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Explain elaborately the Impact of direct vs indirect band gap for optical emission/absorption for CIGS (Copper...

Explain elaborately the Impact of direct vs indirect band gap for optical emission/absorption for CIGS (Copper indium gallium (di)selenide) solar cell. What is the expected absorption wavelength of the p and n type material, respectively if the band gap is 1.0 EV and 1.7 EV respectively. (Please give the answer In details)

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