摘要:
An electron filtering layer placed on a photocathode of a UV light detector allows to selectively filter out electrons generated from a photoconversion of long wavelengths. The filter may be tuned by selecting the material and the thickness of the electron filtering layer. By means of the filtering layer, background noise due to visible parts of the spectrum may be efficiently suppressed. Applications of the invention include a solar-blind flame and/or smoke detector.
摘要:
Provided are a photocathode plate capable of stably achieving a high sensitive property, and an electron tube using such a photocathode plate.In a photomultiplier tube 1, an insulating layer 63 is formed between a semiconductor electron emission layer 51 in a photocathode plate 23A, and a first electrode 65 electrically connected to an electron releasing portion 59. This insulating layer 63 permits the photocathode plate 23A to be cleaned by heat cleaning at a high temperature, in a stage before formation of an active layer 61 on an exposed region of the semiconductor electron emission layer 51 in the electron releasing portion 59. This makes it feasible to effectively clean the exposed region of the semiconductor electron emission layer 51 in the electron releasing portion 59 and to stabilize the physical properties of the exposed region. In consequence, a higher sensitive property can be stably achieved in the photocathode plate 23A and in the photomultiplier tube 1 using the photocathode plate 23A.
摘要:
A photoconductive member is provided with increased sensitivity to radiation incident thereupon and with increased photo-yield in response thereto by means of a multi-layered, sandwich-type construction based upon the provision of successive layers of sensitizing material over corresponding successive layers of conducting material. The photoconductive member comprises at least two composite layers formed one above the other on an insulating substrate, each composite layer comprising a first layer of material capable of conducting charge and a second layer of material comprising polar molecules disposed upon the charge-conducting material layer in such a manner that successive layers of polar molecules are adsorbed and retained in an oriented fashion on successive layers of the charge-conducting material. In combination, the alternating layers of charge-conducting material and polar molecules increase photo-yield in response to a given quantum of incident radiation and also increase the range of wavelength of incident radiation to which the photoconductive member is responsive. The sandwich-type construction permits photoconductor sensitivity to be increased as a function of the number of layers of conducting material and polar molecules used to form the photoconductive surface. The multi-layered construction also exhibits reduced sensitivity to the degrading effects of impurities, is adapted to convenient fabrication, and exhibits extended lifetime.
摘要:
A composite photosensitive material of enhanced sensitivity to, and absorption of, incident radiation, wherein an array of particles of an electrically conducting material is embedded in and dispersed through a semiconducting matrix transparent to the wavelengths of interest, the particles having sizes of from about 1 to about 100 nanometers and having volume fractions of at least about 10 percent. The composite material is usable in photosensitive device applications such as detectors, photocells, photodiodes, and vidicons. Sensitivity to infrared radiation is particularly high where the matrix has a dielectric constant of at least about 10. The preferred particle material for enhanced infrared sensitivity is silver or gold, and the preferred matrix is silicon of CuInSe.sub.2.
摘要:
An apparatus is disclosed for the examination and inspection of integrated devices such as integrated circuits. X-rays are transmitted through the integrated device, and are incident on a photoemissive structure that absorbs x-rays and emits electrons. The electrons emitted by the photoemissive structure are shaped by an electron optical system to form a magnified image of the emitted electrons on a detector. This magnified image is then recorded and processed.For some embodiments of the invention, the photoemissive structure is deposited directly onto the integrated device. In some embodiments, the incidence angle of the x-rays is varied to allow internal three-dimensional structures of the integrated device to be determined. In other embodiments, the recorded image is compared with a reference data to enable inspection for manufacturing quality control.
摘要:
Provided are a photocathode plate capable of stably achieving a high sensitive property, and an electron tube using such a photocathode plate. In a photomultiplier tube 1, an insulating layer 63 is formed between a semiconductor electron emission layer 51 in a photocathode plate 23A, and a first electrode 65 electrically connected to an electron releasing portion 59. This insulating layer 63 permits the photocathode plate 23A to be cleaned by heat cleaning at a high temperature, in a stage before formation of an active layer 61 on an exposed region of the semiconductor electron emission layer 51 in the electron releasing portion 59. This makes it feasible to effectively clean the exposed region of the semiconductor electron emission layer 51 in the electron releasing portion 59 and to stabilize the physical properties of the exposed region. In consequence, a higher sensitive property can be stably achieved in the photocathode plate 23A and in the photomultiplier tube 1 using the photocathode plate 23A.
摘要:
An apparatus is disclosed for the examination and inspection of integrated devices such as integrated circuits. X-rays are transmitted through the integrated device, and are incident on a photoemissive structure that absorbs x-rays and emits electrons. The electrons emitted by the photoemissive structure are shaped by an electron optical system to form a magnified image of the emitted electrons on a detector. This magnified image is then recorded and processed. In some embodiments, the integrated device and photoemissive structure are independently mounted and controlled. In other embodiments, the photoemissive device is deposited directly onto the integrated device. In some embodiments, the incidence angle of the x-rays is varied to allow internal three-dimensional structures of the integrated device to be determined. In other embodiments, the recorded image is compared with a reference data to enable inspection for manufacturing quality control.
摘要:
An apparatus is disclosed for the examination and inspection of integrated devices such as integrated circuits. X-rays are transmitted through the integrated device, and are incident on a photoemissive structure that absorbs x-rays and emits electrons. The electrons emitted by the photoemissive structure are shaped by an electron optical system to form a magnified image of the emitted electrons on a detector. This magnified image is then recorded and processed.In some embodiments, the integrated device and photoemissive structure are independently mounted and controlled. In other embodiments, the photoemissive device is deposited directly onto the integrated device.In some embodiments, the incidence angle of the x-rays is varied to allow internal three-dimensional structures of the integrated device to be determined. In other embodiments, the recorded image is compared with a reference data to enable inspection for manufacturing quality control.
摘要:
The input surface of a photocathode consisting of a membrane of p-type silicon is modified to improve it's sensitivity. The p-type concentration is locally increased and the surface is coated with silicon nitride.