摘要:
Methods for forming a microcrystalline silicon layer in a thin film transistor structure are provided. In one embodiment, a method for forming a microcrystalline silicon layer includes providing a substrate in a processing chamber, supplying a gas mixture having a hydrogen-based gas, a silicon-based gas and an argon gas into the processing chamber, the gas mixture having a volumetric flow ratio of the hydrogen-based gas to the silicon-based gas greater than about 100:1, wherein a volumetric flow ratio of the argon gas to the total combined flow of hydrogen-based gas and the silicon-based gas is between about 5 percent and about 40 percent, and maintaining a process pressure of the gas mixture within the processing chamber at greater than about 3 Torr while depositing a microcrystalline silicon layer on the substrate.
摘要:
The invention generally relates to a plasma enhanced chemical vapor deposition chamber for depositing amorphous or microcrystalline silicon on a glass substrate to fabricate solar voltaic cells. The chamber includes a backing plate having at least one fluid receiving conduit to receive cooling fluid to remove heat generated within the chamber by the plasma, thereby stabilizing and cooling the backing plate to assure the uniformity of deposition of materials on the surface of the substrate.
摘要:
An apparatus and method for supporting a substantial center portion of a gas distribution plate is disclosed. At least one support member is capable of engaging and disengaging the diffuser with a mating connection without prohibiting flow of a gas or gasses through the diffuser and is designed to provide vertical suspension to a diffuser that is supported at its perimeter, or capable of supporting the diffuser without a perimeter support. In one aspect, the at least one support member is a portion of a gas delivery conduit and in another embodiment is a plurality of support members separated from the gas delivery conduit. The at least one support member is capable of translating vertical lift, or vertical compression to a center area of the diffuser. A method and apparatus for controlling gas flow from the gas delivery conduit to the gas distribution plate is also disclosed.
摘要:
A method and apparatus is provided for controlling the etch profile of a multilayer layer stack by depositing a first and second material layer with differential etch rates in the same or different processing chamber. In one embodiment of the invention, a process for etching substrate material is provided including depositing a first silicon-containing material layer having a first etch rate on the substrate surface from a nitrogen-containing precursor at a first flow rate and a silicon-containing precursor, depositing a second silicon-containing material layer having a second etch rate different than the first etch rate on the first silicon-containing material layer from the nitrogen-containing precursor at a second flow rate different than the first flow rate and the silicon-containing precursor, etching the first silicon-containing material layer and the second silicon-containing material layer, and forming a taper etch profile in the first silicon-containing material layer and the second silicon-containing material layer.
摘要:
A method of PECVD deposition of silicon-containing films has been discovered and further developed. The method is particularly useful when the films are deposited on substrates having surface areas which are larger than 25,000 cm2. The method prevents the deposition of partially reacted silicon-containing species which form a powdery material or haze (contaminant compound) on the substrate surface. The contaminant compounds are avoided by assuring that the power applied to form a plasma in the PECVD process is maintained, at least at a minimal level, until reactive silicon-containing precursor gases present above the surface of the substrate have been reacted or evacuated from the plasma processing area.
摘要:
Abnormal conditions within an RF-powered plasma process chamber are detected by detecting whether the frequency of a variable-frequency RF power supply moves outside established lower and upper limits. In a first aspect, a first pair of lower and upper limits are established as a function of the frequency of the power supply sampled after a new process step begins or after a sample control signal changes state. In a second aspect, a second pair of lower and upper limits are not adapted to the frequency of the power supply. Both aspects preferably are used together to detect different occurrences of abnormal conditions.
摘要:
Embodiments of a gas distribution plate for distributing gas in a processing chamber are provided. In one embodiment, a gas distribution plate includes a diffuser plate having a plurality of gas passages passing between an upstream side and a downstream side of the diffuser plate. At least one of the gas passages includes a first hole and a second hole coupled by an orifice hole. The first hole extends from the upstream side of the diffuser plate while the second hole extends from the downstream side. The orifice hole has a diameter less than the respective diameters of the first and second holes.
摘要:
A color polymer dispersed liquid crystal display includes a lower substrate, an upper substrate, color liquid crystal-polymer films, and two transparent liquid crystal driving electrodes, among others. The color liquid crystal-polymer films are formed by foaming polymer films mixed with red, green and blue pigments to form porous films of red, green, and blue colors and then dropping and injecting liquid crystal into droplets of the porous films under vacuum condition. One of the two transparent liquid crystal driving electrodes is disposed between the lower substrate and the PDLC films, and the other is disposed between the PDLC films and the upper substrate. The changes in properties of the PDLC films, which may be caused by unstable phase separation in a conventional phase separation process, are reduced, and the colors are improved.
摘要:
A method and apparatus for providing an electrically symmetrical ground or return path for electrical current between two electrodes is described. The apparatus includes at least on radio frequency (RF) device coupled to one of the electrodes and between a sidewall and/or a bottom of a processing chamber. The method includes moving one electrode relative to another and realizing a ground return path based on the position of the displaced electrode using one or both of a RF device coupled to a sidewall and the electrode, a RF device coupled to a bottom of the chamber and the electrode, or a combination thereof.
摘要:
Methods and apparatus for encapsulating organic light emitting diode (OLED) structures disposed on a substrate using a hybrid layer of material are provided. The processing parameters used during deposition of the hybrid layer of material allow control of the characteristics of the deposited hybrid layer. The hybrid layer may be deposited such that the layer has characteristics of an inorganic material in some sublayers of the hybrid layer and characteristics of an organic material in other sublayers of the hybrid layer. Use of the hybrid material allows OLED encapsulation using a single hard mask for the complete encapsulating process with low cost and without alignment issues present in conventional processes.