Multilayer devices include thyristors, diacs and programmable unijunction transistors (PUT) among others: a. Why are the

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Multilayer devices include thyristors, diacs and programmableunijunction transistors (PUT) among others:a. Why are these devices called Multilayer devicesb. Using suitable diagrams detail the arrangement of p-n junctionsin a diac and PUT. Also give their symbols.
Q1. Operation of optoelectronic devices is based on theinteraction of light energy with electrons in a semiconductor.
a. Name three devices in which light energy is absorbed toproduce an electrical output and three devices in which light isgenerated from an electrical input.a. Explain the operation of a photovotaic cell and a photodiode.Give their symbols and their practical application.b. Detail the construction of a basic p-n junction solar cell anddescribe its operation. How does a p-n solar cell differ from ap-i-n solar cell?c. Detail the construction and operation of an optocoupler. Why isan optocoupler sometimes referred to as an optoisolator?Q2.a. Electromagnet waves are central in the operation powerelectronic devices.i. Derive an expression that demonstrates that electromagneticwaves or photons, have dual particle and wave natureii. The electromagnetic spectrum is a classification ofelectromagnetic waves originating from various sources. Sketch theelectromagnetic spectrum based frequency, energy and wavelength ofphotons