TiO<sub>2</sub>-Assisted Halide Ion Segregation in Mixed Halide Perovskite Films
Jeffrey T. DuBose, Prashant V. Kamat
Abstract
causes hole accumulation in the MHP film. Localization of holes on the iodide site in the MHP induces instability causing iodide from the lattice to move away toward grain boundaries. Suppression of segregation occurs when holes are extracted by a hole transport layer (spiro-OMeTAD) deposited on the MHP, thus avoiding hole build-up. These results provide further insight into the role of holes in the phase segregation of MHPs and hole mobility in perovskite solar cells.
Topics & Concepts
HalideIodidePerovskite (structure)ChemistryElectronExcited stateIonElectron mobilityGrain boundaryInorganic chemistryPhotochemistryCrystallographyOptoelectronicsMaterials scienceAtomic physicsMicrostructurePhysicsQuantum mechanicsOrganic chemistryPerovskite Materials and ApplicationsSolid-state spectroscopy and crystallographyChalcogenide Semiconductor Thin Films