When calculating number of incident photons with sufficient frequency, We divide spectral radiance in Planck's law by energy of each photon, hv. Where does the extra pi come from?
Ah ok, it comes from integrating solid angle over the half-sphere that the blackbody radiates. Also, for P_s, the equation you showed is wrong. It should be v^3
I thought that only photons of a certain wavelength/frequency can excite electrons to conduction band. At 6:52 You said that all the photons greater than or equal to the band gap have an absorption coefficient of 1. How can this be possible?
As he said, it's just a few lines of matlab code. I'll say 20 at max. EDIT: The efficiency plot from first part of paper for cell at 0 K is just the equation at 9:36. For the second part of the paper where cell with non zero cell temperature is considered, you may look at the theory given in section 4.2 of this book: "Physics of Solar Cells" by PeterWürfel and UliWürfel . It has equations written in a better form.
Thank you so much for this video. Very thorough and clear.
the Ps expression that you have mentioned here is incorrect. it should be cube of (frequency). Kindly check from the original shockley-quessier paper
Thank you very much for the great informative video. Can you please specify exactly which part of the equation refers to the hot-carrier loss?
Excellent video. Well explained.
When calculating number of incident photons with sufficient frequency, We divide spectral radiance in Planck's law by energy of each photon, hv. Where does the extra pi come from?
Ah ok, it comes from integrating solid angle over the half-sphere that the blackbody radiates.
Also, for P_s, the equation you showed is wrong.
It should be v^3
Nice video, thank you :D
I thought that only photons of a certain wavelength/frequency can excite electrons to conduction band. At 6:52 You said that all the photons greater than or equal to the band gap have an absorption coefficient of 1. How can this be possible?
it's an assumption to say that the cell absorbs all photons that have an energy greater than bandgap (ideal factor)
Did anyone try to plot this? Matlab and even some online calculators couldn't plot the functions
As he said, it's just a few lines of matlab code. I'll say 20 at max.
EDIT: The efficiency plot from first part of paper for cell at 0 K is just the equation at 9:36.
For the second part of the paper where cell with non zero cell temperature is considered, you may look at the theory given in section 4.2 of this book: "Physics of Solar Cells" by PeterWürfel and UliWürfel
. It has equations written in a better form.