Recently I fabricated bulk heterojunction solar cell but I don't know how to take leads. I have connected crocodile clip directly on ITO and Al. Is this right?
I think that with a crocodile clip, your sample might be vulnerable to scratching and can be destroyed.
It would be safer to use a Test Clip. In our lab we use a 3M test-clip similar to one attached.
I think that with a crocodile clip, your sample might be vulnerable to scratching and can be destroyed.
It would be safer to use a Test Clip. In our lab we use a 3M test-clip similar to one attached.
For making Ohmic contacts, you choose a material whose work function matching with your sample. It is better to coat a contact layer by evaporation and then the wire contact.
As mentioned by @Ahmed Mansour , connecting the device with crocodile destroys your device. the clip connected to aluminium may damage the Al layer as well as the underlying layers and may make direct contact with ITO, which in turn will short the device.
One solution for this is mentioned by Mr. Ahmed Mansour. But if your lab doesn't have that facility, you can take contacts using copper wire and conducting silver paste.
If you find difficulty using silver paste, one more option is to make wire contacts using indium.
The best way to electrically access you solar cell specimens safely is to glue the cell to a PCB by an appropriate adhesive epoxy and then connect the electrodes by silver epoxy and and soldered copper wires to two soldering copper pads shaped on the PCB. So, prepare and shape the PCB with the two cupper Pads. Then glue the solar cell on the PCB. Coat the silver epoxy on the access point on the electrodes of the solar cells. Immerse two tin coated cupper wires on the silver epoxy spots. Wait tell drying silver epoxy and then solder the two wires on the solder pads on the PCB. Now you can access safely the solar cells from the solder pads on the PCB.
Best wishes
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