What is Generation Rate?
The generation rate gives the number of electrons generated at each point in the device due to the absorption of photons. Generation is an important parameter in solar cell operation. The changing absorption coefficient causes the light to be absorbed at different depths. The generation rate has been normalized.
What is the generation rate of electron and holes?
The number of generated electron-hole pairs is proportional to the number of absorbed photons. Since the energy of each photon is ħω, the generation rate is given by: (6.27) where Qe is equal to the average number of electron-hole pairs produced by one photon.
What is generation in semiconductor?
Carrier generation is a process where electron-hole pairs are created by exciting an electron from the valence band of the semiconductor to the conduction band, thereby creating a hole in the valence band.
What is meant by rate of generation and recombination?
Carrier generation describes processes by which electrons gain energy and move from the valence band to the conduction band, producing two mobile carriers; while recombination describes processes by which a conduction band electron loses energy and re-occupies the energy state of an electron hole in the valence band.
What is recombination current?
electric-current semiconductor-physics. This term is used frequently to describe the mechanism of current flow in a forward biased PN junction. It is called “recombination current”, where recombination is the process of conduction electrons filling holes in the valence band, thus eliminating an electron-hole pair.
At what temperature does the electron-hole pair generated?
The change in average energy consumed in the generation of electron-hole pairs with temperature in Al0.8Ga0.2As is significant over the measured range: at 342 K it takes only ∼88% of the energy it does at 261 K to generate an electron hole pair on average.
What is ap type semiconductor?
A p-type semiconductor is an extrinsic type of semiconductor. When a trivalent impurity (like Boron, Aluminum etc.) is added to an intrinsic or pure semiconductor (silicon or germanium), it is said to be a p-type semiconductor. Trivalent impurities such as boron (B), gallium (Ga), indium (In), aluminum (Al) etc.
What is meant by avalanche breakdown?
Avalanche breakdown (or “the avalanche effect”) is a phenomenon that can occur in both insulating and semiconducting materials. It is a form of electric current multiplication that can allow very large currents within materials which are otherwise good insulators. It is a type of electron avalanche.
What is recombination rate in semiconductor?
Recombination is the mechanism that is utilized by extrinsic semiconductors to equilibrate excess charge carriers through the bringing together and annihilation of oppositely charged carriers. Specifically the annihilation of positively charged holes and negatively charged impurity or free electrons.