Over 6% MAPbBr3 perovskite solar cells employing organic contacts

Nadja Giesbrecht^a, Pablo Docampo^a

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, Pablo Docampo, 201
Publication date: 5th February 2015

Perovskite solar cells have recently emerged as an attractive alternative photovoltaic technology with solar power conversion efficiencies already surpassing 20 %. This family of materials is easily solution processable, requiring only low-cost materials and is compatible with large scale printing techniques. This makes them suitable for immediate implementation for large scale applications in a tandem configuration with a lower bandgap solar cell as the bottom cell. In particular wider bandgaps than the standard Iodide perovskite compounds need to be targeted to maximize the efficiency in the tandem. Recently methylammonium lead bromide (MAPbBr₃) has been explored as a single junction material in a configuration there the holes are extracted from the top contact and electrons from the bottom contact. However, in order to incorporate these films into a suitable monolithic tandem configuration with typical commercially available solar cells such as CIGS or c-Si, this configuration needs to be inverted. Here we have developed inverted MAPbBr3 solar cells with PEDOT:PSS and PCBM as the charge extracting contacts. We explore several deposition techniques and correlate structural characteristics with the photophysical and photovoltaic performance. We have achieved solar cells over 6.3 % which are competitive with the state-of-the-art devices based on mesoporous TiO₂ and spiro-OMeTAD. Our results help to elucidate the requirements in terms of structural properties to achieve high efficiency devices in general and help bring this technology one step closer to commercial realization.

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