Efficient planar heterojunction perovskite solar cells based on formamidinium lead bromide

Fabian C. Hanusch, Erwin Wiesenmayer, Eric Mankel, Andreas Binek, Philipp Angloher, Christina Fraunhofer, Nadja Giesbrecht, Johann M. Feckl, Wolfram Jaegermann, Dirk Johrendt, Thomas Bein, Pablo Docampo

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254 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2791-2795
Number of pages5
JournalJournal of Physical Chemistry Letters
Issue number16
Publication statusPublished - 24 Jul 2014
Externally publishedYes


  • crystal structure
  • formamidinium lead bromide
  • planar heterojunction
  • wide bandgap perovskite

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