摘要:
Disclosed herein is a process for production of a nitride semiconductor device having good characteristic properties (such as light-emitting performance). The process does not thermally deteriorate the active layer while nitride semiconductor layers are being grown on the active layer. The process consists of forming an active layer on a substrate by vapor phase growth at a first growth temperature, and subsequently forming thereon one or more nitride semiconductor layers at a temperature which is lower than said first growth temperature plus 250° C. The process yields a nitride semiconductor device in which the active layer retains its good crystal properties, without nitrogen voids and metallic indium occurring therein due to breakage of In—N bonds.
摘要:
In a selective growth method, growth interruption is performed at the time of selective growth of a crystal layer on a substrate. Even if the thickness distribution of the crystal layer becomes non-uniform at the time of growth of the crystal layer, the non-uniformity of the thickness distribution of the crystal layer can be corrected by inserting the growth interruption. As a result of growth interruption, an etching rate at a thick portion becomes higher than that at a thin portion, to eliminate the difference in thickness between the thick portion and the thin portion, thereby solving the problem associated with degradation of characteristics due to a variation in thickness of the crystal layer, for example, an active layer. The selective growth method is applied to fabrication of a semiconductor light emitting device including an active layer as a crystal layer formed on a crystal layer having a three-dimensional shape by selective growth.
摘要:
Nitride semiconductor devices and methods of producing same are provided. The present invention includes forming a nitride semiconductor layer on a base body of the nitride semiconductor under selective and controlled crystal growth conditions. For example, the crystal growth rate, the supply of crystal growth source material and/or the crystal growth area can be varied over time, thus resulting in a nitride semiconductor device with enhanced properties.
摘要:
An n-type cladding layer, the first guiding layer, an active layer, the second guiding layer, a p-type cladding layer, a backing layer, a contact layer, a superlattice layer and a cap layer are stacked in this order on an n-type substrate. The cap layer comprises p-type ZnTe and has a thickness of less than 10 nm. The contact layer is comprised of p-type ZnSe and the concentration of nitrogen added to the contact layer is in the range of 1 to 2×1018 cm−3. The backing layer comprises p-type ZnSSe mixed crystal and the concentration of nitrogen added to the backing layer is higher than that of the contact layer, in the range of 1 to 3×1018 cm−3. Before the corresponding Group II-VI compound semiconductor layers are grown by the MBE method, the temperature of cells is once increased. The operating voltage of the semiconductor light emitting device can be lowered by increasing the carrier concentrations of the Group II-VI compound semiconductor layers between the p-side electrode and the p-type cladding layer.
摘要翻译:将n型包覆层,第一引导层,有源层,第二引导层,p型覆层,背衬层,接触层,超晶格层和覆盖层依次堆叠在 n型衬底。 盖层包括p型ZnTe,其厚度小于10nm。 接触层由p型ZnSe组成,并且加入到接触层中的氮浓度在1至2×10 18 cm -3的范围内。 背衬层包括p型ZnSSe混合晶体,添加到背衬层中的氮浓度高于接触层的浓度,范围为1至3×10 18 cm -3。 在通过MBE法生长相应的II-VI族化合物半导体层之前,电池的温度一度增加。 通过增加p侧电极和p型覆层之间的II-VI族化合物半导体层的载流子浓度,能够降低半导体发光元件的工作电压。
摘要:
In order to provide a writing instrument in which a writing direction can be visually recognized in a broad range at a visual part of a pen tip and which can surely write to end of writing, the writing instrument is endowed with a constitution in which a pen tip is equipped with a porous member as a writing part and a holding member holding the above porous member and having at least one ink guiding part through which an ink contained in a barrel is provided to a writing part held by the holding member which is a visible part enabling to visually recognize a writing direction, wherein an area ratio of the visible part is 40% or more of the pen tip protruding from a tip part of the writing instrument.
摘要:
A light emitting device includes: one or plural light emitting elements having plural electrodes; a chip-like insulator surrounding the one or plural light emitting elements from a side surface side of the one or plural light emitting elements; and plural terminal electrodes electrically connected one-to-one with the plural electrodes, and having protrusions each protruding from a peripheral edge of the chip-like insulator.
摘要:
According to one embodiment, an image processing apparatus has a storage unit, a display unit, a display control unit, a setting log saving unit, a determination unit, and an updating unit. The storage unit stores default settings. The display unit displays setting contents reflecting the default settings. The display control unit causes the setting contents which are changed in response to an instruction from a user to be displayed on the display unit. The setting log saving unit saves the setting contents of the executed process as setting log information. The determination unit determines whether or not the default settings are to be changed using a plurality of the setting log information. The updating unit, if it is determined that the default settings are to be changed, updates the default settings to default settings determined from the plurality of the setting log information.
摘要:
A GaN-based semiconductor light-emitting element includes a first GaN-based compound semiconductor layer of n-conductivity type, an active layer, a second GaN-based compound semiconductor layer of p-conductivity type, a first electrode electrically connected to the first GaN-based compound semiconductor layer, a second electrode electrically connected to the second GaN-based compound semiconductor layer, an impurity diffusion-preventing layer composed of an undoped GaN-based compound semiconductor, the impurity diffusion-preventing layer preventing a p-type impurity from diffusing into the active layer, and a laminated structure or a third GaN-based compound semiconductor layer of p-conductivity type. The impurity diffusion-preventing layer and the laminated structure or the third GaN-based compound semiconductor layer of p-conductivity type are disposed, between the active layer and the second GaN-based compound semiconductor layer, in that order from the active layer side.
摘要:
A semiconductor light emitting device including an active layer, a compound semiconductor layer on the active layer, a contact layer on the compound semiconductor layer, and an electrode on the contact layer, where the contact layer is substantially the same size as the electrode.
摘要:
A GaN-based semiconductor light-emitting element includes a first GaN-based compound semiconductor layer of n-conductivity type, an active layer, a second GaN-based compound semiconductor layer of p-conductivity type, a first electrode electrically connected to the first GaN-based compound semiconductor layer, a second electrode electrically connected to the second GaN-based compound semiconductor layer, an impurity diffusion-preventing layer composed of an undoped GaN-based compound semiconductor, the impurity diffusion-preventing layer preventing a p-type impurity from diffusing into the active layer, and a laminated structure or a third GaN-based compound semiconductor layer of p-conductivity type. The impurity diffusion-preventing layer and the laminated structure or the third GaN-based compound semiconductor layer of p-conductivity type are disposed, between the active layer and the second GaN-based compound semiconductor layer, in that order from the active layer side.