In the beginning of the project,
I was very confident, that the transformation and the development of perovskites
into a printable solution could be achieved relatively easy. However, this turned out to be more difficult.
Especially in the second year of the project because we had to realise, that all previous results produced, had been made on small size perovskite sollar cells. These was not easily transferable
to larges substrates, as we had thought and
planned to work on 15 cm x 15 cm perovskite solar cells. Because of this, we could also
not use the processes that had been developed
in the community at that time or any previous results
by any of the consortium partners. Especially, the so-called anti-solvent step A new anti-solvent step had to be developed
and we had to find a new way to develop an anti-solvent step
for the production of printable solar cells of this size. This was the main point and we are now,
at the very end of the project, at a point, where we can say: Yes, we now know how this is to be done and frankly, we would need
a quarter- of half a year more to finish the developing cycle,
and reach the point where we can say, yes now we know exactly how to print a larger area of perovskite with the right quality, meaning with the right morphology the right setting of the perovskite crystal structure on the large-scale area. What we also wanted to achieve was to be able to print different sizes of single solar cells.