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Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 5 Page 111 <strong>of</strong> 316Semiconductor-Based Light Detectors:Photodiodes:p-type Sip-n junctionn-type Si+P + -B - +B -P + -The only carriers <strong>of</strong>current in p-type Si are:The only carriers <strong>of</strong>current in n-type Si are:Holes!Electrons!Why does B (or Al) become (-) and P become (+)?Both B and P are forced to become tetravalentby the bounding atoms in the lattice – this leavesa curious formal charge!B(p-dopant)Mobileholes.P(n-dopant)MobileelectronPage 111 <strong>of</strong> 316

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