Induced current problems

1

Dear experts,
I am running allpix2 simulation for jadepix sensor. There is something wrong with the induced current plots. I have tried some mothods, but nothing changes. I don’t know what’s wrong with my setups. I will appreciate it if you can give some advice. Thanks in advance.

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2

epi_1k_ElectricField.apf (22.9 MB)
jadepix_telescope.conf (1.8 KB)
jadepix3.conf (915 Bytes)
model_weightingpotential.apf (8.4 MB)
telescope1.conf (155 Bytes)

3

modules.root (78.1 MB)

4

Hi @zhiliang

looking at your electric field, only the top 5um of your sensor seem to contain a field. That means charge carrier motion in the rest of the volume will be dominated by diffusion, leading to a net-zero induced current.

I would expect that this part represents a substrate volume with high doping concentration, please consider adding a recombination model to properly describe this part of the sensor.

Also, I can recommend using line graphs to visualize what’s happening in your sensor, you can switch them on for your TransientPropagation module.

Best,
Simon

5

Hi, @simonspa

Thanks for your reply.
Yeah, I also study TransientPropagation and PulseTransfer modules these days and get interesting results.

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图片2227×1179 141 KB

This graph is one event pulse, indicting nothing.
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This graph is an average result of 10 events, indicating an pulse.
So I want to ask why or how to improve the first graph to show an obvious pulse.

Thanks in advance,
zhiliang

6

[DepositionPointCharge]
log_level = “INFO”
model = “fixed”
source_type = “mip”
position = -13um -8um 0um

[TransientPropagation]
temperature = 293K
charge_per_step = 10
timestep = 10ps
integration_time = 80ns
output_plots = 1

When I change charge_per_step = 10 and timestep = 10ps to charge_per_step = 1 and timestep = 0.1ps, it needs very long time and I have not gotten the result. So I don’t know whether it will improve the result.