Is there any fool-proof, rookie-friendly tips to fabricate a carbon electrode, hole-transport free perovskite solar cell that is not prone to short circuit? I tried one step spin coating with anti-solvent (4000 rpm 25 s, static spin-coating, 10 s drop ethyl acetate) and out of 10 devices only 2 showed results, and they are not even the same. The reproducibility is unacceptable. The carbon paste is doctor-bladed directly on perovskite using chlorobenzene/PMMA solvent. Active area is 0.28 cm2 (6 mm hole at the center of spin coating using kapton tape).
Should i consider changing to two-step spin coating? I was thinking that there might be pin-holes not observable by naked eye and two-step might reduce the number of pin holes. Suggestions are desperately needed. Thank you very much.
Cheng, N., Liu, P., Qi, F., Xiao, Y., Yu, W., Yu, Z., Liu, W., Guo, S.S. and Zhao, X.Z., 2016. Multi-walled carbon nanotubes act as charge transport channel to boost the efficiency of hole transport material free perovskite solar cells. Journal of Power Sources, 332, pp.24-29.
Hi. This paper may be useful. Initially, PbI2 and PbBr2 were thermally coevaporated on top of the graphene layer. In a second step the perovskite layer was formed by spin‐coating a mixture of HC(NH2)2I and CH3NH3Br, which was followed by a short annealing step at 100 °C. This is the only technique we managed to reproducibly deposit high-quality hybrid perovskite films on chemically vapor deposited graphene. Most likely this approach may also work for you.
Article Doping Effects and Charge-Transfer Dynamics at Hybrid Perovs...
Azeez Abdullah Barzinjy very sorry i forgot to reply to your answer, Thank you Azeez Abdullah Barzinjy and Viktor Brus for your suggestions.
After some testing in the lab I found out the Vacuum Flash-Assisted Solution Process (VASP) produced functional spacer layer-free perovskite device with carbon paste electrode without short circuit. I highly recommend this method for future visitors of this question as it produced pin-holes free film over large area, in my case 1 cm2 and it is still functioning. What i used to achieve high vacuum condition very quickly is by spin-coating the precursor first for less than 5 s, transfer it to the small antechamber of Glovebox before it turned turbid and vacuum it quickly to -10MPa for 10 s - 20 s. The annealed film showed mirror-like appearance comparable with the antisolvent dripping method.
Reference: Li, X., Bi, D., Yi, C., Décoppet, J.-D., Luo, J., Zakeeruddin, S.M., Hagfeldt, A., Grätzel, M., 2016. A vacuum flash–assisted solution process for high-efficiency large-area perovskite solar cells. Science (80-. ). 353, 58–62.
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nanostructures
- Thin Films