Answer the following questions: What is a solar cell? Explain its working in brief. In an energy…
Answer the following questions:
(i)
What is a solar cell?
(ii)
Explain its working in brief.
(iii)
In an energy band diagram of a certain material, forbidden band is absent. Identify the material.
Answer
Answer (i)
AIWritten by AI (gemini) - it can contain mistakes.
A solar cell (photovoltaic cell) is a semiconductor p-n junction diode that directly converts solar radiation (light energy) into electrical energy without any external bias.
Answer (ii)
AIWritten by AI (gemini) - it can contain mistakes.
When light of energy $h\nu > E_g$ is incident near the junction, electron-hole pairs are generated. The built-in electric field of the depletion region separates electrons towards the n-side and holes towards the p-side, producing a photo-voltage across the terminals. When connected to an external load, a direct current flows.
Answer (iii)
AIWritten by AI (gemini) - it can contain mistakes.
Metal (or electrical conductor).
From ISC 2027 Specimen Physics Paper 1, question 17.