Improving the fatigue resistance of flexible perovskite solar cells by replacing the metal oxide electrode

Timothy L. Kelly^a, Kianoosh Poorkazem^a, Dianyi Liu^a

^aUniversity of Saskatchewan, 110 Science Place, Saskatoon, S7N5C9

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, Kianoosh Poorkazem, 294
Publication date: 5th February 2015

Flexible perovskite solar cells have previously been fabricated on plastic substrates;^[1] however, the majority of them contain an expensive and relatively inflexible^[2] indium tin oxide front electrode. This electrode is not mechanically robust and begins to fail after relatively few bending cycles, which limits its utility in some flexible-device applications. In this poster, we have replaced this metal oxide electrode with a layer of highly conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS).^[3]The use of this polymer makes it possible to fabricate a perovskite solar cell with an organic transparent electrode and organic interfacial layers, and as a result, a device whose flexibility is limited by the perovskite layer itself. This flexibility is evaluated by comparing the fatigue resistance of the perovskite devices (obtained from monitoring the efficiency during 2000 bending cycles of a radius of curvature of 4 mm) with that of all-organic solar cells. Eventually, we make comments on possible flexible applications of the fabricated devices.
PEDOT electrode for a flexible perovskite solar cell.
[1] Liu, D.; Kelly, T. L. Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques. Nat. Photonics 2014, 8, 133-138. [2] Inganas, O. Organic photovoltaics: Avoiding indium. Nat. Photonics 2011, 5, 201-202. [3] Poorkazem, K.; Liu, D.; Kelly, T. L. Fatigue resistance of a flexible, efficient, and metal oxide-free perovskite solar cell. J. Mater. Chem. A 2015, DOI: 10.1039/C5TA00084J.

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