摘要:
A surface emitting AlGaInP LED having an ITO layer as a window layer to eliminate the current crowding effect, and an ohmic contact layer between its double hetero-structure of AlGaInP and the ITO layer, so that ITO can be utilized with the double hetero-structure of AlGaInP.
摘要:
A surface emitting AlGaInP LED having an ITO layer as a window layer to eliminate the current crowding effect, and an ohmic contact layer between its double hereto-structure of AlGaInP and the ITO layer, so that ITO can be utilized with the double hereto-structure of AlGaInP.
摘要:
This invention relates to the fabrication of integrated circuit devices and more particularly to a method for reducing the otherwise excessive negative TCR of low doped polysilicon load resistors in sub-micron, NMOS based, 4 transistor SRAM cells. The problem with a high negative TCR is that cell failures can occur as operating currents drop down too close to device leakage currents, when operating at cold temperatures. The key to this invention is a novel PN junction approach which causes polysilicon resistors to become electrically thicker at colder temperatures. A vertical PN junction is formed along the entire length of a polysilicon resistor and the temperature dependent space charge region of the PN junction is used for modulating the effective electrical thickness of the resistor. Consequently, the undesirable tendency for thermally activated grain boundary conduction to decrease with cold temperatures is partially compensated by a slight concurrent increase in resistor thickness. A method is described for fabricating such novel polysilicon load resistors, which can be used for operating 4T SRAMs at temperatures, as low as −45C., while not appreciably adding to process or device complexity.
摘要:
A process for fabricating a flash EEPROM device, incorporating a shallow, heavily doped, source side region, used to improve the endurance of the flash EEPROM device, has been developed. The process features placing a shallow, ion implanted arsenic region, in the semiconductor substrate, adjacent to one side of a floating gate structure, prior to creation of the control gate structure. The addition of the shallow, ion implanted arsenic region, improves the coupling ratio at the source, which in turn results in the ability of the flash EEPROM device to sustain about 1,000,000 program/erase cycles, compared to counterparts, fabricated without the shallow, source side region, only able to sustain about 400,000 program/erase cycles.
摘要:
The present invention provides a structure and a method of forming a stepped trench oxide structure for a semiconductor memory device. The stepped trench oxide structure has "oxide steps" (e.g., 252 or 34A, 34B, 34C) in the gate oxide 20 surrounding the tunnel oxide layer 30. The oxide steps 34 are formed where the oxide thinning effect normally thins the tunnel oxide 30 around the perimeter of the tunnel oxide layer 30. The oxide steps 34 252 compensate for the oxide thinning effect and eliminate the problems associated with the oxide thinning effects. The oxide steps are preferably formed using one photo mask to form two different sized openings using different photoresist exposure times. The preferred method comprises forming a first tunneling opening 220A in a first (gate) oxide layer 220. Then, forming a second oxide layer 250 over said exposed substrate and said first oxide layer 220. A second opening 250A (smaller than the first opening) is formed in the second oxide layer thereby forming a first step 252. Next, a third oxide layer 270 is formed over said exposed substrate, the first oxide layer 220 and the second oxide layer 250 thereby propagating the first step 252. The oxide thinning edge effect is eliminated by the first step.
摘要:
A new method is provided to monitor and to prevent IMD oxide irregularities such as IMD oxide cracks. A monitoring pattern is inserted in the test line of the fabrication substrate to monitor the strength of the created layer of IMD oxide. Variations in the characteristics of the created layer of IMD oxide can in this manner be detected. In addition, design rules are provided that are aimed at avoiding layers of IMD oxide that have proven or are known to be particularly prone to the occurrence of IMD oxide cracks.
摘要:
This invention relates to the fabrication of integrated circuit devices and more particularly to a method for reducing the otherwise excessive negative TCR of low doped polysilicon load resistors in sub-micron, NMOS based, 4 transistor SRAM cells. The problem with a high negative TCR is that cell failures can occur as operating currents drop down too close to device leakage currents, when operating at cold temperatures. The key to this invention is a novel PN junction approach which causes polysilicon resistors to become electrically thicker at colder temperatures. A vertical PN junction is formed along the entire length of a polysilicon resistor and the temperature dependent space charge region of the PN junction is used for modulating the effective electrical thickness of the resistor. Consequently, the undesirable tendency for thermally activated grain boundary conduction to decrease with cold temperatures is partially compensated by a slight concurrent increase in resistor thickness. A method is described for fabricating such novel polysilicon load resistors, which can be used for operating 4T SRAMs at temperatures, as low as −45 C., while not appreciably adding to process or device complexity.
摘要:
A method for making improved polysilicon FET gate electrodes having composite sidewall spacers is achieved. After forming the polysilicon gate electrodes on the substrate, a SiO.sub.2 stress-release layer is deposited having a trapezoidal shape. A Si.sub.3 N.sub.4 layer is deposited and plasma etched back using the SiO.sub.2 layer as an etch-endpoint-detect layer to form composite sidewall spacers that include portions of the trapezoidal-shaped oxide layer. The SiO.sub.2 layer protects the source/drain areas from plasma etch damage that could cause high leakage currents. The Si.sub.3 N.sub.4 also extends over the SiO.sub.2 layer at the upper edges of the polysilicon gate electrodes. This prevents erosion of the SiO.sub.2 along the gate electrodes when the remaining oxide is removed from the source/drain areas using hydrofluoric acid wet etching. When an insulating layer is deposited over the FETs, and self-aligned contact openings are etched to the source/drain areas and extending over the gate electrodes, the Si.sub.3 N.sub.4 extending over the portion of the trapezoidal-shaped SiO.sub.2 layer that forms part of the composite sidewall spacer protects the SiO.sub.2 from etching. This results in more reliable contacts without degrading the FET performance.
摘要翻译:实现了具有复合侧壁间隔物的改进的多晶硅FET栅电极的方法。 在基板上形成多晶硅栅电极之后,沉积具有梯形形状的SiO 2应力释放层。 沉积Si 3 N 4层并使用SiO 2层等离子体蚀刻回蚀刻端点检测层,以形成包括梯形氧化物层的部分的复合侧壁间隔物。 SiO 2层保护源极/漏极区域免受可能导致高漏电流的等离子体蚀刻损伤。 Si 3 N 4也在多晶硅栅电极的上边缘处在SiO 2层上延伸。 当使用氢氟酸湿蚀刻从剩余的氧化物从源极/漏极区域移除时,这防止了沿着栅电极的SiO 2的侵蚀。 当绝缘层沉积在FET上方,并且自对准接触开口被蚀刻到源极/漏极区域并且在栅电极上延伸时,Si3N4延伸超过形成复合材料的一部分的梯形SiO 2层的部分 侧壁间隔件保护SiO 2免受蚀刻。 这导致更可靠的触点,而不会降低FET性能。
摘要:
A method and test site for monitoring the extent of buried contact trench formation in MOS FET integrated circuit wafers is described. A number of doped silicon parallel first test electrodes are formed in test site regions of a wafer and connected in series. The test site regions are located in the spaces between chip regions of the wafer. A layer of gate oxide is then deposited over the wafer. Test openings over the first test electrodes and buried contact openings are etched in the gate oxide layer at the same time. The test openings have the same size and shape as the buried contact openings. After polysilicon and metal silicide is deposited a photoresist mask is formed to etch the buried contact electrodes, the gate electrodes, and second test electrodes which are located directly above the test openings. Any misalignment in the photoresist mask will cause trenches to be formed in the first test electrodes as well as the formation of buried contact trenches. These trenches in the first test electrodes will cause an increase the resistance of the first test electrodes which is related to the extent of the buried contact trenches. The first test electrodes can be oriented to measure the extent of buried contact trench formation regardless of orientation.
摘要:
The present invention provides a structure and a method of forming a stepped trench oxide structure for a semiconductor memory device. The stepped trench oxide structure has "oxide steps" (e.g., 252 or 34A, 34B, 34C) in the gate oxide 20 surrounding the tunnel oxide layer 30. The oxide steps 34 are formed where the oxide thinning effect normally thins the tunnel oxide 30 around the perimeter of the tunnel oxide layer 30. The oxide steps 34 252 compensate for the oxide thinning effect and eliminate the problems associated with the oxide thinning effects. The oxide steps are preferably formed using one photo mask to form two different sized openings using different photoresist exposure times. The preferred method comprises forming a first tunneling opening 220A in a first (gate) oxide layer 220. Then, forming a second oxide layer 250 over said exposed substrate and said first oxide layer 220. A second opening 250A (smaller than the first opening) is formed in the second oxide layer thereby forming a first step 252. Next, a third oxide layer 270 is formed over said exposed substrate, the first oxide layer 220 and the second oxide layer 250 thereby propagating the first step 252. The oxide thinning edge effect is eliminated by the first step.