ZrO2/TiO2 Electron Collection Layer for Efficient Meso-Superstructured Hybrid Perovskite Solar Cells.
Since the first reports of efficient organic-inorganic perovskite solar cells in 2012, an explosion of research activity has emerged around the world, which has led to a rise in the power conversion efficiencies (PCEs) to over 20%. Despite the impressive efficiency, a key area of the device which remains suboptimal is the electron extraction layer and its interface with the photoactive perovskite. Here, we implement an electron collection "bilayer" composed of a thin layer of zirconia coated with titania, sitting upon the transparent conductive oxide fluorine-doped tin oxide (FTO). With this double collection layer we have reached up to 17.9% power conversion efficiency, delivering a stabilized power output (SPO) of 17.0%, measured under simulated AM 1.5 sunlight of 100 mW cm-2 irradiance. Finally, we propose a mechanism of the charge transfer processes within the fabricated architectures in order to explain the obtained performance of the devices.
['Mejía Escobar|Mario Alejandro|MA|http://orcid.org/0000-0001-7093-7964', 'Pathak|Sandeep|S|', 'Liu|Jiewei|J|', 'Snaith|Henry J|HJ|', 'Jaramillo|Franklin|F|http://orcid.org/0000-0003-1722-5487']
electron collection layer perovskite solar cell anomalous hysteresis atomic force microscopy pinholes