(a) What type of semiconductors are formed by doping silicon with boron or gallium? Using...

(a) What type of semiconductors are formed by doping silicon with boron or gallium? Using simple band theory, explain how the semiconducting properties of Si are altered by doping with B or Ga.

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(b) An active area of research within the field of Ga3+ and In3+coordination chemistry is the search for complexes suitable for use as radiopharmaceuticals. Suggest how ligands 13.51 and 13.52 are likely to coordinate to Ga3_i~ and In3-' respectively.