Help:A strange signal

[kaka]

I used the ComponentTcad2d and TrackHeed classes in the simulation,but the result was a very strange signal curve.The first figure is the signal of cathode,and the next one is the signal of anode,I want to know why there is such a big negative signal,is it a problem with the position of the incident point or my setup?

[djjansse]

Dear @kaka,

We will need a bit more information about the simulation code and associated files you are using.

To start with, are you importing the weighting potential from a TCAD solution or defining it analytically?

In addition, how does your geometry look like and where are the electrodes placed?

Kind regards,
Djunes

[kaka]

Thanks for your reply!
I importing the weighting potential from a TCAD solution with .grd file and .dat file.I put the electric field and the weighted field figure at the end, and also marked the incident position of the photon.

[hschindl]

Thanks! You mentioned that you’re simulating a photon. To simplify the debugging, could you simulate the signal from a single electron-hole pair?
Do I understand correctly that the holes are drifting towards the central pillar (is it the column of a 3D sensor?) which is the anode?

[kaka]

Thanks！I was interested in a PhD thesis so I did this research, and this is a repetitive unit of 3D sensors.

1. The central column is the cathode, and the surrounding electrodes are the anode.
2. The first signal I gave was the result of a single photon incident.

[hschindl]

Hi,
the anodes have a quite “unusual” shape, I’m not quite sure what to expect for such a configuration. Also in reality the electric field will reflect the periodic structure of the sensor, which is not the case in your simulation, so I’m not sure it’s realistic enough.