Apr 25 2014
Opto-semiconductors are semiconductors that work by absorption and emission of light. The p-n junctions are the important part of these devices. Photodiodes, LEDs, solar cells, and semiconductor lasers are all categorized as opto-electronic devices. In opto-semiconductor devices there is interaction of light, in addition to the electron-hole interaction of semiconductors.
Opto-semiconductor devices are advantageous over semiconductors in terms of conversion efficiency. Among semiconductors, the direct-band type exhibits a higher light absorption coefficient when compared to the indirect band. This datasheet will further discuss the working, construction, and applications of opto-semiconductors.
Working Principle
Opto-semiconductors consist of a light sensitive surface that absorbs light, and also emits it. Light incident on the p-n junction of the device gets converted into charge. This charge, generated by the photo-generated carriers, is called the photocurrent.
Construction and Types of Opto-Semiconductors
Similar to semiconductor devices, opto-semiconductors are made of a p-n junction. Additionally, they consist of a light sensitive surface that generates charge carriers. The opto-semiconductor types are given below:
- Light emitting diodes (LEDs)
- Photodiodes
- Laser diodes
- Solar cells
Applications
Opto-semiconductors are primarily used in applications mentioned below:
- Automotive lights
- Room lighting
- Pulsed laser power
References