Efficient planar heterojunction perovskite solar cells based on formamidinium lead bromide

Hanusch, F. C. et al. (2014) Efficient planar heterojunction perovskite solar cells based on formamidinium lead bromide. Journal of Physical Chemistry Letters, 5(16), pp. 2791-2795. (doi: 10.1021/jz501237m) (PMID:26278080)

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The development of medium-bandgap solar cell absorber materials is of interest for the design of devices such as tandem solar cells and building-integrated photovoltaics. The recently developed perovskite solar cells can be suitable candidates for these applications. At present, wide bandgap alkylammonium lead bromide perovskite absorbers require a high-temperature sintered mesoporous TiO2 photoanode in order to function efficiently, which makes them unsuitable for some of the above applications. Here, we present for the first time highly efficient wide bandgap planar heterojunction solar cells based on the structurally related formamidinium lead bromide. We show that this material exhibits much longer diffusion lengths of the photoexcited species than its methylammonium counterpart. This results in planar heterojunction solar cells exhibiting power conversion efficiencies approaching 7%. Hence, formamidinium lead bromide is a strong candidate as a wide bandgap absorber in perovskite solar cells.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Docampo, Dr Pablo
Authors: Hanusch, F. C., Wiesenmayer, E., Mankel, E., Binek, A., Angloher, P., Fraunhofer, C., Giesbrecht, N., Feckl, J. M., Jaegermann, W., Johrendt, D., Bein, T., and Docampo, P.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Physical Chemistry Letters
Publisher:American Chemical Society
ISSN (Online):1948-7185
Published Online:04 August 2014

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