Hello Everyone,
In the line of quantum efficiency(EQE), can we express efficiency of solar photovoltaic module in terms of wavelength? Once wavelength based Jsc is calculated from the EQE equation it can be put in the efficiency equation : Ƞ=(Jscλ*Vocλ*FF)/Pin and subsequently λ based efficiency Ƞλ can be calculated. But is it a correct way ? . In the mentioned equation will we need to consider Pin for different wavelength separately. is there any the way to calculate the wavelength based efficiency of SPV module, if any?
Thanks in advance!
Hi Sankar,
At the microelectronic level (for the crystal designer or amorphous semiconductor designer, that is) what you have suggested may be of some importance.
But for the manufacturer and the user utility, a quantum level computation will have limited importance. There are some practical reasons for this:
Cheers !
-Sanjay
Dear Sankar,
As a performance parameter, the quantity which measures the dependence of the solar cell conversion efficiency on the wave length of the incident radiation is the external quantum efficiency EQE expressed as the ratio of the collected electron hole pairs to the number of incident photons at specific wavelength. It can be expressed as
EQE= (Iph(LAMBDA)/q) /[P(labda) / Ep] where Iph(LAMBDA)is the photcurrent at certain wavelength lambda, q is the electronic charge, P(lambda) is the the power of the incident photon flux at a given wavelength and Ep is the photon energy which is related to wavelength b y Ep= hc/ lambda with c the speed of light in the free space.
According to your expression of the conversion efficiency for certain wavelength,
Ƞ lambda= (ECE q /Ep) Vocλ*FF= (ECE) (qVoc/Ep) (FF)
From this equation one sees that the spectral conversion efficiency as you want to define is proportional to the external quantum efficiency ECE. The remaining factors are qVoc/Ep which is the the ratio of the useful energy qVoc to the incident photo energy Ep and finally the fill factor due to ohmic and dark current losses.
According to this analysis it can make sense to define the spectral conversion efficiency as it gives insight on the loss sources of the incident solar radiation.
wish you success
Dear Shankar,
Appreciate your interest. My thoughts are:
1. Can we change/control the wavelength of sunlight that falls on PV module?
2. Can we generate same/similar wavelength light from artificial lighting sources as compared to natural sunlight?
If answer to (1) & (2) above is YES then Pin in efficiency equation can have wavelength representation. In my view, it will be an accurate simulation model for research at lab level.
Good luck.
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