Question

The efficiency of today’s best solar cell is about ___________

(a) 15-20%

(b) 40%

(c) 50%

(d) 75%

This question was addressed to me in an international level competition.

This interesting question is from Nanotechnology in portion Materials and their Properties of Engineering Chemistry I

Answer 1

Right choice is (b) 40%

For explanation I would say: The efficiency of today’s best solar cells is about 40%. A solar cell or photovoltaic cell is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect.