Photoinduced Energy-Level Realignment at Interfaces between Organic Semiconductors and Metal-Halide Perovskites
Fengshuo Zu, Jonathan H. Warby, Martin Stolterfoht, Jinzhao Li, Dongguen Shin, Eva Unger, Norbert Koch
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
Organic semiconductorMaterials scienceHeterojunctionSemiconductorOptoelectronicsLayer (electronics)Coupling (piping)Interface (matter)Chemical physicsSemiconductor materialsPhotoinduced charge separationOrganic moleculesVisible spectrumCondensed matter physicsOrganic electronicsPerovskite Materials and ApplicationsElectronic and Structural Properties of OxidesOrganic Electronics and Photovoltaics