Effect of Cation Rotation on Charge Dynamics in Hybrid Lead Halide Perovskites

• DOI: 10.1021/acs.jpcc.6b06722
• Publication Date: 2016-07-11T15:27:01Z
• Authors: María C. Gélvez-R...; Duyen H. Cao; Sameer Patwardhan; Nicolas Renaud; Constantinos C. S...; George C. Schatz; Joseph T. Hupp; Omar K. Farha; Tom J. Savenije; Mercouri G. Kanat...; Ferdinand C. Grozema
• Keywords: Charge carrier; Orthorhombic crystal system; Tetragonal crystal system; Electron Mobility

Organic–inorganic hybrid halide perovskites are a promising class of materials for photovoltaic application with reported power efficiencies over ∼22%. However, not much is known about the influence organic dipole rotation and phase transitions on charge carrier dynamics. Here, we report substantial changes in mobility lifetime carriers CH3NH3PbI3 after low-temperature tetragonal (β) to orthorhombic (γ) transition. By using microwave conductivity measurements, observed that ionized increase as temperature decreases sudden increment seen β–γ For CH3NH3PbI3, half-lifetime by factor 3–6 compared values before We attribute considerable change dynamics at low decrease inherent dynamic disorder cation (CH3NH3+) inside perovskite crystal structure.