Metal free composite hole conductor-counter electrode layer for perovskite solar cells based on carbon nanotubes and drop-cast hole conductor

Gerrit Boschloo^a, Kerttu Aitola^a, Kári Sveinbjörnsson^a, Erik Johansson^a, Anders Hagfeldt^b, Dongqin Bi^b, Nick Vlachopoulos^b, Esko Kauppinen^c, Antti Kaskela^c

^aUppsala University, Sweden, Uppsala, Sweden

^bEcole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

^cAalto University School of Science, P.O.Box 15100, Aalto, 00076, Finland

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Kerttu Aitola, 373
Publication date: 5th February 2015

We present a novel method for manufacturing a metal-free composite hole transport material-counter electrode (HTM-CE) layer for methylammonium lead iodide perovskite solar cells. The composite layer was prepared by drop-casting the HTM solution, 2,2',7,7'-Tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (Spiro-OMeTAD) in chlorobenzene, through a single-walled carbon nanotube (SWCNT) film deposited directly on the perovskite layer. The SWCNT film was prepared by aerosol chemical vapor deposition, collected on a filter paper from the gas phase, and attached on the perovskite layer by press-transfer. The above described configuration was compared with two other ones: spin-coating the Spiro-OMeTAD solution on the perovskite layer and depositing the SWCNT film on it and using the SWCNT film as both the HTM and the CE. We found out that drop-casting the HTM solution through the SWCNT film yielded the best solar cell performance, which was also comparable to that of the reference solar cell with spin-coated HTM and evaporated silver CE. One spin-coating step of the cell preparation could thus be completely omitted, making the cell manufacturing more suitable for industrial upscaling. The good performance of the HTM-CE layer was related to the fact that the SWCNT film is a good selective contact for holes and also a good hole transporting material [1]. The observation paves a way for upscalable, stable, flexible and transparent (with the possibility of varying the SWCNT film transparency by adjusting e.g. the individual SWCNT thickness) perovskite solar cells.

[1] Habisreutinger, S.; Leijtens, T.; Eperon, G.; Stranks, S.; Nicholas, R.; Snaith, H. Carbon Nanotube/Polymer Composites as a Highly Stable Hole Collection Layer in Perovskite Solar Cells. Nano Letters 2014, 14, 5561-5568.

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