Archive for February, 2007

Tiny Baby Girl

February 26, 2007

This baby girl has been adopted by my friend and her husband last December through a government organization.

After 1 week born.

Yes!!! I am a girl.

She looks brilliant, isn’t she?

 

How attractive eyes you have.

 

Sleepy lor…

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My Favourite Fried Rice

February 24, 2007

I seldom help out my mom in the kitchen. Just that sometimes play a role as observer rather than an assistant. That’s where I learned the recipe. I never try it out until I got married. After married, I used to cook some simple stuffs like fried rice, fried rice vermicelli, koay teow th’ng, assam laksa, chicken rice, nasi lemak, pasta, and spaghetti during weekends. During weekdays, I will just cook some Chinese cuisine like steam fish, stir fry vegetables, various kind of egg dishes, and several kinds of soups (place all ingredients in the slow cooker before I go to work, and cook for about 10 hours). Occasionally, I will try out new recipe, which I got it from the internet. My hubby like my dishes very much :P.

It’s quite often for me to cook fried rice, as the ingredients can be easily achieve from the fridge.

Recipe for 2 persons:

Ingredients:

  • cooled rice (cooked from 180ml rice)

rice1.jpg

  • 4 eggs
  • 5 tbsp oil
  • 3 garlic & 2 shallots (chopped & mixed)

garlic1.jpg

  • 15 medium size prawns, shelled and cut into 4 piece each

prawns.jpg

  • 2 tbsp dried shrimps, soaked cut into small pieces
  • mixed vegetables (optional)


Seasoning

  • 5 tbsp light soy sauce
  • 3/4 tbsp dark soy sause
  • 1 tbsp chili paste

Method:

Heat 2 tablespoons oil in a wok, add the eggs and scramble the eggs until cooked. Dish out and set aside.

scrambled-egg.jpg
Add remaining oil to the wok. Put in chopped garlic, shallots and sauté for a while. Add dried shrimps and prawns, sauté until fragrant. Add chili paste and 1 tbsp light soy sauce, sauté until fragrant.

Add in rice and mix in dark soy sauce and remaining light soy sauce. Stir briskly to mix the ingredients thoroughly. Return the eggs to the wok and mix well to blend.

Dish out rice to serve.

fried-rice.jpg

We Are Working At The Upper Layer Of Stratosphere!

February 23, 2007

In wafer manufacturing industry, we often work in cleanroom. The environment is similar to the upper layer of stratosphere. Here, the concentration of airborne particles is controlled. Before entering cleanroom, we have to change into protective clothing like hats, facemasks, gloves, boots and bunny suit. I still remember that I took for more than 10 minutes to put on cleanroom class 10k’s bunny suit for the first time. When comes to cleanroom class 100, it is even worst. I took me for more than 15 minutes, just to figure out which piece to put on first. Once you failed the sequence, you have to start all over again. It could be a tough job if you’ve never done it before. I tell you. Really!

Hi, we are in bunny suit, no make-up is allowed.

Me and the silicon wafers

Me, doing wafer inspection

Silicon Wafer Manufacturing e-tour

February 22, 2007

How much do you know about silicon wafer manufacturing? Silicon wafers are the starting materials of most semiconductor devices. Just imagine a day without electronics. We will have no comfort in cars, no cellular phones, no PDA, no PSP, no game boy or even personal computers. Semiconductor chips have brought revolutionary changes to our lifestyle and are the key drivers and supporters of multimedia society.

Bear in mind that silicon wafer manufacturing is different from wafer fabrication. Raw silicon wafer manufacturing is to process silicon ingot into thin slice of wafer in specific diameter. These wafers will be used as raw material in wafer fabrication, which the manufacturer will process the wafer become up to hundreds of dies, depends on the wafer size. These dies will be process into integrated circuit by IC manufacturer.


I worked with silicon wafer manufacturer previously, and would like to share the basic knowledge on this industry, which I think somebody may be interested on it. Just treat it as kind of e-visit to wafer manufacturing site.

Wafer manufacturing process is started with:

 

Process 1: charging the ultra pure poly-crystalline silicon nuggets into a quartz crucible, and heating it up to around 1400°C. The output is silicon ingot.

Process 2: Slicing, the single crystal ingot cut into very thin wafers using a wire saw, or and inner diameter saw.

Process 3: Lapping, stain layer caused by slicing is removed from wafer surface, and thickness variation of wafers is improved.


Process 4: Etching, relieves mechanical strain and contamination in chemical solution. This process is also to improve surface flatness of wafer.


Process 5: Heat treatment, kills oxygen donors to stabilize resistivities.


Process 6: Polishing, makes mirror surfaces free from damages by mechano-chemical reactions.


Process 7: Cleaning, removes particles, heavy metals and other impurities.


Process 8: Inspections, ensures wafers manufactured are compliances to particle allowances, cosmetic specifications, like flatness, warp, dimple, pit, contamination, etc.


Process 9: Epitaxial grow, means the grow of silicon crystal firm upon a silicon crystal substrate. In an epitaxial reactor, epitaxial layer grows in a Si-H-Cl gas atmosphere with a dopant gas.


Process 10: Argon annealing at high temperature to annihilate crystalline defects near surface.


Process 11: Particle Count, if particle qty > specs, wafers required to go back to cleaning process. This is very important to prevent high reject rate in wafer manufacturing.



Process 12: Sampling check on wafer surface flatness as outgoing quality control.

The First Job Interview I Attended

February 16, 2007

Back in year 2002, when I first graduated from university, I was so keen to find a job in semiconductor field. Part of the reason is because I majored in Applied Physics, and subjects like “semiconductor” and  “semiconductor fabrication” are some of the most valuable subject for an Applied Physics degree holder, not to mention if you can get your hands on final year project like “semiconductor light emitting”.

Not to be too choosy (really! J), I also applied for engineering/QA position in other related fields, like electronics and telecommunication industry. Honestly said, I am a good planner. I will always plan my schedule ahead. And definitely, there was no exception for this important moment, one of the turning points in my life. I got my resume and cover letter ready and started to applied jobs though Jostreet.com before my final exam. I received a phone call from a company for an interview appointment on the next day I completed my exam. Thank God! Finally, I got a response! This was my first appointment for a job interview. It’s so meaningful.

The first thing I did is to log on to Jobstreet to view the company’s profile, understand their company background and history. Next, I searched the net for some info on interviews. You can learn a lot from other people’s experiences, the common “dos” & don’ts”.

From my survey, I got to know that the company who called me is a silicon wafer manufacturer. It’s a join venture company between Germany and Japan, and Japanese guy in-charge to run the operation. Not bad huh? Maybe it’s a good opportunity for me, as I spoke some Japanese as well. Hopefully, I will get higher priority compared to the other candidates. Oh yes, forgot about the position, it’s Special Assignment Engineer. Sound nice, right?

Nervous, nervous, adrenalin keep on pumping….. It was time for THE interview. The interview was held in a big conference room, with a panel of interviewers consisted of Engineering Director (Japanese), Engineering Manager (Japanese), HR Manager (Malaysian), and two Assistant Engineering Manager (Malaysian). The atmosphere is so threatening, fearful… I kept on telling myself to calm down, and to seize this opportunity to “sell” myself to the team. Just be myself. Each of the questions was processed in my mind, thought about their intention of asking it, and answered in the most rational way. Some guidelines for your reference based on my experiences:

  1. The answer to the technical question must be accurate. If you are doubtful, just tell the interviewer you are not sure, because haven’t learned or experience it, but will find out the answer.
  2. Be humble, tell the interviewer the real thing. It helps the interviewer understand you, and judge whether the vacancy suits you. 
  3. One way to express that you are interested in the job posted will be asking questions about the job scope, working environment, and the interviewer’s expectation.
  4. Eye contacts during conversation will proof your confidence, and be respectful to the interviewer.

Ok, back to the interview. During the whole length of the interview, there were just 2 persons asking question actively. They were the HR Manager and the Japanese Engineering Director. Questions are mostly about my background, and my knowledge about silicon wafer manufacturing processes. Luckily I did some homework on the silicon wafer processes. Basically, they had silicon wafer samples with them. They threw questions to test you how much you can describe the different types of wafer, like the silicon wafer is “p” type or “n” type, how to determine it, how to make the silicon ingot as “p” type or “n” type, and the production steps to turn the ingot into slice form, etc…With semiconductor knowledge as foundation, I don’t have problem to provide accurate answer. The Japanese Engineering Director gave up eventually and told the rest he did not have other questions. The interview ended in about an hour’s time, and I was asked to wait for their call, if I’m selected for the second interview. Oh goodness, second interview some more. What to do? Wait lor… Luckily after one week’s waiting, I got the phone call. So, I attended the second interview, and hopefully it will be the last interview.

The second interview was basically focused on situational problem solving. They gave me some conditions to test on my problem solving skills. I guess the purpose was to judge whether I’m up for the task, able to work independently under minimize supervision, and work under pressure. Anyway, there was no right or wrong on the answers given, but after went through this session, the interviewer will know how creative you are and how well you are able to express your opinion. The interview ended, and wait again…

Time flies…  still no news…. I started to feel frustrated and disappointed. But surprisingly the HR Manager called me up after one month, offered me the job, and asking whether I’m still interested. Hell, Why not? I was waiting for so long, and other job interviews were not successful either. Hurrah!!! Finally I got a job. As Special Assignment Engineer.