1.Coversion of photons directly into flowing electrons
2. Semiconductor technology
What explains the differences in properties between metals and non-metals?
The prescence of free electrons
Metals
1. High electrical and thermal conductivity
2.Metallic lust;opaque solids
Non-metals
1. Low electrical and thermal conductivity
2. Solids,liquids, or gases
Doping
adding small amounts of contaminants to the pure silicon structure
p-n Junctions
1. materials, excess electrons from the n side diffuse across the junction into the p side, and excess holes from the p side diffuse across the junction to the n side
2. Storng permanent electrostatic field
Pros/cons: Mono-crystalline
1. Pro
-High efficiency
2. Con
-Increased manufacturing cost caused by the supply shortage silicon
Pros/cons: Poly-crystalline
1. Pro
-High efficiency with respect to price
2. Con
-Increased manufacturing cost caused by the supply shortage silicon