Efficient, stable and scalable perovskite solar cells

Abstract

Since 2009, the power conversion efficiencies (PCE) of perovskite solar cells (PSCs) have increased from 3.8% to 25.8% over the last decade. Most highly efficient PSCs employ an n-type layer of mesoporous titanium dioxide or tin oxide in an n-i-p device configuration, where organic/polymer conductors are commonly used to transport holes into a neighboring metal. Numerous efforts have thus far been devoted to achieving a defect-free perovskite film with high-quality morphologies for achieving reduced loss-in-potential results and increased efficiency levels. These comprehensive advances in interface engineering, composition engineering, and charge-transporting layer engineering for perovskite solar cells allow us to attain a PCE greater than 25%. In this talk, I will discuss our recent advances and our understanding of the limitations to further enhancing photovoltaic performance.1,2 Particularly, I will discuss a rational interface design at the interface of the perovskite and the HTM that would result in the effective passivation of surface defects, a favorable energy-level alignment for facilitating hole extraction, and robust interfacial contact against environmental stimuli, thereby enhancing the efficiency and stability of perovskite solar cells.3 I will also present new dual-functional ionic liquids (ILs) based on alkylammonium bis(trifluoromethane)sulfonamide as a dopant in the hole transporting layer.4 Finally, I will discuss our efforts to produce PSCs in an eco-friendly and scalable manner.5,6