Can anyone suggest some technique to find out FF enhancement of an organic solar cell embedded with metal nanoparticles compared to the solar cell without nanoparticles?
Dear Shamjid ,
the value of FF depends on :
1.The series resistance of the solar cell,Rs
2.The parallel resistance of the solar cell.Rsh
3.The recombination current in the space charge region of the cell.
4.The reverse saturation current of the junction I0
Where Rs values could tell you how bad or good is the resistance between the different layers of your solar cell. [interface between ITO and PDOT:PSS, active layer and PDOT:PSS and Active layer and Al\Ag\Au electrode (contact resistance )].
Keeping the above stuff in mind, when you put gold nanoparticles in your active layer (or in your device), so in principle it should enhance the conductivity of your active layer ( and facilitate electron-hole pair to reach their electrodes )..mean Rs value could get better and hence you will have good FF. But, the same time nanoparticles could disturb your interface layers in the device as well..so there must be some optimization process.
Now coming to your question, I don't think there would be some technique that could directly correlate FF value with nanoparticles in the device. As Everything influence the FF in device.
Best,
Imran
Imran covered all the bases. It's difficult to narrow down what the main reason is without more information. Are the gold NPs in the absorber, in the emitter, in the contact, or just on top of the cell? Do they form a percolating network or are they isolated? Do you expect their effect to be mainly optical or electrical?
yes the NPs can affect the FF, from the I-V curves, we can observe an improvement for both resistances. So, we can see that the NPs can modulate the total resistance by redistributing the potential and electric field in the solar cell. moreover, the metallic nature of the NPs can reduce the series resistance.
Best,
Faycal
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