From the JV curve of the simulated solar cell using SCAPS-1D If it is observed that the short-circuit current density becomes positive after an open-circuit voltage of 0.7V. Could you explain why this occurs and whether the device will still function as a solar cell under these conditions? Please provide a justification from at least two published articles
This is unusual and suggests that the solar cell might not be working properly. Normally, in a properly functioning solar cell, the J-V curve shows negative current (indicating power generation) at positive voltages up to the VOC. If the short-circuit current density becomes positive beyond a certain voltage, it indicates a potential problem with the device. This could be due to high recombination rates, high series resistance, or other factors.
You can read these papers:
Article Diffusion lengths of silicon solar cells from luminescence images
Article Solar cell fill factors - General graph and empirical expressions
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