OBJECTIVES
To find the energy band gaps for different semiconductor diodes and LEDs
PRINCIPLE
At an absolute zero-degree temperature, semiconductors are pure insulators. As the temperature is increased thermal energy creates vibrations in the crystal lattice and a few electrons, which acquire sufficient vibrational energy break their covalent bond, become free, and move to the conduction band. The energy required to rapture the covalent bond is designated as energy gap EG and termed as energy gap or band gap energy.
