Abstract
Abstract
An oriented TiO2 nanocrystal array (TiO2-NA) shows a unique electron extraction capability for perovskite solar cells (PSCs) due to it having fewer grain boundaries and high crystallinity for effective charge collection. Based on these advantages, we prepared PSCs based on TiO2-NA mesoporous film (mp-film), and chose CdO quantum dots (QDs) as the modifier of the TiO2-NA mp-film. The diameter of a single TiO2-NA and the TiO2-NA gap were controlled by controlling the hydrothermal reaction time. The CdO-QDs/TiO2-NA mp-film, as the electron transporting layer (ETL), was prepared by successive ionic layer adsorption and the reaction-sintering method. In this work, oxidation state CdO QDs were first used as the modifier in the ETL of the PSC. We gradually optimized the CdO/TiO2-NA mp-film by controlling the hydrothermal reaction time of TiO2-NA to improve PSC performance. Infiltration of the perovskite absorber–submicrometer-thick rutile TiO2-NA mp-films with Spiro-MeOTAD yielded a strikingly high photoelectric conversion efficiency of 11.94% under AM 1.5G illumination. The dependence of photovoltaic performance and interfacial electronic behavior on the length of the CdO/TiO2-NA was also investigated.
Subject
Materials Chemistry,Electrical and Electronic Engineering,Condensed Matter Physics,Electronic, Optical and Magnetic Materials