Highly efficient planar perovskite solar cells through band alignment engineering

  title={Highly efficient planar perovskite solar cells through band alignment engineering},
  author={Juan Pablo Correa Baena and Ludmilla Steier and Wolfgang R. Tress and Michael Saliba and Stefanie Neutzner and Stefanie Neutzner and Taisuke Matsui and Fabrizio Giordano and T. Jesper Jacobsson and Ajay Ram Srimath Kandada and Shaik Mohammed Zakeeruddin and Annamaria Petrozza and Antonio Abate and Mohammad Khaja Nazeeruddin and Michael Gr{\"a}tzel and Anders Hagfeldt},
  journal={Energy and Environmental Science},
The simplification of perovskite solar cells (PSCs), by replacing the mesoporous electron selective layer (ESL) with a planar one, is advantageous for large-scale manufacturing. PSCs with a planar TiO2 ESL have been demonstrated, but these exhibit unstabilized power conversion efficiencies (PCEs). Herein we show that planar PSCs using TiO2 are inherently limited due to conduction band misalignment and demonstrate, with a variety of characterization techniques, for the first time that SnO2… 

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