m.
- implanted boron regularly extends up to 10 ⁇ m or even up to 20 ⁇ m into the germanium crystal. Etching has also been carried out to this depth.
- the invention differs from the prior art in particular in that the depth of the trench extends much further than would have been necessary for the metal layer or also for the amorphous germanium layer itself to achieve optimal effects,
- a crystal consisting of silicon can be provided,
- the detector is to be used in particular in the medical field, since the detectors previously used do not provide the required spatial resolutions with a high counting rate.
- the spatial resolution can be increased practically indefinitely in the present invention. In terms of magnitude, the spatial resolution can easily be doubled compared to hitherto used in detectors used in medicine while maintaining the remaining performance.
- the spatial resolution in the medical field was previously 2 mm. Spatial resolutions of 1 mm can now be implemented without any problems, in particular in the field of tomography the detector is used to achieve significantly better results.
- Positron emission tomography is another area in the medical field where the detector can be used to advantage.
- SPECT is another application example.
- the detector is then in particular a component of a Compton camera, small animal positron emission tomography is another typical example of use in medicine.
- Another important area of application is astrophysics for the present detector,
- FIG. 1 shows a section through a semiconductor 1 consisting of germanium.
- the semiconductor 1 has a layer 2 on one surface which consists of amorphous germanium. This forms an n + contact.
- Opposite is a layer 3 of the semiconductor, which is doped with boron. This forms a p + contact.
- Metallic layers 4 and 5, which serve for electrical contacting, are applied to layers 2 and 3,
- the metallic layer structured in the form of a strip. Instead, the trenches 5 extend into the amorphous layer 2, so that the latter has individual segments which are separate from one another.
- the p + contact can also be structured in a stripe shape.
- the stripes then generally run perpendicular to the stripes on the side with the amorphous germanium (here, therefore, parallel to the plane of the paper). Therefore no trenches are visible.
- the embodiment according to FIG. 2 is particularly powerful.
- the trenches 5 extend into the semiconductor material
- germanium for example, crystalline or amorphous silicon can be used.
- Ili-V compounds such as GaAs or CdTe are suitable as semi-ceramic materials.
- doping with boron it was found that layer 3 can be replaced by amorphous germanium or else amorphous silicon. Why this works is not physically clear,
- the width of the trenches is between 1 and 200 ⁇ m, so the strips are 1 and 200 ⁇ m apart,
Landscapes
- Measurement Of Radiation (AREA)
- Light Receiving Elements (AREA)
- Pressure Sensors (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003585191A JP4681233B2 (ja) | 2002-04-18 | 2003-04-03 | 荷電粒子測定用の位置分解能を有する検出器、該検出器を備えたトモグラフ又はコンプトンカメラ、及び該検出器の製造方法 |
| DE50310702T DE50310702D1 (de) | 2002-04-18 | 2003-04-03 | Ortsempfindliche germaniumdetektoren mit mikrostruktur auf beiden kontaktflächen |
| US10/511,734 US20050230627A1 (en) | 2002-04-18 | 2003-04-03 | Position-sensitive germanium detectors having a microstructure on both contact surfaces |
| EP03722394A EP1495497B1 (de) | 2002-04-18 | 2003-04-03 | Ortsempfindliche germaniumdetektoren mit mikrostruktur auf beiden kontaktflächen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10217426.1 | 2002-04-18 | ||
| DE10217426A DE10217426B4 (de) | 2002-04-18 | 2002-04-18 | Ortsauflösender Detektor für die Messung elektrisch geladener Teilchen und Verwendung des Detektors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2003088368A2 true WO2003088368A2 (de) | 2003-10-23 |
| WO2003088368A3 WO2003088368A3 (de) | 2004-02-05 |
Family
ID=29224575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2003/003485 Ceased WO2003088368A2 (de) | 2002-04-18 | 2003-04-03 | Ortsempfindliche germaniumdetektoren mit mikrostruktur auf beiden kontaktflächen |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20050230627A1 (de) |
| EP (1) | EP1495497B1 (de) |
| JP (1) | JP4681233B2 (de) |
| AT (1) | ATE412977T1 (de) |
| DE (2) | DE10217426B4 (de) |
| WO (1) | WO2003088368A2 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007031886A3 (en) * | 2005-09-15 | 2007-07-05 | Koninkl Philips Electronics Nv | Improved performance solid state detectors |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2541256A1 (en) * | 2006-02-22 | 2007-08-22 | Redlen Technologies Inc. | Shielding electrode for monolithic radiation detector |
| US8785865B2 (en) | 2008-12-03 | 2014-07-22 | Tohoku University | Semiconductor detector for two-dimensionally detecting radiation positions and method for two-dimensionally detecting radiation positions using the same |
| US8476101B2 (en) * | 2009-12-28 | 2013-07-02 | Redlen Technologies | Method of fabricating patterned CZT and CdTe devices |
| JP2014239152A (ja) | 2013-06-07 | 2014-12-18 | シーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft | 電極層を分断する溝を有する半導体素子及びその溝の形成方法 |
| US9864138B2 (en) | 2015-01-05 | 2018-01-09 | The Research Foundation For The State University Of New York | Integrated photonics including germanium |
| EP3362819A4 (de) * | 2015-10-14 | 2019-06-05 | Shenzhen Xpectvision Technology Co., Ltd. | Röntgendetektoren zur begrenzung der diffusion von ladungsträgern |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS603792B2 (ja) * | 1977-02-04 | 1985-01-30 | 株式会社東芝 | マルチチヤネル型半導体放射線検出器 |
| JPS57154083A (en) * | 1981-03-19 | 1982-09-22 | Yokogawa Hokushin Electric Corp | Ct scanner |
| JPS60124879A (ja) * | 1983-12-08 | 1985-07-03 | Yokogawa Hokushin Electric Corp | 多チャンネル形放射線検出器及びその製造方法 |
| JPH0816702B2 (ja) * | 1983-12-26 | 1996-02-21 | 株式会社島津製作所 | 半導体放射線位置検出装置 |
| JPS61196572A (ja) * | 1985-02-25 | 1986-08-30 | Hitachi Zosen Corp | アモルフアスシリコンx線センサ |
| JPS6412582A (en) * | 1987-07-07 | 1989-01-17 | Matsushita Electric Industrial Co Ltd | Semiconductor radiation detector |
| JPH0221284A (ja) * | 1988-07-08 | 1990-01-24 | Matsushita Electric Ind Co Ltd | 粒子線検出装置 |
| US5164809A (en) * | 1989-04-21 | 1992-11-17 | The Regents Of The University Of Calif. | Amorphous silicon radiation detectors |
| EP0597943A4 (en) * | 1991-07-31 | 1994-07-27 | Univ California | Improvements in particle detector spatial resolution. |
| JP3036258B2 (ja) * | 1992-10-08 | 2000-04-24 | 富士電機株式会社 | 半導体放射線検出器 |
| JPH06260671A (ja) * | 1993-03-09 | 1994-09-16 | Japan Energy Corp | 半導体放射線検出器およびその製造方法 |
| WO1994025878A1 (en) * | 1993-04-28 | 1994-11-10 | University Of Surrey | Radiation detectors |
| FR2757685B1 (fr) * | 1996-12-24 | 1999-05-14 | Commissariat Energie Atomique | Dispositif de detection de rayonnements ionisants a semi-conducteur de haute resistivite |
| US6175120B1 (en) * | 1998-05-08 | 2001-01-16 | The Regents Of The University Of Michigan | High-resolution ionization detector and array of such detectors |
| US6069360A (en) * | 1998-05-08 | 2000-05-30 | Lund; James C. | Method and apparatus for electron-only radiation detectors from semiconductor materials |
| JP2000121738A (ja) * | 1998-10-20 | 2000-04-28 | Hitachi Medical Corp | 半導体放射線検出器 |
| JP2001274450A (ja) * | 2000-03-23 | 2001-10-05 | Fuji Electric Co Ltd | β線検出器 |
-
2002
- 2002-04-18 DE DE10217426A patent/DE10217426B4/de not_active Expired - Fee Related
-
2003
- 2003-04-03 AT AT03722394T patent/ATE412977T1/de active
- 2003-04-03 JP JP2003585191A patent/JP4681233B2/ja not_active Expired - Fee Related
- 2003-04-03 DE DE50310702T patent/DE50310702D1/de not_active Expired - Lifetime
- 2003-04-03 US US10/511,734 patent/US20050230627A1/en not_active Abandoned
- 2003-04-03 EP EP03722394A patent/EP1495497B1/de not_active Expired - Lifetime
- 2003-04-03 WO PCT/EP2003/003485 patent/WO2003088368A2/de not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007031886A3 (en) * | 2005-09-15 | 2007-07-05 | Koninkl Philips Electronics Nv | Improved performance solid state detectors |
| US8039808B2 (en) | 2005-09-15 | 2011-10-18 | Koninklijke Philips Electronics N.V. | Performance solid state detectors |
| CN101263403B (zh) * | 2005-09-15 | 2013-05-08 | 皇家飞利浦电子股份有限公司 | 性能改进的固体探测器 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20050230627A1 (en) | 2005-10-20 |
| JP4681233B2 (ja) | 2011-05-11 |
| EP1495497B1 (de) | 2008-10-29 |
| DE50310702D1 (de) | 2008-12-11 |
| WO2003088368A3 (de) | 2004-02-05 |
| ATE412977T1 (de) | 2008-11-15 |
| DE10217426A1 (de) | 2003-11-13 |
| JP2005523438A (ja) | 2005-08-04 |
| DE10217426B4 (de) | 2006-09-14 |
| EP1495497A2 (de) | 2005-01-12 |
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