I want to calculate the IQE from EQE. I have all data absorbance as well as EQE. I also want to know what exactly purpose of IQE in solar cell.
Hi,
more accurately, the parasitic absorption within contact and interfacial layers has also to be taken into account, which can be obtained by using optical simulations of your organic solar cells, e.g. with the transfer matrix method.
A comprehensive study of different attempts to calculate the IQE for organic solar cells can be found here: http://pubs.acs.org/doi/abs/10.1021/ph400044k
http://pubs.acs.org/doi/abs/10.1021/ph400044k
Here is another reference that may help you:
Article Accounting for Interference, Scattering, and Electrode Absor...
The QE is always lower than 1. If your integration sphere sees optical noise with no or little input power, you can get a QE larger than 1.
IQE is defined as the number of absorbed photons in the solar cell to the number of collected carriers. Therefore it is very important to consider parasitic absorption via optical modelling.
An interesting discussion on the definition of IQE can be found in this paper
A. W. B. D.N. Micha, A. Walker, G. Siefer, F. Dimroth, “Influence of a Very Efficient Back Reflectors on the Quantum Efficiency of Solar Cells,” in EU-PVSEC, 2016, no. 100, pp. 20–24
Hi,
recently, we made organic solar cells with 2 parameters. Device with higher absoprtion (UV-vis) and higher EQE gave lower density current ( and lower efficiency). How to explain this situation. Thank you very much.
Dear Minh,
It seems that your cells suffer from reduced collection efficiency of the photo current.
In order to resolve the problem, it is needed to measure the cells at reverse bias also to reach to the highest value of the generated photo current. After doing this measurement we may be able to discuss the this behavior.
It was expected that the cell with the highest EQE gives the highest short circuit current.
It seems that the collection itself depends on the total current in the cell such that it decreases with increase of the total current. It seems that the i-v curve of the sensitive cell faces more shift to the left because of the more dependence of its collected current on the terminal voltage of the cell.
More discussions will be after measuring the illuminated reverse characteristics of the cells.
Best wishes
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