Growth, structural, optical and electronic transport properties of tetragonal CH3NH3SnBr3 perovskite single crystals†
Abstract
The structural and electronic transport properties of tetragonal CH3NH3SnBr3 single crystals (T-MASnBr3 SCs) are rarely reported. In this study, we synthesized T-MASnBr3 single crystals by volatilizing DMF solvent at room temperature. The crystal system and space group of the T-MASnBr3 SC are tetragonal and P4/mmm, respectively. In addition, the nitrogen atom in the methylamine group exhibits position disorder. The band gap of the T-MASnBr3 SC was determined to be 2.07 eV using the Tauc plot. Six fluorescence peaks and a lifetime up to 10 microseconds were observed in the steady-state fluorescence spectra and time-resolved fluorescence spectra of the T-MASnBr3 SC, respectively. The carrier mobility (electron) of T-MASnBr3 was 321 cm2 V−1 s−1. The curve of ln(square resistance) against T−1 was a straight line. The value of the activation energy (Ea) was 5421 J mol−1. The stability of the T-MASnBr3 SC was good before 473 K. The results indicate that T-MASnBr3 SCs have promising applications in the field of temperature sensors.