Heterojunction Modification for Highly Efficient Organic–Inorganic Perovskite Solar Cells

Organic-inorganic perovskites, such as CH3NH3PbX3 (X=I, Br, Cl), have emerged as attractive absorber materials for the fabrication of low cost high efficiency solar cells. Over the last 3 years, there has been an exceptional rise in power conversion efficiencies (PCEs), demonstrating the outstanding potential of these perovskite materials. However, in most device architectures, including the simplest thin-film planar structure, a current-voltage response displays an "anomalous hysteresis", whereby the power output of the cell varies with measurement time, direction and light exposure or bias history. Here we provide insight into the physical processes occurring at the interface between the n-type charge…

• AR
  Advanced Research Projects Agency - Energy

  Award: DE-AC36-08GO28308
• EA
  Engineering and Physical Sciences Research Council

  Award: EP/F065884/1
• OO
  Office of Naval Research

  Award: N00014-11-1-0300