1. Load and purge

Push the syringe to the maximum, dip the tip in your electrolyte, and gently release the spring in order to take up about 0.5 mL of solution.

Place the syringe tip upright and press the cylinder until no air or bubbles remain in the electrolyte solution (use a tissue to absorb excess of liquid). Hold this position for the next step so that air doesn’t get back into the syringe.

2. Vacuum, wait

Keeping the cylinder compressed, apply the red rubber tip to the electrode hole.

Slowly release the spring. The resulting suction creates a vacuum in the solar cell’s cavity, which may be visible by the evolution of bubbles through the reservoir of electrolyte.

Hold this position for a few seconds, allowing the air to leave the inside of the cell.

3. Fill, release

Once the air is removed from the cell, slowly press the syringe down. The pressure on the electrolyte and the vacuum in the cell’s cavity pushes and pulls the liquid inside the solar cell.

Press the spring down until the entire cavity is filled with electrolyte. This technique leaves almost no bubbles between the two electrodes. Repeat the vacuum/fill cycle if necessary.

Continue to depress the syringe while removing the suction tip from the electrode hole. Don’t release the syringe’s spring before the tip is off the glass to prevent drawing the electrolyte out.

Voila! Your solar cell is filled with electrolyte, just seal the hole and it’s ready to go.