Journal
JOURNAL OF APPLIED PHYSICS
Volume 122, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4989838
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Multi-quantum well organic-inorganic perovskites offer an approach to tunable exciton binding energies based on well-barrier dielectric mismatches, that is, the image-charge effect. As with other two-dimensional materials, ultrathin exfoliated perovskites are highly sensitive to their dielectric environments. We investigate ultrathin crystalline two-dimensional van der Waals layers of organic-inorganic perovskite crystals adjacent to the surface of a substrate. The exciton binding energies are strongly influenced by the surrounding dielectric environment. The Keldysh model describes this dependence. We compare our binding-energy results with data in the (C6H13NH3)(2)PbI4 perovskite and estimate binding-energy values for (C4H9NH3)(2)PbBr4. Published by AIP Publishing.
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