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__________ is a direct band gap material.

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__________ is a direct band gap material.

(a) Copper Indium Gallium Selenide

(b) Copper Selenide

(c) Copper Gallium Telluride

(d) Copper Indium Gallium Diselenide

I got this question in a national level competition.

My doubt stems from Photovoltaic Cell and Solar Cell Applications in chapter Non Conventional Energy Sources and Storage Devices of Applied Chemistry

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The correct answer is (a) Copper Indium Gallium Selenide

The best I can explain: Copper Indium Gallium Selenide is a direct band gap material. It has the highest efficiency among the film materials. The efficiency is about 20%.

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