Atlas spectral response simulation does not converge

I am simulating a photodetector using Atlas from Silvaco. The simulation uses Luminous module to calculate the photocurrent for a range of optical wavelength. Somehow the simulation cannot converge for higher wavelengths.

It turns out due to the Schrodinger-Poisson calculation. I added in SCHRO in models statement since I wanted to calculate the conduction band as well.
models bgn srh auger conmob fldmob print schro
But this causes the simulation cannot converge when calculating higher optical wavelengths. After I remove the SCHRO parameter from model, the simulation converge


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