Photoinduced Energy Level Realignment at Interfaces between Organic Semiconductors and Metal Halide Perovskites
Zu, F., Warby, J.H., Stolterfoht, M., Li, J., Shin, D., Unger, E., Koch, N.
2021HZB Repository (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB))14 citationsOpen Access PDF
Abstract
In contrast to the common conception that the interfacial energy level alignment is affixed once the interface is formed, we demonstrate that heterojunctions between organic semiconductors and metal halide perovskites exhibit huge energy level realignment during photoexcitation. Importantly, the photoinduced level shifts occur in the organic component, including the first molecular layer in direct contact with the perovskite. This is caused by charge carrier accumulation within the organic semiconductor under illumination and the weak electronic coupling between the junction components
Topics & Concepts
PhotoexcitationMaterials scienceHalideHeterojunctionOrganic semiconductorPerovskite (structure)SemiconductorOptoelectronicsMetalCharge carrierPhotoinduced charge separationChemical physicsPhotocatalysisInorganic chemistryAtomic physicsChemistryExcited stateCrystallographyPhysicsMetallurgyCatalysisBiochemistryArtificial photosynthesisPerovskite Materials and ApplicationsQuantum Dots Synthesis And PropertiesConducting polymers and applications