--Photolithography 1998~2003 HNS--

Photolithography (also called optical lithography) is a process used in microfabrication to selectively remove parts of a thin film (or the bulk of a substrate). It uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical (photoresist, or simply "resist") on the substrate. A series of chemical treatments then engraves the exposure pattern into the material underneath the photoresist. In a complex integrated circuit (for example, modern CMOS), a wafer will go through the photolithographic cycle up to 50 times.

~
Photolithography shares some fundamental principles with photography, in that the pattern in the etching resist is created by exposing it to light, either using a projected image or an optical mask. This step is like an ultra high precision version of the method used to make printed circuit boards. Subsequent stages in the process have more in common with etching than to lithographic printing. It is used because it affords exact control over the shape and size of the objects it creates, and because it can create patterns over an entire surface simultaneously. Its main disadvantages are that it requires a flat substrate to start with, it is not very effective at creating shapes that are not flat, and it can require extremely clean operating conditions.

~

~
~http://en.wikipedia.org/wiki/Photolithography

--Once my Work.....--

A wafer is a thin slice of semiconductor material, such as a silicon crystal, used in the fabrication of integrated circuit and other microdevices. The wafer serves as the substrate for microelectronic devices built in and over the wafer and undergoes many microfabrication process steps such as doping or ion implantation, etching, deposition of various materials, and photolithographic patterning.

~

Several types of solar cells are made from such wafers. A solar wafer is a circular solar cell made from the entire wafer (rather than cutting into smaller rectangular solar cells).

~

~http://en.wikipedia.org/wiki/Wafer_(electronics)

--Never GoodBye and See You again My Friend...--

The Bond of Friendship is Everlasting,

True Friends never say Good-Bye,

There is Pure Truth between Us,

That will Never Die.

~

The miles between will be Rough,

So carry the Memories with You,

Because The Power of Friendship,

Will always carry You Through.

~

Remember, and never Forget,

To follow what's in Your Heart,

Because true Friends,

Will never be Apart.

~

We will soon see each other Again,

Our Spirit will keep Us strong till then,

My Heart holds You deep as Friend,

~

~

So... I will Say see you Soon,

And Never Good-Bye.....

~~

~~~

~~

~

--Long Lost Friends From HNS-HITACHI--