Doping of semiconductors



n doping This involves substituting Si by neighboring elements that contribute excess electrons. For example, small amounts of P or As can substitute Si.
Since P/As have 5 valence electrons, they behave like Si plus an extra electron. This extra electron contributes to electrical conductivity, and with a sufficiently
large number of such dopant atoms, the material can displays metallic conductivity. With smaller amounts, one has extrinsic ....etc

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Presented By
KUMARASWAMY.A


SEMICONDUCTORS & DEVICES
PART 1
MATERIALS
1.1:INTRODUCTION
All of us know how importance of using materials like copper , aluminium etc. in electrical applications. This is because copper aluminum are good conductors. Similarly some materials like glass, wood, paper etc also find wide applications in electrical and electronic applications, these are called insulators. There is also another category of materials whose ability to carry current call ....etc

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presented by:
Udo, Otobong Nna


ABSTRACT
This study was designed to find the relationship between teachers’ job satisfaction and teachers’ job performance in Secondary Schools in Ibiono Ibom local Government Area of Akwa Ibom State. Four hypotheses were formulated to guide the research and sample of two hundred (200) respondents (teachers) were randomly selected for the study. The main instrument used for data collection was the questionnaire. The hypotheses were tested using Pearson Product Moment Correla ....etc

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jayanthi
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ON THE JOB AND OFF THE JOB TRAINING METHODS
ON THE JOB AND OFF THE JOB TRAINING METHODS PPT ....etc

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