TransWikia.com

What is the relation between the short-circuit current and the band gap energy in solar cells?

Physics Asked on December 1, 2020

For the VOC it is:

VOC = E_g – something,

where something is positive and depends on the Urbach energy. Otherwise it should be linear:
https://aip.scitation.org/doi/pdf/10.1063/1.49397

For the ISC I didn’t find anything. Only one paper on bifacial solar cells, where there Equation (4) gives a formula, but I am not sure if this is helpful for the "general" case (I am writing about CIGS solar cells right now, and a general Theory part, not specifically about CIGS): https://www.researchgate.net/publication/327345077_Thermodynamic_Efficiency_Limit_of_Bifacial_Solar_Cells_for_Various_Spectral_Albedos/figures?lo=1&utm_source=google&utm_medium=organic

Can someone elaborate, please?

One Answer

Short circuit current depends on the spectrum $S$ and the external quantum efficiency $EQE$ of the solar cell,

$$ I_{ISC} = q int_{E_1}^{E_2} S(E) EQE(E) dE $$

The number of photons usefully absorbed per second is equal to the short circuit current.

Can you get the Physics of Solar Cells by Jenny Nelson from a library? This is a great book for introducing a physics student to solar cells.

physics of solar cells Jenny Nelson

Correct answer by boyfarrell on December 1, 2020

Add your own answers!

Ask a Question

Get help from others!

© 2024 TransWikia.com. All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP