The same kind of semiconducting materia l used to make
Chapter 29, Problem 78(choose chapter or problem)
The same kind of semiconducting materia l used to make anLED can also be used to convert absorbed light into electricalenergy, essentially operating as an LED in reverse. In this case,the absorption of a photon causes an electron transition from afilled state in the valence band to an unfilled state in the conductionband. If t1000d = 1.4 eV, what is the minimum wavelengthof electromagnetic radiation that could lead to electricenergy output?A. 140 nm B. 890 nmC. 1400 nm D. 8900 nm
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