Qualitative Comparison of Semiconductor Band Gaps
Will GaP have a larger or smaller band gap than ZnS? Will it have a larger or smaller band gap than GaN?
Which of these statements is false?
<a) As you go down column 4A in the periodic table, the elemental solids become more electrically Conducting. {b> As you go down column 4A in the periodic table, the band gaps of the elemental solids decrease. (c> The valence electron count for a compound semiconductor averages out to four per atom. <d> Band gap energies of semiconductors range from --0.1 to 3.5 eV. . {e> In general, the more polar the bonds are in compound semiconductors, the smaller the band gap.
Chemical Synthesis: Retrosynthetic Analysis attributed to E.J. Corey Symbols: Retrosynthesis: Planning a synthesis backwards. Start from the product target molecule work backwards to simpler molecules and propose a series of reactions to assemblethese smaller molecules into the larger target molecule. Some terms 1. Target molecule: the molecule we are going to prepare 2. Precursors: molecules of simpler structure used to prepare the target. 3. Disconnection: a proposed bond cleavage for preparing the desired bond. When working forward, there needs to be a logical chemical reaction to create the new bond. Possible disconnections heterolytic (ionic) or homoly
