The ITO(n)/a-Si(p) interface creates an opposing diode for the c-Si(n) based SHJ.I am trying to implement tunnelling using bbt.nonlocal and tat.nonlocal models.No matter how small the qtmesh is, I keep getting this warning and I get a flat J-V. QT mesh is not fine enough to calculate tunnelling current. Try refining in tunnelling direction near junction Any inputs would be highly appreciated.

Here are the relevant statements of the code:

y.mesh loc= 0 spacing= 0.01
y.mesh loc= 0.01 spacing= 0.002
y.mesh loc= 0.06 spacing= 0.01
y.mesh loc= 0.068 spacing= 0.0001
y.mesh loc= 0.069 spacing= 0.00001
y.mesh loc= 0.072 spacing= 0.00001
y.mesh loc= 0.076 spacing= 0.001
qty.mesh loc=0.069 spacing= 0.00001
qty.mesh loc= 0.071 spacing= 0.00001

intdefects intnumber="1/2" cont nga=1e13 ega=1.41 wga=0.6 siggae=1e-13 siggah=1e-13

models print srh auger boltzmann consrh tat.nonlocal bbt.nonlocal bbt.nlderivs  trap.tunnel MASS.TUNNEL=0.1