Month: June 2023

Quasi-two-dimensional (2D) Pb–Sn mixed perovskites show great potential in applications of single and tandem photovoltaic devices, but they suffer from low efficiencies due to the existence of horizontal 2D phases. Here, we obtain a record high efficiency of 18.06% based on 2D ⟨n⟩ = 5 Pb–Sn mixed perovskites (iso-BA₂MA₄(Pb_xSn_1–x)₅I₁₆, x = 0.7), by optimizing the crystal orientation through a regulation of the Pb/Sn ratio.… Read More