The Surface Chemistry and Interfacial Dynamics of Inorganic Perovskite Solar Cells

The stability of perovskite solar cells made of inorganic CsPbI3 is impressive, but the power conversion efficiency still needs improvement due to high open circuit loss (V-loss). ((1,2)) This issue is often attributed to a mismatch in energy levels between the inorganic perovskite layer and the charge-selective contacts at the interface. ((3)) Therefore, it is essential to understand the interface dynamics in these solar cells. Despite significant efforts since 2015 to address CsPbI3 crystallisation and phase stability at operational temperatures, ((4-6)) a more comprehensive understanding of the interface is necessary to advance CsPbI3-based devices. We focus on presenting a detailed surface chemistry and interfacial dynamics analysis using spectroscopic and optical techniques. In this talk, we will have a comprehensive discussion on the effects of the annealing environment on the intrinsic properties of the interface. Additionally, we will discuss the implementation of interface engineering using dipole molecules to mitigate V-loss to improve the efficiency of solar cell devices.