Binary metal zinc-lead perovskite built-in air ambient: Towards lead-less and stable perovskite materials

摘要

Organo-metal halide perovskites are promising new-generation photovoltaic materials owing to their efficient electrical/optical characteristics. Despite having high efficiency, perovskites are toxic due to the presence of lead and instable in air ambient. Therefore, the toxicity and instability call for more efforts in this area. Here, methylammonium-zinc-lead iodide (MAZn(0.2)Pb(0.8)I(3)) is synthesized in air ambient as lead-less and more stable perovskite material for applying as the active layer of solar cells. 1.65 eV optical band gap and 51 nm minority carrier diffusion length (L-diff) have been obtained with the help of UV-Visible spectroscopy (UV-Vis) and steady-state photocarrier grating (SSPG) technique respectively. Structural, chemical bonding and surface studies are done by X-ray powder diffraction (XRPD), Fourier-transform infrared spectroscopy (FTIR) and Field Emission Scanning Electron Microscope (FESEM) respectively. The sample has been stored in dark air ambient with average relative humidity of 45% at room temperature (27 degrees C) for 60 days and the properties of 60 days aged sample is investigated and compared with characteristics of 60 days aged MAPbI(3). The results confirm MAZn(0.2)Pb(0.8)I(3) is more stable than MAPbI(3).