Optimizing Semiconductor Efficiency: Exploring Cost-Free Materials

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If cost wasn't an issue, what would semiconductors be made from to maximise their efficiency,useful lifetime etc?
 
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It really depends on the application. Silicon, for example, isn't just cheap: it also has a native oxide that can be easily grown without forming surface states. III-V compounds, while generally faster, don't have good native oxides, and make poor-quality FETs. On the other hand, III-Vs are great for HBTs.
 

Thread 'Instantaneous dipole moment and orbitals'

Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...
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