8. (2 pts) Silicon semiconductors have a bandgap of1.11 eV. What is the longest photon wavelength thatcan promote an electron from the valence band tothe conduction band in a silicon-basedphotovoltaic solar cell? Show all work.E = hv = hc/λh = 6.626 x 10-34 Jsc = 3.00 x 108 m/s1 eV1.602 x 10-19 J

Answered: Image /qna-images/answer/bb4414a0-6fea-4382-873c-96aeb4971018.jpg

Answered: 8. (2 pts) Silicon semiconductors have…

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter10: Energy For Tomorrow: Solar And Other Renewable Energy Sources

Section: Chapter Questions

Problem 14E

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4. The common oxidation number for an alkaline earth metal is +2. (a) Using the Born-Mayer equation (for determining the lattice enthalpy) and a Born-Haber cycle (draw it), show that CaCl is an exothermic compound (negative AHf). Make a reasonable prediction to estimate the ionic radius of Ca (explain your reasoning). The sublimation (atomization) enthalpy for Ca(s) is 178 kJ/mol. (b) Show that an explanation for the non-existence of CaCl can be found in the enthalpy change for the reaction below. The AHf for CaCl2(s) is -190.2 kcal/mol. 2 CaCl(s) → Ca(s) + CaCl2(s)

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