Explanation
Correct answer: A.
Choice A is the best answer. Conventional solar cell fabrication increases “the cost of manufacturing at scale,” but spray coating might get rid of that problem.
Why the other choices are wrong
Choice B
Choice B is incorrect. This is not completely supported by the text. While it’s true that conventional ETL fabrication is expensive at scale, there’s nothing in the text that mentions other perovskite solar cell architectures.
Choice C
Choice C is incorrect. This choice does not match the text. Only one conventional method of ETL fabrication is described, so we can’t compare the solution loss in this method to that of other conventional methods.
Choice D
Choice D is incorrect. This choice isn’t supported by the text. The text never suggests that the effectiveness of solar cells changes based on their method of fabrication.
Student discussion
marcosat 0 likes
I was about to choose C, but it is a logical fallacy, given that only one alternative method is described and we dont have anyway to prove it (that other approacheS are better). A works best, given that ETL at large scale is inefficient, than AN (one) alternative approach may be (spray coating).