10:00 AM - 10:15 AM
▲ [23a-B103-5] A-site cationic doping for thermal stability enhancement in tin-lead based perovskite solar cells
Keywords:Perovskite solar cells, Tin-lead perovskites, Doping engineering
Tin-lead (SnPb) perovskite solar cells (PSCs) have been studied attentively due to their promising performance and tunable electronic and optical properties that of in-between the tin and the lead perovskites. In this study, we employed various cationic dopants from alkali metal group as a doping agent into the precursor of the SnPb perovskite material. The effects of addition of dopants targeting A-site constituent for the intermediate phase formation in order to stabilize the structural lattice of the tin-lead perovskite upon heating were studied via FE-SEM imaging, XRD structural studies, XPS elemental characterization, PL-TRPL carrier lifetime measurement, UV-Vis absorption spectroscopy and PYS energy level of the perovskite materials. From series of the investigations, we managed to achieve SnPb based PSCs with the highest efficiency of more than 21% and demonstrated high photo and thermal stability when alkali metal cations were incorporated. The SnPb PSCs which was stored in the nitrogen filled air are able to retain about 99% of their efficiencies after 1 month of storage. In term of thermal stability, the PSCs are able to retain more than 75% of their initial efficiencies after subjected to the temperature over 85 °C for 150hrs in nitrogen atmosphere. We conclude this research by proving the performance and the stability of the SnPb based PSCs will be enhanced by integrating alkali metal halide dopants.