Question

Identify the wrong statement with reference to a solar cell.
A. It is a p-n junction diode with no external bias.
B. It uses materials of high optical absorption
C. It uses materials with a bandgap of 5ev.
D. It converts light energy into electrical energy
E. It uses materials such as GaAs, Si.

Answer 1

Solar cell is a p-n junction that generates emf when the light of energy greater than its bandgap is incident on it. The junction area is kept broad to improve the quantity of incident light energy and hence generated current. The formation of emf by a solar cell is a sequence of three processes- generation, separation, and collection by the following association of electron-hole pairs. This gives rise to a voltage called photovoltage with a p-side positive and n-side negative. They are utilized like an energy supply in spacecraft, calculators, etc.

Complete step by step answer:
Crystalline silicon material is used in a solar cell, which is highly optical absorbent. In which gallium GaAs and Si material is used.In a solar cell, the material is used with a bandgap of 5ev. And it transforms light energy into electrical energy.
Therefore statement (C) is wrong.
C: It uses materials with a bandgap of 5ev.

Note: : There are two operative areas and three likely "biasing" conditions for the standard Junction Diode, and these are:
1. Zero Bias – No external voltage potential is utilized to the PN junction diode.
2. Reverse Bias – The voltage potential is correlated negatively to the P-type material and positive to the N-type element across the diode, which changes the PN junction diode's width.
3. Forward Bias – The voltage potential is combined positively to the P-type material and negative to the N-type material across the diode, which has the effect of Reducing the PN junction diodes width. The solar cell must have Eg ∼ 1.0−1.8eV, large optical consumption, high electrical conductivity, easy availability, and low cost. Some selected elements are Si, GaAs, Cd Te​.