WO2011125277A1 - 放射線検出器およびそれを製造する方法 - Google Patents
放射線検出器およびそれを製造する方法 Download PDFInfo
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- WO2011125277A1 WO2011125277A1 PCT/JP2011/000953 JP2011000953W WO2011125277A1 WO 2011125277 A1 WO2011125277 A1 WO 2011125277A1 JP 2011000953 W JP2011000953 W JP 2011000953W WO 2011125277 A1 WO2011125277 A1 WO 2011125277A1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0236—Special surface textures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/14636—Interconnect structures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to a radiation detector used in the medical field, the industrial field, the nuclear field, and the like, and a method of manufacturing the same.
- CdTe cadmium telluride
- ZnTe zinc telluride
- CdZnTe cadmium zinc telluride
- the present invention has been made in view of such circumstances, and a radiation detector capable of stabilizing the film quality of a semiconductor layer formed on a substrate and improving the adhesion between the substrate and the semiconductor layer. It is an object to provide a method for manufacturing the same.
- the state of the substrate surface on which the semiconductor layers are stacked is not defined, and it has been unclear what kind of problem occurs depending on the state of the substrate surface. Therefore, focusing on the substrate, it has been found through experiments that the surface roughness of the substrate affects the semiconductor layer.
- the experimental data shown in FIGS. 5 (a) to 5 (c) when a graphite substrate is used as the substrate shows that if the irregularities are large, the crystal growth of the stacked semiconductor layer will be adversely affected, and leakage may occur. If spots are generated and the concavities and convexities are small, the adhesion of the semiconductor layers formed by lamination is poor, and a porous film quality is formed.
- FIG. 5 (a) shows an image observed at x100 magnification by laminating (depositing) a semiconductor layer on a substrate with irregularities (surface roughness) in the range of 1 ⁇ m to 8 ⁇ m.
- FIG. 5B shows an image of ⁇ 100 magnification obtained by forming a semiconductor layer on a substrate having the unevenness of less than 1 ⁇ m
- FIG. 5C shows an image of forming the semiconductor layer on a substrate having the unevenness exceeding 8 ⁇ m.
- a 500 ⁇ image is shown.
- the film forming conditions other than the substrate are all the same, and the difference due to only the surface difference is seen from the image. As can be seen from FIG.
- FIG. 5 (b) it can be seen that the semiconductor layer laminated on the substrate having the unevenness of less than 1 ⁇ m is coarse and porous as compared with FIG. 5 (a).
- FIG. 5C it can be seen that the semiconductor layer laminated on the substrate with the unevenness exceeding 8 ⁇ m has a boundary of the film quality of the semiconductor layer from the upper left to the lower right on the image. Such a boundary is dotted on a substrate having irregularities exceeding 8 ⁇ m, and a leak spot portion where excessive leakage current flows is formed at that portion.
- the radiation detector according to the present invention is a radiation detector for detecting radiation, which converts radiation information into charge information by the incidence of radiation, CdTe (cadmium telluride), ZnTe (zinc telluride) or A polycrystalline semiconductor layer formed of CdZnTe (cadmium zinc telluride), a bias voltage is applied to the semiconductor layer, a graphite substrate for a voltage application electrode also serving as a support substrate, the charge information is read, and the pixel And a readout substrate having a pixel electrode formed in accordance with each, the semiconductor layer is laminated on the graphite substrate, and the semiconductor layer is laminated so that the semiconductor layer and the pixel electrode are bonded to each other inside When the formed graphite substrate and the readout substrate are bonded together to form each, the graphite substrate Unevenness of the surface is characterized in that in the range of 1 [mu] m ⁇ 8 [mu] m.
- a polycrystalline semiconductor layer formed of CdTe, ZnTe, or CdZnTe is used, and a graphite substrate serving as both a voltage application electrode and a support substrate is used as a substrate.
- the irregularities on the surface of the graphite substrate are in the range of 1 ⁇ m to 8 ⁇ m. By setting it within this range, it is possible to prevent the substrate layer having irregularities of less than 1 ⁇ m from being rough and porous, resulting in poor adhesion between the substrate and the semiconductor layer, and conversely, substrates having irregularities exceeding 8 ⁇ m. Let's prevent leak spots. As a result, the film quality of the semiconductor layer stacked on the substrate is stabilized, and the adhesion between the substrate and the semiconductor layer can be improved.
- a radiation detector different from the above-described radiation detector is a radiation detector that detects radiation, and converts radiation information into charge information by the incidence of radiation, and CdTe (cadmium telluride), ZnTe ( A polycrystalline semiconductor layer formed of zinc telluride) or CdZnTe (cadmium zinc telluride), a bias voltage is applied to the semiconductor layer, and a graphite substrate for a voltage application electrode also serving as a support substrate; A pixel electrode formed in accordance with each pixel for reading out information and a readout substrate on which a readout pattern is formed are provided, the semiconductor layer is laminated on the graphite substrate, and the pixel electrode is laminated on the semiconductor layer And a graphite layer in which a semiconductor layer is laminated with the pixel electrode so that the pixel electrode is bonded to the readout substrate side.
- CdTe cadmium telluride
- ZnTe A polycrystalline semiconductor layer formed of zinc telluride
- CdZnTe cadmium zinc
- a polycrystalline semiconductor layer formed of CdTe, ZnTe, or CdZnTe is used, and a graphite substrate serving as both a voltage application electrode and a support substrate is used as a substrate.
- the irregularities on the surface of the graphite substrate are in the range of 1 ⁇ m to 8 ⁇ m. By setting it within this range, it is possible to prevent the substrate layer having irregularities of less than 1 ⁇ m from being rough and porous, resulting in poor adhesion between the substrate and the semiconductor layer, and conversely, substrates having irregularities exceeding 8 ⁇ m. Let's prevent leak spots. As a result, the film quality of the semiconductor layer stacked on the substrate is stabilized, and the adhesion between the substrate and the semiconductor layer can be improved.
- another radiation detector other than the above-described radiation detector is a radiation detector that detects radiation, and converts radiation information into charge information by the incidence of radiation, so that CdTe (cadmium telluride), ZnTe (Zinc Telluride) or CdZnTe (Cadmium Zinc Telluride), a polycrystalline semiconductor layer, a voltage application electrode for applying a bias voltage to the semiconductor layer, and reading out the charge information, depending on the pixel
- the formed pixel electrode, the voltage application electrode, the semiconductor layer, and the pixel electrode are supported, and are formed of any of aluminum oxide, aluminum nitride, boron nitride, silicon oxide, silicon nitride, or silicon carbide, or these materials
- the voltage application electrode is stacked on the support substrate, the semiconductor layer is stacked on the voltage application electrode, the pixel electrode is stacked on the semiconductor layer, and the pixel electrode is
- the unevenness of the surface of the support substrate is in the range of 1 ⁇ m to 8 ⁇ m. It is characterized by this.
- a semiconductor substrate of a polycrystalline film formed of CdTe, ZnTe or CdZnTe, which is supported as a substrate independently of a voltage application electrode, is provided.
- the unevenness of the surface of the support substrate is set in the range of 1 ⁇ m to 8 ⁇ m. By setting it within this range, it is possible to prevent the substrate layer having irregularities of less than 1 ⁇ m from being rough and porous, resulting in poor adhesion between the substrate and the semiconductor layer, and conversely, substrates having irregularities exceeding 8 ⁇ m. Let's prevent leak spots.
- the film quality of the semiconductor layer stacked on the substrate is stabilized, and the adhesion between the substrate and the semiconductor layer can be improved.
- the support substrate is formed of any of aluminum oxide, aluminum nitride, boron nitride, silicon oxide, silicon nitride, or silicon carbide, or formed by firing a mixture of these materials. It only has to be done.
- the voltage application electrode is interposed between the support substrate and the semiconductor layer, but the voltage application electrode is thin, and the unevenness on the surface of the support substrate is transferred to the voltage application electrode, so that the unevenness on the surface of the support substrate is 1 ⁇ m.
- the thickness is in the range of ⁇ 8 ⁇ m, the irregularities on the surface of the voltage application electrode are also in the range, and the effect is almost the same as the structure in which the semiconductor layer is formed on the support substrate.
- the electron blocking layer and the hole blocking layer is formed in direct contact with the semiconductor layer.
- the blocking layer is thin, and irregularities on the surface of the graphite substrate or the supporting substrate are transferred to the blocking layer. Therefore, if the unevenness of the surface of the graphite substrate or the support substrate is in the range of 1 ⁇ m to 8 ⁇ m, the unevenness of the surface of the blocking layer is also almost in this range, and the structure is formed by directly contacting the semiconductor layer with the graphite substrate or the support substrate. Has almost the same effect.
- the surface of the substrate is subjected to surface treatment using any one of milling, polishing, blasting, or etching for the irregularities on the surface of the substrate.
- the unevenness of the surface of the substrate is in the range of 1 ⁇ m to 8 ⁇ m, so that the semiconductor layer stacked on the substrate can be formed.
- the film quality is stable and the adhesion between the substrate and the semiconductor layer can be improved.
- FIG. 3 is a longitudinal sectional view showing a configuration of a radiation detector according to Example 1 on a graphite substrate side.
- FIG. FIG. 3 is a longitudinal sectional view showing a configuration on the readout substrate side of the radiation detector according to the first embodiment. It is a circuit diagram which shows the structure of a read-out board
- the experimental data when a graphite substrate is used as the substrate (a) is an image obtained by forming a semiconductor layer on the substrate with surface irregularities in the range of 1 ⁇ m to 8 ⁇ m and observing it at ⁇ 100 magnification, (b ) Is a ⁇ 100 magnification image obtained by forming a semiconductor layer on a substrate having the unevenness of less than 1 ⁇ m, and (c) is a ⁇ 500 magnification image obtained by forming a semiconductor layer on the substrate having the unevenness exceeding 8 ⁇ m.
- FIG. 1 It is a longitudinal cross-sectional view when the structure by the side of a graphite substrate and the structure by the side of a reading substrate are bonded together in the radiation detector which concerns on Example 2.
- FIG. It is a longitudinal cross-sectional view when the structure by the side of a support substrate and the structure by the side of a reading substrate are bonded together in the radiation detector which concerns on Example 3.
- FIG. It is a schematic diagram for explaining the transfer of irregularities when a voltage application electrode and an electron blocking layer are interposed between a support substrate and a semiconductor layer.
- FIG. 1 is a longitudinal sectional view showing the configuration of the radiation detector according to the first embodiment on the graphite substrate side
- FIG. 2 is a longitudinal sectional view showing the configuration of the radiation detector according to the first embodiment on the readout substrate side
- FIG. 3 is a circuit diagram showing the configuration of the readout substrate and the peripheral circuit
- FIG. 4 is a longitudinal sectional view when the configuration on the graphite substrate side and the configuration on the readout substrate side according to Example 1 are bonded together. It is.
- the radiation detector is roughly divided into a graphite substrate 11 and a readout substrate 21 as shown in FIGS.
- an electron blocking layer 12, a semiconductor layer 13, and a hole blocking layer 14 are laminated on a graphite substrate 11 in this order.
- the readout substrate 21 has a pixel electrode 22 to be described later, and a capacitor 23, a thin film transistor 24, and the like are patterned (only the readout substrate 21 and the pixel electrode 22 are shown in FIG. 2).
- the graphite substrate 11 corresponds to the graphite substrate in this invention
- the electron blocking layer 12 corresponds to the electron blocking layer in this invention
- the semiconductor layer 13 corresponds to the semiconductor layer in this invention
- the hole blocking layer 14
- the readout substrate 21 corresponds to the readout substrate in the present invention
- the pixel electrode 22 corresponds to the pixel electrode in the present invention.
- the graphite substrate 11 serves both as a support substrate 11a and a voltage application electrode 11b in Example 3 described later. That is, a bias voltage (a bias voltage of ⁇ 0.1 V / ⁇ m to 1 V / ⁇ m in each of Examples 1 to 3) is applied to the semiconductor layer 13 and the graphite substrate 11 serving as a voltage application electrode also serving as the support substrate 11a is used.
- the radiation detector according to the first embodiment is constructed.
- the graphite substrate 11 is made of a conductive carbon graphite plate material, and uses a flat plate material (thickness of about 2 mm) whose firing conditions are adjusted in order to match the thermal expansion coefficient of the semiconductor layer 13.
- the semiconductor layer 13 converts radiation information into charge information (carrier) by the incidence of radiation (for example, X-rays).
- a polycrystalline film formed of CdTe (cadmium telluride), ZnTe (zinc telluride) or CdZnTe (cadmium zinc telluride) is used for the semiconductor layer 13.
- the thermal expansion coefficients of these semiconductor layers 13 are about 5 ppm / deg for CdTe and about 8 ppm / deg for ZnTe, and CdZnTe takes an intermediate value according to the Zn concentration.
- a P-type semiconductor such as ZnTe, Sb 2 S 3 , or Sb 2 Te 3 is used.
- an N-type such as CdS, ZnS, ZnO, or Sb 2 S 3 or Use ultra-high resistance semiconductors. 1 and 4, the hole blocking layer 14 is continuously formed. However, when the film resistance of the hole blocking layer 14 is low, the hole blocking layer 14 may be formed separately corresponding to the pixel electrode 22. When the hole blocking layer 14 is formed separately corresponding to the pixel electrode 22, the alignment of the hole blocking layer 14 and the pixel electrode 22 is performed when the graphite substrate 11 and the readout substrate 21 are bonded together. Is required. If there is no problem in the characteristics of the radiation detector, either or both of the electron blocking layer 12 and the hole blocking layer 14 may be omitted.
- the readout substrate 21 has a conductive material (conductive paste, anisotropic conductive film (ACF), anisotropic) at a location (pixel region) of a capacitance electrode 23 a (see FIG. 4) of the capacitor 23 described later.
- the pixel electrode 22 is formed in the place by bump connection at the time of bonding to the graphite substrate 11 with a conductive paste or the like. As described above, the pixel electrode 22 is formed according to each pixel, and reads the carrier converted by the semiconductor layer 13. As the reading substrate 21, a glass substrate is used.
- the readout substrate 21 has a pattern in which a capacitor 23 as a charge storage capacitor and a thin film transistor 24 as a switching element are divided for each pixel.
- a readout substrate 21 having a size (for example, 1024 ⁇ 1024 pixels) that matches the number of pixels of the two-dimensional radiation detector is used.
- the capacitor electrode 23 a of the capacitor 23 and the gate electrode 24 a of the thin film transistor 24 are stacked on the surface of the readout substrate 21 and covered with the insulating layer 25.
- a reference electrode 23b of the capacitor 23 is stacked on the insulating layer 25 so as to face the capacitor electrode 23a with the insulating layer 25 interposed therebetween, and a source electrode 24b and a drain electrode 24c of the thin film transistor 24 are stacked to form a pixel electrode.
- the insulating layer 26 is covered except for the connection portion 22. Note that the capacitor electrode 23a and the source electrode 24b are electrically connected to each other. As shown in FIG. 4, the capacitor electrode 23a and the source electrode 24b may be integrally formed simultaneously.
- the reference electrode 23b is grounded.
- plasma SiN is used for the insulating layers 25 and 26, for example, plasma SiN is used.
- the gate line 27 is electrically connected to the gate electrode 24a of the thin film transistor 24 shown in FIG. 4, and the data line 28 is electrically connected to the drain electrode 24c of the thin film transistor 24 shown in FIG. Yes.
- the gate line 27 extends in the row direction of each pixel, and the data line 28 extends in the column direction of each pixel.
- the gate line 27 and the data line 28 are orthogonal to each other.
- the capacitor 23, the thin film transistor 24, and the insulating layers 25 and 26 including the gate line 27 and the data line 28 are patterned on the surface of the reading substrate 21 made of a glass substrate using a semiconductor thin film manufacturing technique or a fine processing technique.
- a gate drive circuit 29 and a readout circuit 30 are provided around the readout substrate 21.
- the gate drive circuit 29 is electrically connected to the gate line 27 extending to each row, and sequentially drives the pixels in each row.
- the readout circuit 30 is electrically connected to the data line 28 extending in each column, and reads out the carrier of each pixel through the data line 28.
- the gate drive circuit 29 and the readout circuit 30 are composed of a semiconductor integrated circuit such as silicon, and electrically connect the gate line 27 and the data line 28 via an anisotropic conductive film (ACF) or the like.
- ACF anisotropic conductive film
- Surface treatment is performed so that the unevenness of the surface of the graphite substrate 11 is in the range of 1 ⁇ m to 8 ⁇ m.
- a cleaning process for cleaning the graphite substrate 11 is performed to remove impurities, particles, and the like on the surface of the graphite substrate 11.
- milling that performs cutting by applying rotation may be applied to the graphite substrate 11, or polishing may be applied to the graphite substrate 11.
- blasting may be performed by causing a powder such as carbon dioxide (CO 2 ), glass beans, or alumina (Al 2 O 3 ) to collide with the once flattened graphite substrate 11.
- an etching process may be applied to the graphite substrate 11.
- the surface unevenness of the graphite substrate 11 is subjected to surface treatment using any one of milling, polishing, blasting, or etching, so that the surface unevenness of the graphite substrate 11 is in the range of 1 ⁇ m to 8 ⁇ m. Process.
- an electron blocking layer 12 is formed on the graphite substrate 11 having a surface roughness of 1 ⁇ m to 8 ⁇ m by a sublimation method, a vapor deposition method, a sputtering method, a chemical precipitation method, an electrodeposition method, or the like.
- a semiconductor layer 13 which is a conversion layer is laminated on the electron blocking layer 12 by a sublimation method.
- a ZnTe or CdZnTe film containing zinc (Zn) having a thickness of about 300 ⁇ m and containing about several mol% to several tens mol% for use as an X-ray detector having an energy of several tens keV to several hundreds keV is a semiconductor layer. 13 is formed by proximity sublimation.
- a CdTe film containing no Zn may be formed as the semiconductor layer 13.
- the formation of the semiconductor layer 13 is not limited to the sublimation method, and a MOCVD method or a paste containing CdTe, ZnTe, or CdZnTe is applied to form a polycrystalline semiconductor layer 13 formed of CdTe, ZnTe, or CdZnTe. It may be formed.
- the semiconductor layer 13 is planarized by sand blasting or the like that performs blasting by polishing or spraying an abrasive such as sand.
- a hole blocking layer 14 is laminated on the planarized semiconductor layer 13 by a sublimation method, a vapor deposition method, a sputtering method, a chemical precipitation method, an electrodeposition method, or the like.
- the graphite substrate 11 on which the semiconductor layer 13 is laminated and the readout substrate 21 are bonded so that the semiconductor layer 13 and the pixel electrode 22 are bonded inside.
- bump connection with a conductive material conductive paste, anisotropic conductive film (ACF), anisotropic conductive paste, or the like
- ACF anisotropic conductive film
- the pixel electrode 22 is formed at that location, and the graphite substrate 11 and the readout substrate 21 are bonded together.
- the semiconductor layer 13 is a polycrystalline film formed of CdTe, ZnTe, or CdZnTe, and the voltage application electrode and the support substrate are used as a substrate.
- the unevenness of the surface of the graphite substrate 11 is in the range of 1 ⁇ m to 8 ⁇ m. By setting it in such a range, the graphite substrate 11 having unevenness of less than 1 ⁇ m prevents the semiconductor layer 13 from being coarse and porous, thereby preventing the adhesion between the graphite substrate 11 and the semiconductor layer 13 from being deteriorated.
- the occurrence of a leak spot is prevented.
- the film quality of the semiconductor 13 layer formed on the graphite substrate 11 is stabilized, and the adhesion between the graphite substrate 11 and the semiconductor layer 13 can be improved.
- the semiconductor layer 13 formed on the graphite substrate 11 from the experimental data shown in FIG. 5A as described in the above knowledge. It has been confirmed that the film quality is stable and the adhesion between the graphite substrate 11 and the semiconductor layer 13 can be improved.
- Example 1 the electron blocking layer 12 is formed in direct contact with the semiconductor substrate 13 on the graphite substrate 11 side, and the hole blocking layer 14 is in direct contact with the semiconductor layer 13 on the opposite side to the graphite substrate 11 side. And formed. As a result, the electron blocking layer 12 is interposed between the graphite substrate 11 and the semiconductor layer 13. When the electron blocking layer 12 is interposed between the graphite substrate 11 and the semiconductor layer 13 as in the first embodiment, the blocking layers 12 and 14 are thin. As shown in the schematic diagram of FIG. 11 is transferred to the blocking layer (electron blocking layer 12 in the case of Example 1).
- the blocking layer electron blocking layer
- the irregularities on the surface of 12 are also in the above range, and the effect is almost the same as the structure formed by directly contacting the semiconductor layer 13 with the graphite substrate 11.
- the size is shown larger than the surroundings, but it should be noted that the actual size is small.
- the hole blocking layer 14 is interposed between the graphite substrate 11 and the semiconductor layer 13. Even in this structure, the surface unevenness of the graphite substrate 11 is positive.
- the irregularities on the surface of the graphite substrate 11 are transferred to the hole blocking layer 14 and the irregularities on the surface of the graphite substrate 11 are in the range of 1 ⁇ m to 8 ⁇ m, the irregularities on the surface of the hole blocking layer 14 are also almost in this range, and the semiconductor layer 13 is in direct contact with the graphite substrate 11. The same effect as the structure formed in this way can be obtained.
- the unevenness on the surface of the graphite substrate 11 is subjected to surface treatment using any one of milling, polishing, blasting, or etching, so that the unevenness on the surface of the graphite substrate 11 is 1 ⁇ m to 8 ⁇ m. It is possible to process within the range. Moreover, it is preferable to perform a cleaning process for cleaning the graphite substrate 11 before performing the above-described surface treatment. By removing impurities, particles, and the like on the substrate surface by cleaning, the surface irregularities of the graphite substrate 11 can be easily processed into a range of 1 ⁇ m to 8 ⁇ m.
- FIG. 7 is a longitudinal sectional view of the radiation detector according to the second embodiment when the configuration on the graphite substrate side and the configuration on the readout substrate side are bonded together.
- the readout pattern of the capacitor 23, the thin film transistor 24, and the like is not shown on the readout substrate 11 side, and only the readout substrate 11 and the bumps 22a are illustrated.
- the pixel electrode 15 is not provided on the readout substrate 11 side as in the first embodiment, but the pixel electrode 15 is provided on the graphite substrate 11 side as shown in FIG. It is a point. That is, the electron blocking layer 12, the semiconductor layer 13, and the hole blocking layer 14 are formed in this order on the graphite substrate 11 as in the first embodiment, and the pixel electrode 15 is further formed on the hole blocking layer 14 in the second embodiment. Laminate. When the hole blocking layer 14 is not provided, the pixel electrode 15 is formed in direct contact with the semiconductor layer 13.
- the pixel electrode 15 is not a bump as in the first embodiment, but a conductive material such as ITO, Au, or Pt is used.
- the other materials using the graphite substrate 11, the electron blocking layer 12, the semiconductor layer 13, and the hole blocking layer 14 are the same as those in the first embodiment.
- the electron blocking layer 12 and the hole blocking layer 14 may be omitted.
- the pixel electrode 15 corresponds to the pixel electrode in this invention.
- the readout substrate 21 is patterned with a capacitor 23, a thin film transistor 24, and the like (see FIG. 4), as in the first embodiment.
- the bump 22a is formed at the location (pixel region) of the capacitor electrode 23a (see FIG. 4) of the capacitor 23, and the bump 22a and the pixel electrode 15 are connected, so that the graphite substrate 11 and the readout substrate are connected. 21 and pasted together.
- the graphite substrate 11 and the readout substrate 21 are bonded to each other, it is necessary to align the bump 22a and the pixel electrode 15, but depending on the material forming the pixel electrode 15, the pixel The electrode 15 may function as a barrier layer.
- the surface irregularities on the surface of the graphite substrate 11 are processed by performing surface treatment using any one of milling, polishing, blasting, or etching. Processing in the range of 1 ⁇ m to 8 ⁇ m.
- a cleaning process for cleaning the graphite substrate 11 is performed to remove impurities, particles, and the like on the surface of the graphite substrate 11.
- the electron blocking layer 12, the semiconductor layer 13, and the hole blocking layer 14 are laminated in this order on the graphite substrate 11 whose surface irregularities are defined in the range of 1 ⁇ m to 8 ⁇ m.
- the formation method of the electron blocking layer 12, the semiconductor layer 13, and the hole blocking layer 14 is the same as in the first embodiment.
- the graphite substrate 11 on which the semiconductor layer 13 is laminated together with the pixel electrode 15 and the readout substrate 21 are attached so that the pixel electrode 15 is attached to the readout substrate 21 side.
- the bump 22a is formed at the location of the capacitive electrode 23a (see FIG. 4) at the location not covered with the insulating layer 26 (see FIG. 4), and the bump 22a and the pixel electrode 15 are connected. By doing so, the graphite substrate 11 and the readout substrate 21 are bonded together.
- the semiconductor layer 13 is a polycrystalline film formed of CdTe, ZnTe, or CdZnTe, and the voltage application electrode and the support substrate are used as a substrate.
- the graphite substrate 11 is employed in the second embodiment and the pixel electrode 15 is provided on the graphite substrate 11 side, the surface irregularities of the graphite substrate 11 are in the range of 1 ⁇ m to 8 ⁇ m.
- the film quality of the semiconductor layer 13 formed on the graphite substrate 11 is stabilized, and the graphite substrate 11 and the semiconductor Adhesiveness with the layer 13 can be improved.
- the electron blocking layer 12 is formed in direct contact with the graphite substrate 11 side of the semiconductor layer 13 and the hole blocking layer 14 is formed on the graphite substrate 11 of the semiconductor layer 13.
- the electron blocking layer 12 is interposed between the graphite substrate 11 and the semiconductor layer 13 because it is formed in direct contact with the side opposite to the side.
- the irregularities on the surface of the graphite substrate 11 are transferred to the blocking layer (in the case of Example 2, the electron blocking layer 12). Therefore, the same effect as the structure formed by directly contacting the semiconductor layer 13 with the graphite substrate 11 can be obtained.
- the surface of the graphite substrate 11 is subjected to surface treatment using any one of milling, polishing, blasting, or etching, thereby providing a graphite substrate.
- 11 surface irregularities can be processed in the range of 1 ⁇ m to 8 ⁇ m.
- FIG. 8 is a longitudinal cross-sectional view when the configuration on the support substrate side and the configuration on the readout substrate side are bonded together in the radiation detector according to the third embodiment. Similar to FIG. 7 of the second embodiment described above, in FIG. 8, the readout pattern of the capacitor 23, the thin film transistor 24, and the like is omitted on the readout substrate 11 side, and only the readout substrate 11 and the bump 22a are illustrated.
- the third embodiment does not employ a graphite substrate as a substrate, and as shown in FIG. 8, a support substrate 11a that supports the substrate independently of the voltage application electrode 11b as shown in FIG. It is a point that was adopted.
- the third embodiment does not have a pixel electrode on the readout substrate 11 side as in the first embodiment.
- the pixel electrode 15 is provided on the support substrate 11a side. That is, the voltage application electrode 11b, the electron blocking layer 12, the semiconductor layer 13, the hole blocking layer 14, and the pixel electrode 15 are stacked in this order on the support substrate 11a.
- the support substrate 11a corresponds to the support substrate in this invention
- the voltage application electrode 11b corresponds to the voltage application electrode in this invention.
- a material having a small radiation absorption coefficient is used for the support substrate 11a.
- aluminum oxide, aluminum nitride, boron nitride, silicon oxide, silicon nitride is used.
- silicon carbide or a material formed by firing a mixture of these materials is used.
- a conductive material such as ITO, Au, or Pt is used.
- the other materials using the electron blocking layer 12, the semiconductor layer 13, the hole blocking layer 14 and the pixel electrode 15 are the same as those in the second embodiment.
- either or both of the electron blocking layer 12 and the hole blocking layer 14 may be omitted.
- the readout substrate 21 is patterned with a capacitor 23, a thin film transistor 24, and the like (see FIG. 4), as in the first and second embodiments.
- a bump 22a is formed at a location (pixel area) of the capacitor electrode 23a (see FIG. 4) of the capacitor 23, and the bump 22a and the pixel electrode 15 are connected to each other, thereby supporting the support substrate 11a and the readout substrate. 21 and pasted together.
- the unevenness on the surface of the support substrate 11a is used by any one of milling, polishing, blasting, or etching.
- the unevenness of the surface of the support substrate 11a is processed into a range of 1 ⁇ m to 8 ⁇ m.
- a cleaning process for cleaning the support substrate 11a is performed to remove impurities, particles, and the like on the surface of the support substrate 11a.
- the voltage application electrode 11b, the electron blocking layer 12, the semiconductor layer 13, and the hole blocking layer 14 are laminated in this order on the support substrate 11a having a surface irregularity of 1 ⁇ m to 8 ⁇ m.
- the voltage application electrode 11b is laminated on the support substrate 11a by sputtering or vapor deposition.
- the formation method of the electron blocking layer 12, the semiconductor layer 13, and the hole blocking layer 14 is the same as in the first and second embodiments.
- the support substrate 11a in which the voltage application electrode 11b is laminated together with the pixel electrode 15 and the semiconductor layer 13 and the read substrate 21 are bonded so that the pixel electrode 15 is bonded to the read substrate 21 side.
- the semiconductor layer 13 is a polycrystalline film formed of CdTe, ZnTe, or CdZnTe, and is independent of the voltage application electrode 11b as a substrate.
- the unevenness of the surface of the supporting substrate 11a is in the range of 1 ⁇ m to 8 ⁇ m.
- the film quality of the semiconductor layer 13 stacked on the support substrate 11a is stabilized, and the adhesion between the support substrate 11a and the semiconductor layer 13 is improved. be able to.
- the support substrate 11a is formed of any of aluminum oxide, aluminum nitride, boron nitride, silicon oxide, silicon nitride, or silicon carbide, or these materials. It is sufficient that the mixture is formed by firing. Further, the voltage application electrode 11b is interposed between the support substrate 11a and the semiconductor layer 13, but the voltage application electrode 11b is thin, and the unevenness on the surface of the support substrate 11a is applied as shown in the schematic diagram of FIG.
- the unevenness on the surface of the support substrate 11a is in the range of 1 ⁇ m to 8 ⁇ m because it is transferred to the electrode 11b, the unevenness on the surface of the voltage application electrode 11b is also almost in this range, and the semiconductor layer 13 is laminated on the support substrate 11a.
- the size is shown larger than the surroundings, but it should be noted that the actual size is small.
- the electron blocking layer 12 is formed in direct contact with the semiconductor substrate 13 on the support substrate 11a side, and the hole blocking layer 14 is supported on the semiconductor layer 13. Since it is formed in direct contact with the side opposite to the substrate 11a side, the electron blocking layer 12 is interposed between the supporting substrate 11a and the semiconductor layer 13 in addition to the voltage applying electrode 11b.
- the electron blocking layer 12 is interposed between the support substrate 11a and the semiconductor layer 13
- the unevenness on the surface of the support substrate 11a is transferred to the blocking layer (in the case of the third embodiment, the electron blocking layer 12). Therefore, the same effect as the structure in which the semiconductor layer 13 is formed in direct contact with the support substrate 11a can be obtained.
- the unevenness on the surface of the support substrate 11a is subjected to surface treatment using any one of milling, polishing, blasting, or etching, so that the unevenness on the surface of the support substrate 11a is 1 ⁇ m to 8 ⁇ m. It is possible to process within the range.
- the present invention is not limited to the above embodiment, and can be modified as follows.
- X-rays are taken as an example of radiation, but there is no particular limitation as exemplified by ⁇ -rays, light, etc. as radiation other than X-rays.
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Abstract
Description
すなわち、この発明に係る放射線検出器は、放射線を検出する放射線検出器であって、放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、この半導体層にバイアス電圧を印加し、支持基板を兼用した電圧印加電極用のグラファイト基板と、前記電荷情報を読み出し、画素ごとに応じて形成された画素電極を有した読み出し基板とを備え、前記グラファイト基板に前記半導体層を積層形成し、半導体層と前記画素電極とが内側に貼り合わされるように、半導体層が積層形成されたグラファイト基板と前記読み出し基板とを貼り合わせて、それぞれを構成したときに、前記グラファイト基板の表面の凹凸が1μm~8μmの範囲であることを特徴とするものである。
11a … 支持基板
11b … 電圧印加電極
12 … 電子阻止層
13 … 半導体層
14 … 正孔阻止層
15、22 … 画素電極
21 … 読み出し基板
図1は、実施例1に係る放射線検出器のグラファイト基板側の構成を示す縦断面図であり、図2は、実施例1に係る放射線検出器の読み出し基板側の構成を示す縦断面図であり、図3は、読み出し基板および周辺回路の構成を示す回路図であり、図4は、実施例1に係るグラファイト基板側の構成と読み出し基板側の構成とを貼り合わせたときの縦断面図である。
図7は、実施例2に係る放射線検出器においてグラファイト基板側の構成と読み出し基板側の構成とを貼り合わせたときの縦断面図である。図7では、読み出し基板11側ではコンデンサ23や薄膜トランジスタ24などの読み出しパターンについては図示を省略して、読み出し基板11およびバンプ22aのみ図示する。
図8は、実施例3に係る放射線検出器において支持基板側の構成と読み出し基板側の構成とを貼り合わせたときの縦断面図である。上述した実施例2の図7と同様に、図8では、読み出し基板11側ではコンデンサ23や薄膜トランジスタ24などの読み出しパターンについては図示を省略して、読み出し基板11およびバンプ22aのみ図示する。
Claims (18)
- 放射線を検出する放射線検出器であって、
放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、
この半導体層にバイアス電圧を印加し、支持基板を兼用した電圧印加電極用のグラファイト基板と、
前記電荷情報を読み出し、画素ごとに応じて形成された画素電極を有した読み出し基板と
を備え、
前記グラファイト基板に前記半導体層を積層形成し、
半導体層と前記画素電極とが内側に貼り合わされるように、半導体層が積層形成されたグラファイト基板と前記読み出し基板とを貼り合わせて、
それぞれを構成したときに、前記グラファイト基板の表面の凹凸が1μm~8μmの範囲であることを特徴とする放射線検出器。 - 請求項1に記載の放射線検出器において、
電子阻止層、正孔阻止層の少なくとも一つを前記半導体層に直接に接触して形成することを特徴とする放射線検出器。 - 請求項2に記載の放射線検出器において、
前記グラファイト基板と前記半導体層との間に前記電子阻止層あるいは前記正孔阻止層が介在することを特徴とする放射線検出器。 - 放射線を検出する放射線検出器であって、
放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、
この半導体層にバイアス電圧を印加し、支持基板を兼用した電圧印加電極用のグラファイト基板と、
前記電荷情報を読み出し、画素ごとに応じて形成された画素電極と、
読み出しパターンが形成された読み出し基板と
を備え、
前記グラファイト基板に前記半導体層を積層形成し、
前記半導体層に前記画素電極を積層形成し、
画素電極が前記読み出し基板側に貼り合わされるように、画素電極とともに半導体層が積層形成されたグラファイト基板と前記読み出し基板とを貼り合わせて、
それぞれを構成したときに、前記グラファイト基板の表面の凹凸が1μm~8μmの範囲であることを特徴とする放射線検出器。 - 請求項4に記載の放射線検出器において、
電子阻止層、正孔阻止層の少なくとも一つを前記半導体層に直接に接触して形成することを特徴とする放射線検出器。 - 請求項5に記載の放射線検出器において、
前記グラファイト基板と前記半導体層との間に前記電子阻止層あるいは前記正孔阻止層が介在することを特徴とする放射線検出器。 - 放射線を検出する放射線検出器であって、
放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、
この半導体層にバイアス電圧を印加する電圧印加電極と、
前記電荷情報を読み出し、画素ごとに応じて形成された画素電極と、
前記電圧印加電極、前記半導体層および画素電極を支持し、酸化アルミニウム、窒化アルミニウム、窒化ホウ素、酸化シリコン、窒化シリコンまたは炭化ケイ素のいずれかで形成され、あるいはこれらの材料の混合物を焼成して形成された支持基板と、
読み出しパターンが形成された読み出し基板と
を備え、
前記支持基板に前記電圧印加電極を積層形成し、
前記電圧印加電極に前記半導体層を積層形成し、
前記半導体層に前記画素電極を積層形成し、
画素電極が前記読み出し基板側に貼り合わされるように、画素電極および半導体層とともに電圧印加電極が積層形成された支持基板と前記読み出し基板とを貼り合わせて、
それぞれを構成したときに、前記支持基板の表面の凹凸が1μm~8μmの範囲であることを特徴とする放射線検出器。 - 請求項7に記載の放射線検出器において、
電子阻止層、正孔阻止層の少なくとも一つを前記半導体層に直接に接触して形成することを特徴とする放射線検出器。 - 請求項8に記載の放射線検出器において、
前記支持基板と前記半導体層との間に前記電子阻止層あるいは前記正孔阻止層が介在することを特徴とする放射線検出器。 - 放射線検出器を製造する方法であって、
前記放射線検出器は、
放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、
この半導体層にバイアス電圧を印加し、支持基板を兼用した電圧印加電極用のグラファイト基板と、
前記電荷情報を読み出し、画素ごとに応じて形成された画素電極を有した読み出し基板と
を備え、
前記グラファイト基板に前記半導体層を積層形成し、
半導体層と前記画素電極とが内側に貼り合わされるように、半導体層が積層形成されたグラファイト基板と前記読み出し基板とを貼り合わせて、
それぞれを構成したときに、前記グラファイト基板の表面の凹凸が1μm~8μmの範囲であって、
前記グラファイト基板の表面の凹凸を、フライス加工、研磨加工、ブラスト加工またはエッチング加工のいずれかを用いて表面処理を行うことを特徴とする放射線検出器の製造方法。 - 請求項10に記載の放射線検出器の製造方法において、
電子阻止層、正孔阻止層の少なくとも一つを前記半導体層に直接に接触して形成することを特徴とする放射線検出器の製造方法。 - 請求項10に記載の放射線検出器の製造方法において、
前記表面処理を行う前に、前記グラファイト基板を洗浄する洗浄処理を行うことを特徴とする放射線検出器の製造方法。 - 放射線検出器を製造する方法であって、
前記放射線検出器は、
放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、
この半導体層にバイアス電圧を印加し、支持基板を兼用した電圧印加電極用のグラファイト基板と、
前記電荷情報を読み出し、画素ごとに応じて形成された画素電極と、
読み出しパターンが形成された読み出し基板と
を備え、
前記グラファイト基板に前記半導体層を積層形成し、
前記半導体層に前記画素電極を積層形成し、
画素電極が前記読み出し基板側に貼り合わされるように、画素電極とともに半導体層が積層形成されたグラファイト基板と前記読み出し基板とを貼り合わせて、
それぞれを構成したときに、前記グラファイト基板の表面の凹凸が1μm~8μmの範囲であって、
前記グラファイト基板の表面の凹凸を、フライス加工、研磨加工、ブラスト加工またはエッチング加工のいずれかを用いて表面処理を行うことを特徴とする放射線検出器の製造方法。 - 請求項13に記載の放射線検出器の製造方法において、
電子阻止層、正孔阻止層の少なくとも一つを前記半導体層に直接に接触して形成することを特徴とする放射線検出器の製造方法。 - 請求項13に記載の放射線検出器の製造方法において、
前記表面処理を行う前に、前記グラファイト基板を洗浄する洗浄処理を行うことを特徴とする放射線検出器の製造方法。 - 放射線検出器を製造する方法であって、
前記放射線検出器は、
放射線の入射により放射線の情報を電荷情報に変換し、CdTe(テルル化カドミウム)、ZnTe(テルル化亜鉛)またはCdZnTe(テルル化カドミウム亜鉛)で形成された多結晶膜の半導体層と、
この半導体層にバイアス電圧を印加する電圧印加電極と、
前記電荷情報を読み出し、画素ごとに応じて形成された画素電極と、
前記電圧印加電極、前記半導体層および画素電極を支持し、酸化アルミニウム、窒化アルミニウム、窒化ホウ素、酸化シリコン、窒化シリコンまたは炭化ケイ素のいずれかで形成され、あるいはこれらの材料の混合物を焼成して形成された支持基板と、
読み出しパターンが形成された読み出し基板と
を備え、
前記支持基板に前記電圧印加電極を積層形成し、
前記電圧印加電極に前記半導体層を積層形成し、
前記半導体層に前記画素電極を積層形成し、
画素電極が前記読み出し基板側に貼り合わされるように、画素電極および半導体層とともに電圧印加電極が積層形成された支持基板と前記読み出し基板とを貼り合わせて、
それぞれを構成したときに、前記支持基板の表面の凹凸が1μm~8μmの範囲であって、
前記支持基板の表面の凹凸を、フライス加工、研磨加工、ブラスト加工またはエッチング加工のいずれかを用いて表面処理を行うことを特徴とする放射線検出器の製造方法。 - 請求項16に記載の放射線検出器の製造方法において、
電子阻止層、正孔阻止層の少なくとも一つを前記半導体層に直接に接触して形成することを特徴とする放射線検出器の製造方法。 - 請求項16に記載の放射線検出器の製造方法において、
前記表面処理を行う前に、前記支持基板を洗浄する洗浄処理を行うことを特徴とする放射線検出器の製造方法。
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Also Published As
Publication number | Publication date |
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EP2557597A1 (en) | 2013-02-13 |
CN102859691A (zh) | 2013-01-02 |
EP2557597A4 (en) | 2014-11-26 |
JPWO2011125277A1 (ja) | 2013-07-08 |
US9985150B2 (en) | 2018-05-29 |
JP5423880B2 (ja) | 2014-02-19 |
CN102859691B (zh) | 2015-06-10 |
US20130026468A1 (en) | 2013-01-31 |
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