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Diffusion tubes are used in normal production process. It can provide a high minority carrier lifetime. But it is determined by the cleanliness of the tubes. Trace amount of impurity in the tubes will strongly influence the lifetime. Additionally, the phosphorous source, POCl3 is a highly toxic and corrosive chemical, which needs a high cost to manage. In this paper, a fast and uniform diffusion process...
During recent years, electronic business industry has been developed rapidly. Some companies in the industry have been listed on the security market overseas or in the domestic. They have achieved excellent performance in the stock market, and given great value returns to the shareholders. Chinese economy is experiencing an important period of transforming industrial and economic structures. More...
Since B-to-B commercial websites play a decisive role in electronic business and trade, the evaluation and selection of them are very important. There have existed many methods for evaluation on commercial websites nowadays. But there are very few patterns of evaluation that are widely recognized and accepted so far. To tolerate subjective and objective factors that might influence evaluation results,...
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