Parameters Affecting I – V Hysteresis of CH 3 NH 3 PbI 3 Perovskite Solar Cells: Effects of Perovskite Crystal Size and Mesoporous TiO 2 Layer

Current-voltage (I-V) characteristics of CH3NH3PbI3 perovskite solar cells are studied using a time-dependent current response with stepwise sweeping of the bias voltage. Compared with the crystalline Si solar cell showing time-independent current at a given bias voltage, the perovskite solar cells exhibit time-dependent current response. The current increases with time and becomes steady at forward scan from short-circuit to open-circuit, whereas it is decayed and saturated with time at reverse scan from open-circuit to short-circuit. Time-dependent current response eventually leads to I-V hysteresis depending on the scan direction and the scan rate. Crystal size of CH3NH3PbI3 and the mesoporous TiO2…

• NR
  National Research Foundation of Korea

  Awards: NRF-2012M1A2A2671721, NRF-2012M3A7B4049986, NRF-2010-0014992