| 초록 |
Perovskites have superior optoelectronic properties but the commercialization of perovskite solar cells (PSCs) remains an obstacle due to the toxicity of lead. Tin-based perovskites are considered as the most viable candidates to replace the lead-based perovskites, but tin-based perovskites have severe deficiencies, including the facile oxidation of Sn2+. To overcome the disadvantages, recent studies have combined tin with lead to improve the oxidative stability, but tin-lead hybrid perovskites also oxidizes in a few hours upon exposure to ambient air. Here, we introduced a simple Ag doping method for increasing oxidative stability of tin-lead hybrid PSCs. Ag doping increases the grain size and reduces the thickness of amorphous intergranular films, thereby inhibiting the infiltration of oxygen into the perovskite crystals. A density functional theory (DFT) simulation revealed that Ag doping increases the energy barrier to the adsorption of oxygen onto the perovskite surface. |
