SSC General Science & Technology Sample Paper NCERT Sample Paper-7

  • question_answer
    Consider the following statements about 'Quantum Dot' solar cells:
    1. Researchers from the University of Toronto created a solar cell out of inexpensive materials that was certified at a world record 7% efficiency.
    2. The new solar cell designed are called quantum dot films, leading to the most efficient quantaum dots solar cell ever and it has a smaller size in (nanometers). Which of the statement s) given above is/are correct?

    A)  Only 1 

    B)  Only 2

    C)  Both 1 and 2

    D) neither 1 nor 2

    Correct Answer: C

    Solution :

    [c] Quantum dot solar cells are an emerging field in solar cell research that uses quantum dots as the photovoltaic material, as opposed to better-known bulk materials such as silicon, Copper Indium Gallium Selenide (CIGS) or cdte. A Quantum dot is portion of matter (e.g. semiconductor), whose excitons are confined in all three spatial dimensions. The term quantum dot was coined by Mark Reed.

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