Hi, now I'm graduate student and my research part is perovskite solar cell.
our research teammates started reproducibility experiment at July. and we are still doing it. however, our I-V results have so many noise. and we don't know why.
we use FTO substrate and 4% SnO2 by diluting 15% SnO2. and we use only MAPbI3 and spiro solution without any additives. and we are doing spin coating in glove box, but when we finish coating, there are so many dust on the surface. we also use filter before coating perovskite but not working.
I'll upload our I-V result. please answer it and I hope to find problems.
Dear Joon,
I think you need to make some post heat treatment in order to achieve good contact between the different layers. The annealing must be made under proper
environment and at the proper temperature. The most suitable atmosphere is using inert gas as N2. Also, the temperature may be in around 100 degree centigrade.
The solar cell itself works properly.
I would like to make a remark: The fill factor is less than one.
In order to get the performance of the cell you have to interpolate you points lying on the curve of the solar cell.
Please report on your further experiments.
Best wishes
From the IV curves, it looks like that electrical connections to your devices have problems. How did you connect your device pixels When you tested? The solid contact probes are the best to test the devices.
You have surely some contact issues somewhere. Follow and check carefully your circuit from the contact to the cell till your acquiring device using a reference cell.
Good luck!
Ivan Sinicco Xuhua Wang
Thank you for answering question. we also thought contact problem. so, we tried to make other measurement device and use it. but it still appeared noise.
other perovskite laboratory try to measure cells with same method and they appear normal I-V graph. and they use TiO2 on ETL. the difference is only ETL materials.
and our team guess two problems. SnO2 or Ag deposition. what do you think? are there any other problems?
From the J-V curve, the problem seems to be of contact or it may be the probes. I have also faced such noisy current signals while measuring I-V. May be you can check if there is any loose contacts in probe connections.
@Joon Kim,
The contact issue for your case is either the electrode coatings that scratched off or your probe is too sharp. This type of issue is very common for the cell testing. The solution is to get the probes with small round heads not sharp point ones. Your electrode coatings such as Ag or Al should be thick enough too.
Hope it helps.
Joon Kim Yes, I said about that already. Please check if there is any loose connections in your probes or pins and try to probe your device carefully so that it doesn't spoil your device electrodes. Also avoid any kind of disturbances during measurements.
Dear Joon,
I think you need to make some post heat treatment in order to achieve good contact between the different layers. The annealing must be made under proper
environment and at the proper temperature. The most suitable atmosphere is using inert gas as N2. Also, the temperature may be in around 100 degree centigrade.
The solar cell itself works properly.
I would like to make a remark: The fill factor is less than one.
In order to get the performance of the cell you have to interpolate you points lying on the curve of the solar cell.
Please report on your further experiments.
Best wishes
The same issue is happening with my n-i-p devices. FTO/SnO2/MAFAPbIBr3/spiro/MoO3/Ag. I tried to give uv treatment for 1 min but nothing changed. Still the iv curve is giving same as mentioned by Joon.
All the devices are giving good performance near to 20%. Please tell me know how I can fix this issue with noisy iv curve.
My opinion is that it may be due to thermal degradation of spiro.
@Basumatary
@Wang
There is no contact issues because our p-i-n based devices are working well and there is no noise in the iv curve..
Hussain, Istiak, Hoang Phong Tran, Jared Jaksik, Justin Moore, Nazmul Islam, and M. Jasim Uddin. "Functional materials, device architecture, and flexibility of perovskite solar cell." Emergent Materials 1, no. 3-4 (2018): 133-154.
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