What are the differences between homojunction and heterojunction laser?
Table of Contents
- 1 What are the differences between homojunction and heterojunction laser?
- 2 What is a heterojunction laser?
- 3 What are the advantage of heterojunction over homojunction?
- 4 What is homojunction laser?
- 5 What is double heterojunction laser?
- 6 What are homojunction and heterojunction PV cells?
- 7 What is difference between photoelectric properties of homojunction and heterojunction?
- 8 What is Homojunction laser?
What are the differences between homojunction and heterojunction laser?
A homojunction semiconductor laser is the junction between differently doped layers or regions of same semiconductor material having equal band gaps. A heterojunction semiconductor laser is the junction between different layers or regions of different types of semiconductor materials.
What is a heterojunction laser?
Heterojunction Lasers : two interfaces of different indexes of refraction, one on top and one below the active region, so two junctions are formed in what is called a heterostructure laser diode, or a double heterostructure, since there are two confining interfaces.
What is a homojunction and heterojunction?
A homojunction is a contact between two of the same semi- conductors (silicon with silicon for example) while a heterojunction is a contact between two dissimilar materials.
What are the advantage of heterojunction over homojunction?
The heterojunction solar cells have several advantages over homojunction cells such as high flexibility in band gap engineering and wide availability of various materials and combinations in designing PV cells with better absorption and efficiency.
What is homojunction laser?
Homojunction means the laser devices use the same material for both the p and n sides of the junction. The output power increases with the volume of the active layers, linear or stacked diode laser arrays can generate up to 20W cw and peak power up to 100W in quasi-CW operation.
What do you mean by homojunction?
A homojunction is a semiconductor interface that occurs between layers of similar semiconductor material, these materials have equal band gaps but typically have different doping.
What is double heterojunction laser?
Modern diode lasers are double heterostructures in the vertical direction. A thin active layer is sandwiched between top and bottom cladding layers, the top layer being p-type and the bottom n-type.
What are homojunction and heterojunction PV cells?
A homojunction uses the same semiconductor material (of course with different doping) on both sides of the junction, a heterojunction uses two semiconductor materials having different bandgap energies on both sides of the junction.
Why heterojunction semiconductor laser are preferred?
A single heterojunction between two materials improves the confinement of light and electrons enough for a diode laser to operate in pulsed mode at room temperature. If one heterojunction is good, two should better confine light and electrons, as you can see at the bottom of Figure 9-10.
What is difference between photoelectric properties of homojunction and heterojunction?
a homojunction occurs, if only the conductivity-type changes – as an example: from n-type silicon to p-type silicon. A heterojunction almost is present, if only the gap energy changes – as an example from GaAs to GaAl1-xAsx. If doping changes the gap energy, it is a heterojunction.