Place the ITO Patterned substrates in a rack to start the cleaning process.
Mix a small amount of Hellmanex with boiling water.
Sonicate for 10 minutes.
The substrates should then be sonicated in DI water, followed by IPA, each for 10 minutes.
When cleaning is finished dry the substrates with a nitrogen gun.
15 minutes UV Ozone treatment after cleaning will improve solution wetting.
The hole transport layer can then be deposited - here we are using PEDOT:PSS. This should first be filtered using a hydrophilic filter.
PEDOT:PSS can be spin coated onto the ITO substrates to form a layer of approximately 30nm. The film should then be annealed at around 110°C.
To expose the ITO strip, swab the HTL with an appropriate solvent, such as methanol.
Store the substrates and then transfer them to a glove box.
The active layer can be spin coated onto the PEDOT:PSS.
At this point either an OPV or OLED can be manufactured by changing the solution used. We are using a non-fullerene based mixture.
After spin coating, the active layer should be annealed.
The ITO can be exposed by swabbing with an appropriate solvent, such as chlorobenzene.
The electron transport layer can be deposited by spin coating or through evaporation.
After swabbing we will now deposit the cathode through metal evaporation.
Fill the Ossila evaporation mask with devices (active layer face down).
Transfer the mask into a thermal evaporator and run the evaporation.
After evaporation, substrates can be encapsulated to improve stability.
To encapsulate, add a drop of Ossila encapsulation epoxy and top with a glass slide.
This should then be cured under a UV lamp. At 365nm curing takes 15 minutes.
Your devices are now finished and ready to be tested.
This can be done using Ossila’s I-V Solar Cell Test System. This product comes in two models: Manual and Automatic.
The cell is placed with the active part facing down and topped with an illumination mask.
We then turn the solar simulator on.
The measurement can be set up using the free I-V Curve software which automatically calculates solar cell properties.
The JV sweeps can be observed in real time.
Once complete, the results are displayed on the right.