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kk dewitt pdf download modern economic theory1. Field of the Invention
The present invention relates to a method of manufacturing a semiconductor device and, more particularly, to a method of manufacturing a nonvolatile memory cell.
2. Description of the Related Art
In the manufacturing process of a nonvolatile memory cell, the process for forming the polysilicon layer is most difficult. Conventionally, to form a gate electrode layer of the nonvolatile memory cell, first, a boron diffusion layer is formed in the channel region, and then, a polysilicon layer doped with a high concentration of boron is formed on the boron diffusion layer. However, when the polysilicon layer is exposed to light, electrons are trapped in the polysilicon layer, thus increasing the threshold voltage of the nonvolatile memory cell.
To overcome the above-mentioned drawback, the polysilicon layer has to be formed after the exposure to light, for example, at a high temperature, so that the electrons trapped in the polysilicon layer are removed. However, a gate electrode layer with high resistance may be produced if the polysilicon layer is formed after the exposure to light at a high temperature, resulting in degradation of the quality of the device. In addition, a reduction in the rate of deposition of the polysilicon layer due to the high temperature may cause a phenomenon of undercut in the polysilicon layer.Why Are Topnotch Maternity Clothes So Expensive?
A lot of people may be like me, and end up spending an entire paycheck on maternity clothes after having children. However, it doesn’t have to be that way. Sure, we all want the most fashionable styles and the latest trends, but we also want to save money. So, how do you know which clothes are actually on the cheaper end? Read on to find out.
1. Skinny Maternity Jeans
There are a lot of cheap maternity jeans out there, but finding them is a bit of a challenge. First, most people may not even know they exist. While other styles of jeans are cut differently, maternity jeans are cut specifically for pregnancy. They are a bit shorter in the rise, and they come in a wider range of sizes than regular jeans. When you are looking for maternity jeans, you should look for a pair that
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